CHEM 341 Lecture Notes - Meso Compound, Reaction Mechanism, Carbocation

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30 Mar 2014
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Chirality, enantiomers how to recognize their structures. Chirality, enantiomers how to recognize its formation in reactions. Reaction define it (list sm, reagent and products) Remember you will be tested on different types of applications. Diastereomers stereoisomers that are not enantiomers, cannot be superimposed with their mirror images. Molecule with n asymmetric centers can have a maximum of 2n stereoisomers (3 centers: 23 = 8 max possible stereoisomers) Special case: only 3 stereoisomers exist when four identical groups are bonded to each of the centers. Meso compound has asymmetric centers, but it is achiral. Reagent and product have the same relative configuration. Two substituents added to same side of bond: syn. Two substituents added to opposite sides of bond: anti. Reactant with no asymmetric center pair of enantiomers (equal amounts r and s) Reactant with asymmetric center pair of diastereomers (unequal amounts) Carbocation intermediate syn & anti mixture of four stereoisomers (three of all substituents identical)