Ch_322a_5.06

Ch_322a_5.06 - Properties of Enantiomers: Optical Activity...

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Properties of Enantiomers: Optical Activity Enantiomers are distinct stereoisomers . One structure cannot be superimposed on the other. However, the two stereoisomers are identical in all respects, except that they are mirror images of each other. It is not surprising that enantiomers have identical properties, except when they are in a chiral environment . Physical Properties of (R) and (S)-2-Butanol (R) (S) boiling point 99.5 o C 99.5 o C density (g/mL, 20 o C) 0.808 0.808 However, when plane-polarized light is passed through a solution of (R) -2-butanol, the plane is rotated in one direction and when plane-polarized light is passed through a solution of (S) -2-butanol, the plane is rotated in the opposite direction. This ability of a material to rotate the plane of plane-polarized light is called optical activity . Optical Activity
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Some Early Studies of Optical Activity In the early 19th century, experiments revealed the extraordinary interaction between light and minerals. In 1808 the French scientist
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Ch_322a_5.06 - Properties of Enantiomers: Optical Activity...

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