Ch_322a_5.02

Ch_322a_5.02 - 2-butanol. Achiral Molecules Achiral...

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Enantiomers and Chiral Molecules Enantiomers are possible only with molecules that are chiral . If a molecule has two distinct stereoisomeric forms that are mirror image related , it is chiral . These stereoisomeric forms are called enantiomers . An Example: 2-Butanol To determine if a molecule is chiral, it is necessary to draw a stereostructure that conveys the three-dimensional features of the structure. C H OH CH 3 CH 2 CH 3 A Stereostructure B is the mirror image of A. C CH 3 H HO CH 2 CH 3 B A and B are nonsuperimposable mirror image isomers. They are enantiomers and 2-butanol is chiral . Stereostructure A shows the key stereochemical features of
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Unformatted text preview: 2-butanol. Achiral Molecules Achiral molecules do not exist in two unique stereoisomeric forms that are mirror image related (enantiomers). The mirror image of an achiral molecule can be superimposed upon the original structure. Example: 2-Propanol C H OH CH 3 CH 3 A C CH 3 H HO CH 3 B Stereostructure B is the mirror image of A . But, B may be superimposed on A by a rotation of 180 o , as shown. rotate Stereostructures A and B represent two different views of the same structure. They are not unique stereoisomeric forms of 2-propanol. 2-Propanol is an achiral molecule ....
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_5.02 - 2-butanol. Achiral Molecules Achiral...

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