The lettered products ( A-D ) in the given reaction scheme are to be filled. Concept introduction: CBS reagents are chiral reducing agent, which selectively reduce keto compounds into corresponding alcohols. These are of two types; ( R )-CBS, and ( S )-CBS. The ( R )-CBS reagent provides H: − from behind to convert keto compounds into ( S ) isomer of an alcohol as the major product. The ( S )-CBS reagent provides H: − from front to convert keto compounds into ( R ) isomer of an alcohol as the major product.

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Chapter 20, Problem 20.50P

Interpretation Introduction

Interpretation: The lettered products (A-D) in the given reaction scheme are to be filled.

Concept introduction: CBS reagents are chiral reducing agent, which selectively reduce keto compounds into corresponding alcohols. These are of two types; (R)-CBS, and (S)-CBS. The (R)-CBS reagent provides H:− from behind to convert keto compounds into (S) isomer of an alcohol as the major product. The (S)-CBS reagent provides H:− from front to convert keto compounds into (R) isomer of an alcohol as the major product.

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