Question

How many stereoisomers are obtained from the reaction of 3-methyl-2-butanone with each of the following organometallic reagents followed by the addition of dilute acid? Name each stereoisomer.

ethyllithium
methylmagnesium bromide

Answer 1

Answer:

ethylllithium: 2 stereoisomers - (R)-2,3-dimethyl-3-pentanol and (S)-2,3-dimethyl-3-pentano

methylmagnesium bromide: no stereoisomers (one compound) - 2,3-dimethyl-2-butanol

Explanation:

See the attached file for the mechanism and products.