采用三氯氧磷法合成了一种新型五取代有机胍N,NN′,N′-四甲基-N″-苯基胍(PhTMG),利用IR、^1HNMR、ESI-MS等方法对其结构进行了表征。考察了PhTMG对以二甘醇(DEG)、氯丙烯(ACH)和CO2为原料合成二甘醇双烯丙基碳酸酯(ADC)反应的催化性能,ADC的最高收率为95.3%。采用GC-MS、XRD、IR等分析手段结合实验验证对ADC合成反应机理进行了研究,推测出该反应分4步进行:第1步,COa、DEG和Na2CO3反应生成二甘醇单碳酸钠盐;第2步,二甘醇单碳酸钠盐和ACH反应生成二甘醇单烯丙基碳酸酯(DGAC);第3步,DGAC、CO2和Na2CO3反应生成二甘醇单烯丙基碳酸酯单碳酸钠盐;第4步,二甘醇单烯丙基碳酸酯单碳酸钠盐与ACH反应生成目的产物ADC。并推测了反应体系中的主要副反应。
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.