Hydride reduction (with LiAlH4 or NaBH4) of each of the following ketones has been reported in the chemical literature and gives a mixture of two diastereomeric alcohols in each case. Give the structures or build molecular models of both alcohol products for each ketone.
(a) (S)-3-Phenyl-2-butanone
(b) 4-tert-Butylcyclohexanone