Abstract:

N,N,N′,N′-tetramethyl-N″- phenylguanidine(PhTMG) was synthesized from tetramethylurea (TMU) and PhNH₂ in the presence of POCl₃, and its structure was determined by means of IR , ¹H NMR and ESI-MS analysis.The catalytic performance of PhTMG was evaluated in the reaction for synthesis of diethylene glycol bis(allyl carbonate) (ADC) via carbon dioxide route and the highest yield of ADC was 95.3 %.The reaction mechanism of ADC synthesis was investigated by means of GC-MS, XRD, IR and experimental verification, which suggested that the reaction for synthesis of ADC proceeded in four steps: the reaction of carbon dioxide with diethylene glycol (DEG) and Na₂CO₃ to form diethylene glycol mono sodium carbonate; the formation of diethylene glycol mono allyl carbonate (DGAC) from the reaction of allyl chloride (ACH) and diethylene glycol mono sodium carbonate; the reaction of DGAC with carbon dioxide and Na₂CO₃ to form diethylene glycol mono (allyl carbonate) mono (sodium carbonate); the formation of ADC by the reaction of diethylene glycol mono (allyl carbonate) mono (sodium carbonate) with ACH.Some important side reactions were also proposed.