{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Stereochemistry and Reaction Mechanisms", "refinement": "This problem involves understanding the stereochemical outcomes of reactions involving chiral compounds and the influence of different reducing agents on these outcomes.", "specific_scope": "The focus is on determining the correct starting materials for two reactions that yield specific stereoisomers of a product after reduction with different agents.", "goal": "Identify the appropriate chiral starting materials (A and B) that will lead to the desired stereochemical products when treated with LiBH4 and BH3, respectively."}, "summary": "This problem is rooted in organic chemistry, specifically in the area of stereochemistry and reaction mechanisms. It requires understanding how different reducing agents affect the stereochemical outcome of reactions involving chiral compounds. The task is to select the correct starting materials for two reactions that will yield specific stereoisomers of a product. The goal is to determine which pair of compounds (A and B) will produce the desired (R) and (S) configurations of the final products when treated with LiBH4 and BH3, respectively."}