{"knowledge_schema": {"broad_category": "Organic Chemistry \u2192 Reaction Mechanisms \u2192 Synthesis", "refinement": "This problem involves a series of organic reactions starting from trans-Cinnamaldehyde and leading to the final product C through specific reagents and reaction types.", "specific_scope": "The focus is on determining the number of carbon atoms in the final product C after a series of transformations including Grignard reaction, oxidation, and Wittig reaction.", "goal": "Calculate the total number of carbon atoms in product C based on the transformations from trans-Cinnamaldehyde."}, "summary": "This problem involves a sequence of organic reactions starting with trans-Cinnamaldehyde. The first step involves a Grignard reaction with ethylmagnesium bromide, followed by oxidation with Jones reagent, and finally a Wittig reaction with methylenetriphenylphosphorane. To find the number of carbon atoms in the final product C, we need to track the carbon count through each step. Starting with 9 carbons in trans-Cinnamaldehyde, the addition of ethyl (2 carbons) increases the count to 11, and the Wittig reaction adds another carbon, resulting in a total of 12 carbons in product C."}