The complex of Bis(2,4 pentanedionato) Cobalt has been synthesized.The structure has been characterized by infrared spectra and element analysis.The catalytic activity of the complex in the cyclohexene allylic oxidati...The complex of Bis(2,4 pentanedionato) Cobalt has been synthesized.The structure has been characterized by infrared spectra and element analysis.The catalytic activity of the complex in the cyclohexene allylic oxidation by oxygen molecule has been studied.The influences of reaction temperature,time,solvents and additives on the oxidation have been determined.The results show that when the oxidation is carried out under the reaction conditions of 70～80℃,4～10h and 2.0Mpa/O 2,the main product is cyclohexene 2 one.The conversion of cyclohexene increases with the rise of the reaction temperature,time and polarity of solvent.Some additives,such as imidazole,could improve the selectivity of cyclohexene 2 one.展开更多
A novel carbonyl transposition reaction led by aromatic amines nucleophilic addition to \{2 oxo glycoside\} was discovered. The mechanism of the reaction was provided through tracing the change of 1H NMR of a hemiacet...A novel carbonyl transposition reaction led by aromatic amines nucleophilic addition to \{2 oxo glycoside\} was discovered. The mechanism of the reaction was provided through tracing the change of 1H NMR of a hemiacetal intermediate which was obtained in the reaction of o phenylene diamine with 2 oxo glycoside. Both the intermediate and the product were identified by FTIR, 1H NMR, 13 C NMR, 1H 1H COSY and 1H 13 C COSY spectra. The other aromatic amines reaction with 2 oxo glycoside also proved the mechanism. This reaction provides a new method for preparing 2 deoxy 2 aromatic amino 3 oxo glycosides, which is a new kind of material used in assymetric synthesis.展开更多
文摘The complex of Bis(2,4 pentanedionato) Cobalt has been synthesized.The structure has been characterized by infrared spectra and element analysis.The catalytic activity of the complex in the cyclohexene allylic oxidation by oxygen molecule has been studied.The influences of reaction temperature,time,solvents and additives on the oxidation have been determined.The results show that when the oxidation is carried out under the reaction conditions of 70～80℃,4～10h and 2.0Mpa/O 2,the main product is cyclohexene 2 one.The conversion of cyclohexene increases with the rise of the reaction temperature,time and polarity of solvent.Some additives,such as imidazole,could improve the selectivity of cyclohexene 2 one.
文摘A novel carbonyl transposition reaction led by aromatic amines nucleophilic addition to \{2 oxo glycoside\} was discovered. The mechanism of the reaction was provided through tracing the change of 1H NMR of a hemiacetal intermediate which was obtained in the reaction of o phenylene diamine with 2 oxo glycoside. Both the intermediate and the product were identified by FTIR, 1H NMR, 13 C NMR, 1H 1H COSY and 1H 13 C COSY spectra. The other aromatic amines reaction with 2 oxo glycoside also proved the mechanism. This reaction provides a new method for preparing 2 deoxy 2 aromatic amino 3 oxo glycosides, which is a new kind of material used in assymetric synthesis.
