Eight acetals of 3-trimethylsilylcyclohexanone were synthesized. The structures were determined by 1H NMR、MS and GC. Their characteristic odors were evaluated and found better than that of acetals of 4-trimethylsilyl...Eight acetals of 3-trimethylsilylcyclohexanone were synthesized. The structures were determined by 1H NMR、MS and GC. Their characteristic odors were evaluated and found better than that of acetals of 4-trimethylsilylcyclohexanone.展开更多
Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment resu...Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.展开更多
The ketalization of cyclohexanone with ethylene glycol catalyzed by I2 was studied.The effects of reaction time,reactant ratio,catalyst amount and the amount of water-carrying agent on the yield of cyclohexanone ethyl...The ketalization of cyclohexanone with ethylene glycol catalyzed by I2 was studied.The effects of reaction time,reactant ratio,catalyst amount and the amount of water-carrying agent on the yield of cyclohexanone ethylene glycol ketal was investigated.The results showed that the most suitable condition for the reaction were as follows:ethylene glyco:cyclohexanone molar ratio 1.2,molar ratio of catalyst to reactant 0.005%,cyclohexane as the water-carrying agent 6 ml,reaction time 30 min.The yield was up to 94.3%.展开更多
文摘Eight acetals of 3-trimethylsilylcyclohexanone were synthesized. The structures were determined by 1H NMR、MS and GC. Their characteristic odors were evaluated and found better than that of acetals of 4-trimethylsilylcyclohexanone.
文摘Wells-dawson type heteropolyacid catalyst was prepared by acidification-etherization and characterized by FTIR,over which cyclohexanone ethylene ketal was synthesized from cyclohexanone to ethylene.The experiment results showed that the optimal reaction conditions are as follows:the amount of Cyclohexanone is 0.1mol,the molar ratio of Cyclohexanone to ethylene was1.0/1.5(mol/mol),catalyst amount 1.50%(pencent of the reaction stock materials).Through reaction time 2.5h,the yield of cyclohexanone ethylene katal reached over 95.0%.
文摘The ketalization of cyclohexanone with ethylene glycol catalyzed by I2 was studied.The effects of reaction time,reactant ratio,catalyst amount and the amount of water-carrying agent on the yield of cyclohexanone ethylene glycol ketal was investigated.The results showed that the most suitable condition for the reaction were as follows:ethylene glyco:cyclohexanone molar ratio 1.2,molar ratio of catalyst to reactant 0.005%,cyclohexane as the water-carrying agent 6 ml,reaction time 30 min.The yield was up to 94.3%.