Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. Thi...Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. This process was quantified by UV-Vis spectra. A possible mechanism was put forward based on the formation of amphiphilic aggregates.展开更多
In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with...In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.展开更多
A green synthesis route of diethyl malonate by palladium catalyzed carbonylation of ethyl chloroacetate in the presence of phase transfer agent is carried out under mild conditions in good yield. The effects of reacti...A green synthesis route of diethyl malonate by palladium catalyzed carbonylation of ethyl chloroacetate in the presence of phase transfer agent is carried out under mild conditions in good yield. The effects of reaction temperature and different bases on the yield of diethyl malonate are also discussed.展开更多
文摘Hydrophilic hyperbranched poly(ester-amine) (HPEA) synthesized from diethanolamine and methyl acrylate was used as phase transfer agent for the first time to transfer methyl orange (MO) from water into chloroform. This process was quantified by UV-Vis spectra. A possible mechanism was put forward based on the formation of amphiphilic aggregates.
文摘In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.
文摘A green synthesis route of diethyl malonate by palladium catalyzed carbonylation of ethyl chloroacetate in the presence of phase transfer agent is carried out under mild conditions in good yield. The effects of reaction temperature and different bases on the yield of diethyl malonate are also discussed.
