It was investigated that the reaction of 4,4′-diphenylmethanediamine(MDA)with CO2 and bromoethane to synthesize diethyl 4,4′-diphenylmethanedicarbamate(MDC)under the catalysis of Cs2CO3 cooperating with DBU in super...It was investigated that the reaction of 4,4′-diphenylmethanediamine(MDA)with CO2 and bromoethane to synthesize diethyl 4,4′-diphenylmethanedicarbamate(MDC)under the catalysis of Cs2CO3 cooperating with DBU in supercritical carbon dioixide.The optimum reaction conditions were MDA(10mmol),EtBr(30mmol),Cs2CO3(6mmol)as catalyst cooperating with DBU(30mmol),a temperature of 60 °C,a pressure of 8 MPa,and a reaction time of 4 hours.MDC was obtained in the yield of 88% under the optimum reaction condtions.展开更多
文摘It was investigated that the reaction of 4,4′-diphenylmethanediamine(MDA)with CO2 and bromoethane to synthesize diethyl 4,4′-diphenylmethanedicarbamate(MDC)under the catalysis of Cs2CO3 cooperating with DBU in supercritical carbon dioixide.The optimum reaction conditions were MDA(10mmol),EtBr(30mmol),Cs2CO3(6mmol)as catalyst cooperating with DBU(30mmol),a temperature of 60 °C,a pressure of 8 MPa,and a reaction time of 4 hours.MDC was obtained in the yield of 88% under the optimum reaction condtions.
