A novel method of preparing dimethyl malonate by carbonylation of methyl chloroacetate catalyzed by Na[Co(CO)(4)] was proposed. Na[Co(CO)(4)] was synthesized in situ in the presence of Na2S2O3 and iron powder. The eff...A novel method of preparing dimethyl malonate by carbonylation of methyl chloroacetate catalyzed by Na[Co(CO)(4)] was proposed. Na[Co(CO)(4)] was synthesized in situ in the presence of Na2S2O3 and iron powder. The effects of some reaction parameters such as temperature. CO pressure and the concentrations of catalyst on the yields of dimethyl malonate were discussed. The kinetic data were studied and a possible reaction mechanism was proposed.展开更多
HeI ultraviolet photoelectron spectra of some thienyl polyethylenic dimethyl malonates compoundsf(1),(2),(3)(to see Fig.1)have been given in this paper. The assignment of the spectra are also done using the optimized ...HeI ultraviolet photoelectron spectra of some thienyl polyethylenic dimethyl malonates compoundsf(1),(2),(3)(to see Fig.1)have been given in this paper. The assignment of the spectra are also done using the optimized MNDO molecular orbital calculation for each studied molecules. It is shown that the linear reduction of HOMO ionization energy (Ip) which is mainly antiboding in character of ethylenic group with the increment of ethylenic group number is fortunately the basis of the homologous lineax rule of this series of compounds. And it is also pointed out that weight of two -COOCH3 groups in the HoMO orbital is very small, that is to say, they can not be differentiated as the terminal or substituent.展开更多
文摘A novel method of preparing dimethyl malonate by carbonylation of methyl chloroacetate catalyzed by Na[Co(CO)(4)] was proposed. Na[Co(CO)(4)] was synthesized in situ in the presence of Na2S2O3 and iron powder. The effects of some reaction parameters such as temperature. CO pressure and the concentrations of catalyst on the yields of dimethyl malonate were discussed. The kinetic data were studied and a possible reaction mechanism was proposed.
文摘HeI ultraviolet photoelectron spectra of some thienyl polyethylenic dimethyl malonates compoundsf(1),(2),(3)(to see Fig.1)have been given in this paper. The assignment of the spectra are also done using the optimized MNDO molecular orbital calculation for each studied molecules. It is shown that the linear reduction of HOMO ionization energy (Ip) which is mainly antiboding in character of ethylenic group with the increment of ethylenic group number is fortunately the basis of the homologous lineax rule of this series of compounds. And it is also pointed out that weight of two -COOCH3 groups in the HoMO orbital is very small, that is to say, they can not be differentiated as the terminal or substituent.
