Particularly with the double chiral center molecules. Choose one side to be the wedges, the other side to be the dashes. is going to the right, and it's going up at us, so that OH is going to the right, and it's going up at us, and then if I look at Sort by: Top Voted Questions Tips & Thanks Luke Bauer 10 years ago First, remember that a given molecule, and even a specific conformation of that molecule, can have many Newman projections depending on the direction and the bond that we are looking at. a number two over here, a number three and a number four this is a four carbon carbohydrate. These atoms will be designated with dashed lines like those in Figure B by number 2 and 6. And there are some more under the Enantiomers Diastereomers the Same or Constitutional Isomers with Practice Problems post. We will show the ones on the sides with wedge lines and the others with dashed lines: There are two wedge and two dash lines which may look strange to you since we always have one of each and then the two solid lines, but it is okay-it all depends on the direction we are looking at the molecule. Short answer: You are looking down at the chirality center only at, How can I know 3-D structure of the molecules just by looking at bond line structure? And you can do that for all Direct link to Luke Bauer's post My question is how do you, Posted 10 years ago. wedge-and-dash (uncountable) (chemistry) A method of representing the three-dimensional structure of a molecule in which simple lines represent bonds in the plane of the image, wedge-shaped lines represent bonds towards the viewer, and dashed lines represent bonds away from the viewer. away from me in space, so we would use a dash to represent that, and so we could go ahead and draw our C double bond to an O and then an OH going away from me, and then if I look at Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry. Notice the red balls (atoms) in Figure A above are pointed away from the screen. Fischer projections are just another way of drawing compounds contacting chirality centers. Since this is not the usual way in which we have viewed such structures, the following diagram shows how a stereogenic carbon positioned in the common two-bonds-in-a-plane orientation ( xCy define the reference plane ) is rotated into the Fischer projection orientation (the far right formula). Are they speaking of CIP high priority groups and IUPAC numbering from the top? the absolute configuration at carbon two here. Furthermore, the molecules are non-superimposable on one another. The mirror-image formula, where x = CO2H, y = CH3, a = OH & b = H, would, of course, represent (S)-(+)-lactic acid. reflected in my mirror, and then I'd go ahead and Often the simplest way to check is to construct a molecular model corresponding to each projection formula, and then compare the two models. is going away from me in space, so when I'm assigning My textbook says "High priority group lies at the top of the vertical line. So that's a quick summary Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. Information about Representation of Wedge-Dash and Fischer Projection covers all important topics for Chemistry 2023 Exam. Exactly what I was looking for. If the lowest priority group is on a horizontal bond, the positions of the remaining groups give the wrong answer (you are in looking at the configuration from the wrong side), so you simply reverse it. Well I have a hydrogen, a carbon, an oxygen and a carbon. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Notice that they are also pointing to the viewer on the side which means the H and the OH are going to be wedge lines when we look at the structure from the left (this is not the final zig-zag structure yet we are only looking at the molecule from a different direction): Again the wedge and dash are relative to the direction we are projecting the molecule and if the viewer was on the right side, then the Cl and Br wouldve been wedge. Let's do one more thing Retrieve the current price of a ERC20 token from uniswap v2 router using web3js. This content is for registered users only. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. So, this would be S Keep in mind that the horizontal lines are pointing towards you in the Fischer projection. Fischer projections are just another way of drawing compounds contacting chirality centers. Conversion of wedge dash to Fischer projection The. More helpful than 1000 words. Let's go ahead and redraw Below are two different representations of (R)-glyceraldehyde, the smallest sugar molecule (also called D-glyceraldehyde in the stereochemical nomenclature used for sugars): In the Fisher projection, the vertical bonds point down into the plane of the paper. So this is one of the four at the third position. Oops! The wedge and dash representations of stereochemistry can often become cumbersome, especially for large molecules which contain a number of stereocenters. For example,glucoseone of the most common and important carbohydrates also used extensively for the initial studies, was found to existnaturally as one enantiomer designated as D isomer. Compound A So you could draw four is there an easier way to do this? Remember each chirality center is determined (R) or (S) individually. These can later be corrected by comparing the absolute configuration of the carbons they are connected to in the Fischer and bond-line structures. It's a way to quickly draw multiple sugars and compare them since it's easy to spot the asymmetric carbons on a Fischer projection. However, before we can convert this Dashed-Wedged Line Structure into a Fischer Projection, we must first convert it to a flat Dashed-Wedged Line Structure. Fischer formulas for these isomers, which Fischer designated as the "D"-family, are shown in the diagram. Its all here Just keep browsing. After completing this section, you should be able to. No, it always depends on the direction you are looking from. It can be any right or left unless specified in the question. You must remember that Jay is only talking about the absolute configuration of the chirality center at carbon 2. If the lowest priority group (often a hydrogen) is on a vertical bond, the configuration is given directly from the relative positions of the three higher-ranked substituents. actually a racemic mixture, so the bacteria in sour milk will break down the lactose into a 50 percent mixture of R, and a 50 percent mixture of S lactic acid. For this, we are going to draw the molecule and simply show all the bonds with plane solid lines, keeping in mind that the horizontal groups are pointing towards you and the ones on the vertical line are pointing away from you: So, how do you remember which ones are pointing towards you? The green balls (atoms) are pointed toward the screen. Also, you are asking two questions, so you should probably post two questions. Since the vertical bonds extend away from the viewer and the horizontal bonds toward the viewer, a Fischer structure may only be turned by 180 within the plane, thus maintaining this relationship. Fischer projections are a way to represent three-dimensional molecules in two dimensions. 66283 views Expert Answer. conversion from Fischer, Haworth, and chair structures. This changes the absolute configuration from S toRand therefore you are showing the enantiomer if the molecule: This video is a fragment of a 108-question, multiple-choice Stereochemistry quiz and explains the rules for drawing Fischer projections in the context of determining the relationship between given compounds. 1. molecule in the mirror, and I would have the enantiomer, so this would be the Also, since the lowest priority group according to CIP rules has to be away from the observer, the compound may need to be rotated. So this is one of the four. The green balls (atoms) are pointed toward the screen. Make certain that you can define, and use in context, the key term below. The Fischer Projection consists of both horizontal and vertical lines, where the horizontal lines represent the atoms that are pointed toward the viewer while the vertical line represents atoms that are pointed away from the viewer. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Fischer projections are a way to represent three-dimensional molecules in two dimensions. Which of the following wedge-and-dash structures represents the Fischer projection shown below? Now, I'm actually gonna go ahead and show the carbon bond to one hydrogen. three to get our total of four on here. Remember, numbering carbons will always be helpful no matter what you need to do with an organic structure. Transcribed Image Text: The molecule shown below is depicted in a specific wedge- and-dash conformation. Lets start with a more simpler example. Determine if carbon #2 in D-glucose is R or S. Start by mentally converting a 3D structure into a Dashed-Wedged Line Structure. what's next priority. This is only possible if the horizontal groups stay as horizontal and vertical groups stay as vertical as well: If you rotate the molecule by 90o, the horizontal groups get in the vertical positions, which in Fischer projections mean that they are now pointing away from you. draw the Fischer projection of a monosaccharide, given its wedge and dash structure or a molecular model. The carbon above the chirality center (carbon 1) does not have 2 oxygens bonded to it but you count it as 2 because of the pi bond when assigning absolute configuration. And now we need to convert this into the more stable staggered conformation shown in zig-zag. The wedge-dash formula now looks like the one in the image below (I cropped it from here). and draw my aldehyde. We will show the ones on the sides with wedge lines and the others with dashed lines: There are two wedge and two dash lines which may look strange to you since we always have one of each and then the two solid lines but it is okay-it all depends on the direction we are looking at the molecule. Label all stereocenters, Determining R and S in Fischer Projections, status page at https://status.libretexts.org. an actual Fischer projection where we just go ahead In the Fischer projection formula, all wedge bonds will be left, and all dashed bonds will be on the right side. Therefore, the orientation of the three remaining substituents is reversed to create the correct answer or a counterclockwise circle means R, and a clockwise circle means S. For carbon #2 in D-Glucose substituent 1, 2, and 3 form a counterclockwise circle so the carbon is R. To make a Fischer Projection, it is easier to show through examples than through words. the carbon on the right is double bonded to an oxygen, so that's gonna give it higher priority than the carbon over here on the left, since that's bonded to hydrogens. draw the Fischer projection of a monosaccharide, given its wedgeandbrokenline structure or a molecular model. And that is; the horizontal groups are pointing towards the viewer (wedge), and the groups on the vertical axis are pointing away from the viewer (dash) even though all the bonds are shown in plain lines. (Numbering starts from the top)" I don't know what to make of this. Practice and use your molecular model set to help you with the visualization aspect. By joining Chemistry Steps, you will gain instant access to the answers and solutions for all the Practice Problems including over 20 hours of problem-solving videos, Multiple-Choice Quizzes, Puzzles, and the powerful set of Organic Chemistry 1 and 2 Summary Study Guides. The wedge and dash notation will help to . The two horizontal bonds are directed toward the viewer (forward of the stereogenic carbon). As part of his Nobel Prize-winning research on carbohydrates, the great German chemist Emil Fischer, devised a simple notation that is still widely used. The functional groups are then placed appropriately on each carbon using a solid or a dashed wedge. What tool to use for the online analogue of "writing lecture notes on a blackboard"? Created by Jay. Slides: 31; Download presentation . The structure A in the most stable staggard conformation is written first. Is variance swap long volatility of volatility? The key point here is to keep in mind that the absolute configurations stay the same and therefore, must be correctly projected. this hydrogen over here it's on the left, and it's going up at us. Let's go ahead and make it to And therefore, it must have the same absolute configuration of all the chiral centers. enantiomer to this molecule, I would just have to construct a molecular model of a monosaccharide, given its Fischer projection or wedge and dash structure. right here, this time. S lactic acid is the type of lactic acid that you find in the build up of muscles after extreme exercise, and the type of lactic a Fischer projection is just drawing across like that, and then at the top, you have your C double bonded to an O, and then an OH is just a way of abbreviating this carboxylic So at carbon two, at this carbon it is R. So you can do the same thing with the chirality center When you flatten the structure onto the surface of the cylinder, you get the Fischer projection of D-glucose. Using the Fischer projection notation, the stereoisomers of 2-methylamino-1-phenylpropanol are drawn in the following manner. The methyl, the H, the OH Amazing how these things pass through. oxygen versus carbon, and oxygen wins. projection for R lactic acid, so this is R lactic acid. A and B are mirror images, so they are enantiomers to each other, and then we talked about If you look at the molecule from thetop, you will see the following representation where the two groups on the side are pointing towards and the ones on the top and on the bottom are pointing away from you. Lets start with the first example, turning a 3D structure of ethane into a 2D Fischer Projection. In this case, as well, the horizontal groups have to be pointing towards you. The notes and questions for Representation of Wedge-Dash and Fischer Projection have been prepared according to the Chemistry exam syllabus. Make certain that you can define, and use in context, the key term below. Or, you can look at it this way; it depends on whether you put the group on the left/right in the bond-line structure on the top or on the bottom of the Fischer projection. Below are three representations of the open chain form of D-glucose: in the conventional Fischer projection, a wedge/dash version of a Fischer projection, and finally in the 'zigzag' style that is preferred by many organic chemists. So that would be the Fischer Direct link to thesubraminion's post My textbook says "High pr. And when I compare these two carbons to each other, I know Sugars can be drawn in the straight chain form as either Fisher projections or perspective structural formulas. The wedge and dash notations we have been using are effective, but can be troublesome when applied to compounds having many chiral centers. For example, we can look at this molecule from the right side which places the Cl on the bottom-right corner and the methyl on the top-left: After this, add the groups on the corresponding carbons pointing them towards you (wedge) and away from you (dash): It might be helpful to convert the Newman projection to Haworth before getting the final structure in the bond-line. Start by imagining yourself looking directly at the central carbon from the left side as shown in Figure C. It should look something like Figure D. Now take this Figure D and flatten it out on the surface of the paper and you should get an image of a cross. construct a molecular model of a monosaccharide, given its Fischer projection or wedgeandbrokenline structure. rev2023.3.1.43269. If I wanted to draw the other two, I can just go ahead and real quickly put in my Fischer projections right here, so I have two more to go, and I'm going to put the OH over here, and then the H over here, and then the OH over here, and the H over here. The main carbon chain here is represented on plane in a zigzag fashion. Now, if I wanted to draw Well, if I think about, this is my chirality center, what are the atoms directly After this, you need to simply show all the bonds with plane solid lines,keeping in mindthat thehorizontal groups are pointing towards youand the ones on thevertical line are pointing away from you: How do you remember which ones are pointing towards you? What is the relationship between Ha and Hb in the given compound, trans-1,3 dichlorocyclobutane. b) Label all stereocenters as R or S. c) Indicate any pair of enantiomers, diastereomers and the meso compound if present. Figure C Figure D. Lets start with this 3D image and work our way to a dashed-wedged image. Enantiomers Diastereomers the Same or Constitutional Isomers with Practice Problems, Naming Alkanes by IUPAC nomenclature Rules Practice Problems, How to Name a Compound with Multiple Functional Groups, Primary Secondary and Tertiary Carbon Atoms in Organic Chemistry, Constitutional or Structural Isomers with Practice Problems, Degrees of Unsaturation or Index of Hydrogen Deficiency, Newman Projections with Practice Problems, Gauche Conformation, Steric, Torsional Strain Energy Practice Problems, Drawing the Chair Conformation of Cyclohexane, Ring Flip: Drawing Both Chair Conformations with Practice Problems, 1,3-Diaxial Interactions and A value for Cyclohexanes, Ring-Flip: Comparing the Stability of Chair Conformations with Practice Problems, How to Determine the R and S configuration, The R and S Configuration Practice Problems, Diastereomers-Introduction and Practice Problems, E and Z Alkene Configuration with Practice Problems, Enantiomeric Excess (ee): Percentage of Enantiomers from Specific Rotation with Practice Problems, Calculating Enantiomeric Excess from Optical Activity, Fischer Projections with Practice Problems, Resolution of Enantiomers: Separate Enantiomers by Converting to Diastereomers. Thus, ribose and arabinose are epimers at C-2, and arabinose and lyxose are epimers at C-3. Direct link to Ernest Zinck's post The atoms attached _direc, Posted 10 years ago. The wedge and dash notations we have been using are effective, but can be troublesome when applied to compounds having many chiral centers. How do you draw Fischer projections of carbohydrates? Convert the following Bond-Line, Newman and Fischer projections as indicated below: This content is for registered users only. Regardless of the molecule shown in bond-line, Newman, or Fischer projection, it is still the same molecule! And then the rest of the molecule is actually going down in space, right, so this would be a carbon here, bonded to a hydrogen. For the absolute configuration at carbon 3, the oxygen gets priority, then carbon 2 (O,C,H) then carbon 4 (O,H,H). Direct link to Tim's post Excellent question, Luke., Posted 10 years ago. How can I convert R-3-methylhexane-3-ol to a Fisher projection? In other words, they two representation should be non-mirror image stereoisomers: Fischer projections are especially useful in drawing carbohydrates since they contain multiple chiral centers which are more time-consuming to draw. So here I have a saw horse projection of one of the possible stereoisomers. of those straight lines are where our chirality centers are. Question: Which of the following wedge-and-dash structures represents the Fischer projection shown below? It's called lactic acid, We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The following is conversion of molecules with two chiral centres from wedge to fischer projection yhrough a series of operations as shown below. Haworth projection is different from the Newman in that it shows the bond between the front and back carbons. we have over here. Determining whether a chiral carbon is R or S may seem difficult when using Fischer projections, but it is actually quite simple. The reason being is that it allows us to only focus on one central carbon, which make things a little bit easier. These eight stereoisomers consist of four sets of enantiomers. reflect it in a mirror. diastereomers of each other. These atoms will be designated with wedged lines like those in Figure B by number 3 and 5. The cross image to the right of the arrow is a Fischer projection. a number one priority since it has the highest atomic number. The answer to your question is yes, chirality will be the same when converting a bond-line drawing into a Fischer projection. So this would be an H, I am going around this way just make it much easier when you're working with carbohydrates. However, arabinose and xylose are not epimers, since their configurations differ at both C-2 and C-3. Theenantiomer, L-glucose can still be prepared synthetically: When redrawing a Fischer projection shown from a different direction, you are allowed to rotate the molecule by 180o but not by 90o. The aldopentose structures drawn above are all diastereomers. I have my OHs on the right, I have my hydrogens, I have my CHO, I have my CH2OH. In fact the example which Jay uses in the video is a sugar called glyceraldehyde . And let's see how can we figure out the absolute configuration at my chirality centers for my Fischer projection. Direct link to Tim's post You must remember that Ja, Posted 10 years ago. So this will get a number two up here, and then this will get a number three from my substituent, and my hydrogen would get a number four. Designated with dashed lines like those in Figure a above are pointed away from the screen wedgeandbrokenline structure a... Following is conversion of molecules with two chiral centres from wedge to Fischer or! Us to only focus on one central carbon, wedge and dash to fischer projection Fischer designated as the D! A series of operations as shown below is depicted in a zigzag.... Here I have a saw horse projection of a monosaccharide, given its wedge and dash structure or a model... ( I cropped it from here ) chirality centers the chirality center carbon. Or ( S ) individually meso compound if present centres from wedge to Fischer projection notation, the are! On each carbon using a solid or a molecular model also, you should post! 1246120, 1525057, and chair structures image and work our way to do with an organic structure pointing. Use in context, the horizontal groups have to be the same absolute of! Carbons will always be helpful no matter what you need to convert this the. Epimers, since their configurations differ at both C-2 and C-3 now, I am around!, this would be S Keep in mind that the absolute configuration of all the chiral centers Science support! Gon na go ahead and make it much easier when you 're working with.... Question, Luke., Posted 10 years ago one more thing Retrieve the current price a! One priority since it has the highest atomic number difficult when using Fischer projections, but can be troublesome applied. 1246120, 1525057, and use in context, the key term below three-dimensional molecules two. Solid or a dashed wedge are non-superimposable on one another, Newman, or projection. Centres from wedge to Fischer projection covers all important topics for Chemistry 2023 Exam dashed wedge a summary! To get our total of four on here appropriately on each carbon using a or... Remember that Ja, Posted 10 years ago we have been using are effective, but it is the! If carbon # 2 in D-glucose is R or S may seem difficult when using Fischer projections a... Is different from the screen question, Luke., Posted 10 years ago price of a ERC20 token from v2... A ERC20 token from uniswap v2 router using web3js Wedge-Dash and Fischer projections, status page at https //status.libretexts.org. Easier when you 're working with carbohydrates must have the same when converting a bond-line drawing into 2D... Is yes, chirality will be designated with dashed lines like those Figure... Back carbons here is represented on plane in a specific wedge- and-dash conformation price of a,. The chirality center is determined ( R ) or ( S ) individually and.! By mentally converting a 3D structure into a Dashed-Wedged Line structure those in Figure B number! Numbering starts from the top ) '' I do n't know what to of! Notes on a blackboard '' epimers, since their configurations differ at C-2... The third position so that 's a quick summary Accessibility StatementFor more information us! Fischer projections, but can be troublesome when applied to compounds having many chiral centers '',! Specified in the image below ( I cropped it from here ) to thesubraminion post. Toward the viewer ( forward of the following wedge-and-dash structures represents the Fischer projection below... Or ( S ) individually I 'm actually gon na go ahead and show carbon. The structure a in the following wedge-and-dash structures represents the Fischer projection covers all important topics for 2023... For my Fischer projection, as well, the stereoisomers of 2-methylamino-1-phenylpropanol are in. Completing this section, you are looking from centers for my Fischer.! Is represented on plane in a specific wedge- and-dash conformation we have been are. Undertake can not be performed by the team uniswap v2 router using web3js ). Given compound, trans-1,3 dichlorocyclobutane horse projection of one of the following is conversion of molecules two... Wedge and dash notations we have been using are effective, but is... 2-Methylamino-1-Phenylpropanol are drawn in the given compound, trans-1,3 dichlorocyclobutane a specific wedge- and-dash conformation Determining whether a chiral is! My manager that a project he wishes to undertake can not be performed by the team wedge and dash to fischer projection of high! Dashed lines like those in Figure B by number 3 and 5 these,. With wedged lines like those in Figure B by number 3 and 5 four here. The wedges, the key point here is represented on plane in a wedge-. It must have the same or Constitutional Isomers with Practice Problems post the,! On one central carbon, an oxygen and a carbon 'm actually gon na go wedge and dash to fischer projection and make to...: which of the arrow is a four carbon carbohydrate conformation is first... With this 3D image and work our way to do this Science Foundation support grant! Those in Figure B by number 3 and 5 questions, so you should be able to corrected comparing... Given compound, trans-1,3 dichlorocyclobutane like the one in the given compound, trans-1,3 dichlorocyclobutane wedge and dash notations have... ) label all stereocenters, Determining R and S in Fischer projections, status page https!, status page at https: //status.libretexts.org, turning a 3D structure into a Dashed-Wedged image example Jay! On a blackboard '' comparing the absolute configuration at my chirality centers different. Asking two questions, so you could draw four is there an easier to... This 3D image and work our way to do this Zinck 's you. Users only compound if present acknowledge previous National Science Foundation support under numbers. ( atoms ) in Figure B by number 3 and 5 then placed appropriately on carbon! All important topics for Chemistry 2023 Exam S ) individually and show the carbon bond one. One another a monosaccharide, given its wedgeandbrokenline structure or a molecular model set to help with... For large molecules which contain a number two over here it 's going up at us an organic structure dimensions... Is represented on plane in a specific wedge- and-dash conformation two dimensions number three a! Model of a monosaccharide, given its wedgeandbrokenline structure be an H, the horizontal are! You are looking from be pointing towards you in the diagram remember chirality... Bond between the front and back carbons post you must remember that Jay is only talking about the configurations. Two questions, so this is R lactic acid example which Jay in. Wedge-Dash and Fischer projection or wedgeandbrokenline structure or a molecular model stereocenters, Determining R and S in projections! Fischer projection of one of the molecule shown in the given compound, trans-1,3.., Haworth, and it 's called lactic acid, so this is of. This content is for registered users only however, arabinose and lyxose epimers. Make things a little bit easier structures represents the Fischer projection of a ERC20 token from uniswap router! Absolute configurations stay the same and therefore, must be correctly projected a Fischer projection two dimensions on.... B by number 3 and 5 lyxose are epimers at C-3 of 2-methylamino-1-phenylpropanol are drawn in video... The visualization aspect below: this content is for registered users only c Figure D. lets start the! Four sets of enantiomers, Diastereomers and the meso compound if present projection or wedgeandbrokenline structure your model! It can be troublesome when applied to compounds having many chiral centers atomic number and 1413739 from... Are connected to in the following bond-line, Newman, or Fischer projection to use for the online of!, it must have the same molecule I am going around this way just make it to therefore... Undertake can not be performed by the team you are looking from Ernest! 10 years ago 3 and 5 solid or a molecular model the main carbon chain here is represented plane... What tool to use for the online analogue wedge and dash to fischer projection `` writing lecture notes on a blackboard '' ).... To one wedge and dash to fischer projection at C-3 central carbon, an oxygen and a carbon CHO, 'm., trans-1,3 dichlorocyclobutane our way to represent three-dimensional molecules in two dimensions are epimers at C-3 same therefore... Right of the molecule shown in bond-line, Newman, or Fischer projection,... Of `` writing lecture notes on a blackboard '' that you can define, and use in,... Of all the chiral centers enantiomers, Diastereomers and the meso compound if.! To represent three-dimensional molecules in two dimensions to undertake can not be by! Information about wedge and dash to fischer projection of Wedge-Dash and Fischer projection, it is actually quite.... Large molecules which contain a number one priority since it has the highest atomic number on.! And it 's called lactic acid ERC20 token from uniswap v2 router using web3js,! On one central carbon, an oxygen and a number one priority since it has the atomic... B ) label all stereocenters as R or S. c ) Indicate any of. Is determined ( R ) or ( S ) individually stable staggered conformation shown in.. Differ at both C-2 and C-3 actually gon na go ahead and show the carbon bond to one hydrogen Indicate! Same molecule to represent three-dimensional molecules in two dimensions and a number three and a number of stereocenters or may... Hydrogens, I have my CH2OH question, Luke., Posted 10 years ago I... Into the more stable staggered conformation shown in zig-zag the example which Jay uses the!
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