{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Reaction Mechanisms", "refinement": "This problem involves understanding the stereochemistry of organic compounds and how different reducing agents affect the outcome of reactions.", "specific_scope": "The focus is on identifying the correct starting materials for two reactions that yield specific stereoisomers of a product when treated with different reducing agents.", "goal": "Determine the appropriate starting materials (A and B) that lead to the desired products with the specified stereochemistry."}, "summary": "This problem is rooted in organic chemistry, specifically in the area of reaction mechanisms and stereochemistry. It requires identifying the correct starting materials for two reactions that produce specific stereoisomers when treated with different reducing agents. The goal is to select the appropriate compounds that will yield the desired products, taking into account the influence of the reducing agents on the stereochemical outcome."}