Description of a Method for Preparation
Pour an appropriate amount of ethanol (Etoh) into the kettle, then slowly add sodium metal (Na), and wait for it to completely melt to obtain a sodium alcohol solution. This process requires attention to the intensity of the reaction to moderately regulate the reaction rate and prevent accidents.

Add diethyl malonate (Diethyl Malonate) dropwise to the above sodium alcohol solution under stirring. At this time, the temperature of the reaction system may rise slightly. When the temperature change is closely monitored, if necessary, an external cooling means can be used to maintain the appropriate temperature. Add it dropwise and continue to stir for several hours to ensure sufficient reaction. During the

reaction, the intermolecular interactions are complicated, and the activity check point of diethyl malonate undergoes a nucleophilic substitution reaction with the ethoxy anion produced by sodium alcohol to generate the corresponding substitution product. This product can be used as a key intermediate in subsequent organic synthesis, participating in the construction of multiple and complex organic molecular structures. When the reaction reaches the expected level, the product can be separated and purified according to a specific post-treatment process, such as extraction, distillation, recrystallization, etc., to obtain a pure product, which lays the foundation for subsequent organic synthesis steps.