Intermediates in organic synthesis. Production method: The anhydrous ethanol, which is co-steamed with diethyl phthalate and sodium metal, is added to the mixture of diethyl malonate, carbon tetrachloride and magnesium. The reaction is heated to start, and the temperature is controlled to smooth the reaction. Chemicalbook is then added with anhydrous ether, heated for 1h, and the ether solution of phenylacetyl chloride is added (adding slowly, not making the reaction too drastic). After the reaction, the oil layer was separated by cooling and water, and the ether was evaporated under pressure to obtain diethyl phenacetomalonate