A kind of salt-based colloid palladium of high concentration was prepared, with concentration up to 3.6 g/L on amount of PdCl2. The optimal preparation conditions of the salt-based colloid palladium were that the PdCl...A kind of salt-based colloid palladium of high concentration was prepared, with concentration up to 3.6 g/L on amount of PdCl2. The optimal preparation conditions of the salt-based colloid palladium were that the PdCl2 and NaCl concentrations were respectively 3.6 g/L and 175 g/L, mole ratio of Sn to Pd was 50∶1, reaction temperature was 2035 ℃, with urea, ascorbic acid and vanillin added in a proper amount. The test results of optimal condition show that the time of starting hydrogen-deposition is 9 s, the time of completely coating copper on a test substrate is 2 min, the stability time of colloid palladium is 98 h after it is diluted into 0.1 g/L（on amount of PdCl2） when the solution temperature is 20 ℃, the backlight lever of electroless copper plating layer is 10th grade of 10-grade system, the adhesion force of the copper layer is up to GB5270—85 of China, and the average particle size of the colloid palladium is 81 nm measured by Master Sizer.展开更多
A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternati...A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternatives CH2F2 and CHClF2. Addition of CoCl2, GaCl3 and CuCl2 to PdCl2-(n-C4H9),N+Cl- modifies the catalytic performance of supported molten salts.展开更多
Palladium catalyzed ethoxycarbonylation reaction of arenediazonium tetrafluoroborates has been carried out under very mild conditions in the presence of a catalytic amount of Pd(OAc) 2 and CaO to afford a variety of s...Palladium catalyzed ethoxycarbonylation reaction of arenediazonium tetrafluoroborates has been carried out under very mild conditions in the presence of a catalytic amount of Pd(OAc) 2 and CaO to afford a variety of substituted ethyl benzoates in good yields. The effects of the catalyst and the base on ethoxycarbonylation reaction were investigated and CaO was shown to be the best base. The ethoxycarbonylation reaction can tolerate a variety of substituents in the benzene rings and has very high chemoselectivity. This paper provides a simple and practical procedure for syntheses of a variety of substituted ethyl benzoates.展开更多
基金Project supported by Hubei Daye Nonferrous Metal Corporation of China
文摘A kind of salt-based colloid palladium of high concentration was prepared, with concentration up to 3.6 g/L on amount of PdCl2. The optimal preparation conditions of the salt-based colloid palladium were that the PdCl2 and NaCl concentrations were respectively 3.6 g/L and 175 g/L, mole ratio of Sn to Pd was 50∶1, reaction temperature was 2035 ℃, with urea, ascorbic acid and vanillin added in a proper amount. The test results of optimal condition show that the time of starting hydrogen-deposition is 9 s, the time of completely coating copper on a test substrate is 2 min, the stability time of colloid palladium is 98 h after it is diluted into 0.1 g/L（on amount of PdCl2） when the solution temperature is 20 ℃, the backlight lever of electroless copper plating layer is 10th grade of 10-grade system, the adhesion force of the copper layer is up to GB5270—85 of China, and the average particle size of the colloid palladium is 81 nm measured by Master Sizer.
文摘A novel supported liquid phase film catalyst: Supported PdCl2-(n-C4H9),N+Cl- molten salts was found to be an effective catalyst with good stability for selective hydrodechlorination of CCl2F2 (CFC-12) to its alternatives CH2F2 and CHClF2. Addition of CoCl2, GaCl3 and CuCl2 to PdCl2-(n-C4H9),N+Cl- modifies the catalytic performance of supported molten salts.
文摘Palladium catalyzed ethoxycarbonylation reaction of arenediazonium tetrafluoroborates has been carried out under very mild conditions in the presence of a catalytic amount of Pd(OAc) 2 and CaO to afford a variety of substituted ethyl benzoates in good yields. The effects of the catalyst and the base on ethoxycarbonylation reaction were investigated and CaO was shown to be the best base. The ethoxycarbonylation reaction can tolerate a variety of substituents in the benzene rings and has very high chemoselectivity. This paper provides a simple and practical procedure for syntheses of a variety of substituted ethyl benzoates.
