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PowerPoint slides 052610 and 052810

PowerPoint slides 052610 and 052810 - direction • Optical...

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Stereochemical Definitions and Terminology Stereoisomers: two molecules with the same connectivity, different arrangements of atoms in space Configuration: actual 3-dimensional arrangement of atoms and/or groups at a tetrahedral carbon Enantiomers: two molecules related as an object and its nonsuperimposible mirror image Chiral (adj.): not superimposible on mirror image, possesses “chirality” = handedness Achiral: superimposible on (identical to) its mirror image, i.e. without chirality
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Optical Activity A bulk property of a chiral substance. A substance is “optically active” if it rotates plane- polarized light. Optical rotation is measured by a polarimeter A substance that rotates plane-polarized light in the clockwise direction is “dextrorotatory”. This is the (+)- direction. A substance that rotates plane-polarized light in the counterclockwise direction is “levorotatory”. This is the (-)-
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