A series of aromatic acids has been tested as additives for the platinum-catalyzed hydrosilylation of styrene with triethoxysilane. Both excellent conversion of styrene and selectivity in favor of the ,β-adduct were ...A series of aromatic acids has been tested as additives for the platinum-catalyzed hydrosilylation of styrene with triethoxysilane. Both excellent conversion of styrene and selectivity in favor of the ,β-adduct were achieved using aminobenzoic acids as additive. Moreover, the use of 4-aminobenzoic acid led to significantly superior enhancement in both catalytic activity and selectivity among the tested aminobenzoic acids. Indeed, 100% conversion of styrene and 98.4% selectivity in favor of the β-adduct were obtained. Additionally, hydrosilylations of various alkenes with a variety of platinum catalysts have also been tested, and in each case the conversion of substrate and the selectivity of the β-adduct were promoted by using 4-aminobenzoic acid as additive.展开更多
The polystyrene supported phenylalanine Schiff base complex of Mn（Ⅱ） （PS-Sal-Phe-Mn ） was prepared with chloromethylated styrene polymer heads, 2 L-phenylalanine and manganese （Ⅱ） acetate tetrahyrate., The pol...The polystyrene supported phenylalanine Schiff base complex of Mn（Ⅱ） （PS-Sal-Phe-Mn ） was prepared with chloromethylated styrene polymer heads, 2 L-phenylalanine and manganese （Ⅱ） acetate tetrahyrate., The polymeric ligand and the complex were characterized by FT.IR,, small area X-ray photoelectron spectroscopy （XPS）, and ICP-AES. in the presence of the manganese complex, cyclohexene （1） was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2.cyclohexen-l-ol （2）, 2-cyclohexen-l-one （3）and 2-cyclohexen-1-hydroperoxide （4）, which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-l-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.展开更多
基金Supported by the National High Technology Research and Development Program of China (2006AA03A134)Zhejiang Province Program (2008C14041)
文摘A series of aromatic acids has been tested as additives for the platinum-catalyzed hydrosilylation of styrene with triethoxysilane. Both excellent conversion of styrene and selectivity in favor of the ,β-adduct were achieved using aminobenzoic acids as additive. Moreover, the use of 4-aminobenzoic acid led to significantly superior enhancement in both catalytic activity and selectivity among the tested aminobenzoic acids. Indeed, 100% conversion of styrene and 98.4% selectivity in favor of the β-adduct were obtained. Additionally, hydrosilylations of various alkenes with a variety of platinum catalysts have also been tested, and in each case the conversion of substrate and the selectivity of the β-adduct were promoted by using 4-aminobenzoic acid as additive.
文摘The polystyrene supported phenylalanine Schiff base complex of Mn（Ⅱ） （PS-Sal-Phe-Mn ） was prepared with chloromethylated styrene polymer heads, 2 L-phenylalanine and manganese （Ⅱ） acetate tetrahyrate., The polymeric ligand and the complex were characterized by FT.IR,, small area X-ray photoelectron spectroscopy （XPS）, and ICP-AES. in the presence of the manganese complex, cyclohexene （1） was effectively oxidized by molecular oxygen without reductant. The major products of the reaction were 2.cyclohexen-l-ol （2）, 2-cyclohexen-l-one （3）and 2-cyclohexen-1-hydroperoxide （4）, which was different with typical oxidation of cyclohexene. The influence of reaction temperature and additive for oxidation had been studied. The selectivity of 2-cyclohexen-l-hydroperoxide varied with reaction time and different additives. The mechanism of cyclohexene oxidation had also been discussed.
