Synthesis of Cinnamic Acid

The characters of the paths were summarized,and the path of using pyridine as condensation agent,benzaldehyde and malonic acid by Knoevenagel condensation reaction was mainly studied.By using the method of single-factor and multi-levels,the yield of cinnamic acid as an index,the reaction conditions such as catalyst ratio,reactant ratio,reaction temperature,reaction time were examined to give the preferable process.In the preferable process,the yield of cinnamic acid was 95%.The result was characterized by infrared spectrum and the structure was verified with HPLC.This path was simple,with high yield and less pollution.