Bronsted acidic ionic liquids based on imidazolium cation were employed as efficient catalysts and mediums for the ring opening of phthalic anhydride to synthesize half-esters. Good yields, short reaction time and mil...Bronsted acidic ionic liquids based on imidazolium cation were employed as efficient catalysts and mediums for the ring opening of phthalic anhydride to synthesize half-esters. Good yields, short reaction time and mild reaction condition were achieved. Lower acidity of ionic liquid resulted in higher catalytic selectivity in the synthesis of half-esters. The minimum-energy geometries of sulfonic acid-functionalized ionic liquids based on imidazolium cation revealed that their acidities and catalytic selectivity in the synthesis of half-esters were related to their structures.展开更多
The kinetic behavior of reaction of dibasic acid half ester with epoxy compound, which is one of the key reaction occurring in the technology of liquid alkali developing type solder resists, was investigated in this p...The kinetic behavior of reaction of dibasic acid half ester with epoxy compound, which is one of the key reaction occurring in the technology of liquid alkali developing type solder resists, was investigated in this paper, by using the monomethyl esters of maleic acid, succinic acid, phthalic acid, cis 1,2,3,6 tetrahydrophthalic acid and cis hexahydrophthalic acid as model compounds. It was found that for the reaction catalyzed by tetramethyl ammonium bromide(TMAB), the reaction order for dibasic acid half ester and for PGE is 0 5 and 1 respectively when the dibasic acid monomethyl esters with a smaller size and/or with a stronger acitity were used, while it is 0 and 1 respectively when the dibasic acid monomethyl esters with a larger size and a weeker acitity were used. The reaction mechanism has also been discussed, from which a rate equation has been obtained which is in agreement with the experiment results.展开更多
The molecular electronegativity interaction vector （MEIV） was used to describe the molecular structure of 30 selected esters. Two excellent QSTR models were built up by using multiple linear regression （MLR） and p...The molecular electronegativity interaction vector （MEIV） was used to describe the molecular structure of 30 selected esters. Two excellent QSTR models were built up by using multiple linear regression （MLR） and partial least-squares regression （PLS）. The correlation coefficients （R） of the two models were 0.945 and 0.941, respectively. The models were evaluated by performing the cross validation with the leave-one-out （LOO） procedure. The cross-verification correlation coefficients （RCV） of the two models were 0.921 and 0.919, respectively. The results showed that the models constructed in this work could provide estimation stability and favorable predictive ability.展开更多
基金Supported by the Key Project of Chinese Ministry of Education (No 105075)the National Natural Science Foundation of China (No 20503016)
文摘Bronsted acidic ionic liquids based on imidazolium cation were employed as efficient catalysts and mediums for the ring opening of phthalic anhydride to synthesize half-esters. Good yields, short reaction time and mild reaction condition were achieved. Lower acidity of ionic liquid resulted in higher catalytic selectivity in the synthesis of half-esters. The minimum-energy geometries of sulfonic acid-functionalized ionic liquids based on imidazolium cation revealed that their acidities and catalytic selectivity in the synthesis of half-esters were related to their structures.
文摘The kinetic behavior of reaction of dibasic acid half ester with epoxy compound, which is one of the key reaction occurring in the technology of liquid alkali developing type solder resists, was investigated in this paper, by using the monomethyl esters of maleic acid, succinic acid, phthalic acid, cis 1,2,3,6 tetrahydrophthalic acid and cis hexahydrophthalic acid as model compounds. It was found that for the reaction catalyzed by tetramethyl ammonium bromide(TMAB), the reaction order for dibasic acid half ester and for PGE is 0 5 and 1 respectively when the dibasic acid monomethyl esters with a smaller size and/or with a stronger acitity were used, while it is 0 and 1 respectively when the dibasic acid monomethyl esters with a larger size and a weeker acitity were used. The reaction mechanism has also been discussed, from which a rate equation has been obtained which is in agreement with the experiment results.
基金supported by the Youth Foundation of Education Bureau, Sichuan Province (09ZB036)Technology Bureau, Sichuan Province (2006j13-141)
文摘The molecular electronegativity interaction vector （MEIV） was used to describe the molecular structure of 30 selected esters. Two excellent QSTR models were built up by using multiple linear regression （MLR） and partial least-squares regression （PLS）. The correlation coefficients （R） of the two models were 0.945 and 0.941, respectively. The models were evaluated by performing the cross validation with the leave-one-out （LOO） procedure. The cross-verification correlation coefficients （RCV） of the two models were 0.921 and 0.919, respectively. The results showed that the models constructed in this work could provide estimation stability and favorable predictive ability.
