{"knowledge_schema": {"broad_category": "Organic Chemistry \u2192 Reactions \u2192 Nucleophilic Substitution", "refinement": "This problem involves the reaction of cyclohexanone with LDA and benzaldehyde, followed by a reaction with diethylaminosulfur trifluoride (DAST) to introduce fluorine substituents.", "specific_scope": "The focus is on determining the structure of the final product after the specified reactions, particularly the introduction of fluorine atoms and the stereochemistry of the resulting compound.", "goal": "Identify the correct structure of product 2 based on the reaction sequence and the reagents used."}, "summary": "In this organic chemistry problem, cyclohexanone undergoes a reaction with LDA and benzaldehyde, followed by treatment with diethylaminosulfur trifluoride (DAST) to introduce fluorine substituents. The task is to determine the structure of the final product after these reactions. The focus is on understanding the nucleophilic substitution mechanism and the stereochemistry involved in the formation of product 2. The goal is to select the correct structure from the provided candidates based on the reaction sequence."}