The reductive coupling reactions of aryl sulfonyl chloride induced by (TiCl4-Zn) reagent affords diaryl disulfide. However, reaction of aryl sulfonyl chloride with α,β-unsaturated ester under the same condition affo...The reductive coupling reactions of aryl sulfonyl chloride induced by (TiCl4-Zn) reagent affords diaryl disulfide. However, reaction of aryl sulfonyl chloride with α,β-unsaturated ester under the same condition affords β-arylsulfo ester.展开更多
A series of fluorinated unsaturated esters which can be used as fluorine-containing monomers have been synthesized. The esterification of maleic acid,itaconic acid,and trans-aconitic acid with 1, 1, 2, 2-tetrahydroper...A series of fluorinated unsaturated esters which can be used as fluorine-containing monomers have been synthesized. The esterification of maleic acid,itaconic acid,and trans-aconitic acid with 1, 1, 2, 2-tetrahydroperfluorooctanol and 1, 1, 5- octafluoropentanol was carried out, respectively. The objective monomers were obtained by using p-toluene sulfonic acid as catalyst, hydroquinone as the anti-polymerizing agent,toluene as solvent and water carrying agent. The objective products were isolated by column chromatography and characterized by Fourier transform infrared spectroscopy ( FT-IR ) , hydrogen-1 nuclear magnetic resonance ( 1 H NMR) ,fluorine-19 nuclear magnetic resonance ( 19 F NMR) ,and high resolution mass spectrometry ( HRMS) . The yield of the objective products was various from 30% to 85%. The reaction result shows that the esterification of 1, 1, 5 - octafluoropentanol with certain carboxylic acid is more difficult than that of 1,1,2,2-tetrahydroperfluorooctanol.展开更多
The epoxidation of unsaturated fatty acid methyl esters(FAMEs)by peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid was studied in the presence of SO3H-functional Brnsted acidic ionic liquid (I...The epoxidation of unsaturated fatty acid methyl esters(FAMEs)by peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid was studied in the presence of SO3H-functional Brnsted acidic ionic liquid (IL)[C3SO3HMIM][HSO4]as catalyst.The effects of hydrogen peroxide/ethylenic unsaturation ratio,acetic acid concentration,IL concentration,recycling of the IL catalyst,and temperature on the conversion to oxirane were studied.The kinetics and thermodynamics of unsaturated FAMEs epoxidation and the kinetics of oxirane cleavage of the epoxidized FAMEs by acetic acid were also studied.The conversion of ethylenic unsaturation group to oxirane, the reaction rate of the conversion to oxirane,and the rate of hydrolysis(oxirane cleavage)were higher by using the IL catalyst.展开更多
a-Phenylthio-a, b-unsaturated esters 6 were synthesized by Witting reaction of 3, which were prepared by a phenylsulfenyllation-trans-ylidation reaction.
文摘The reductive coupling reactions of aryl sulfonyl chloride induced by (TiCl4-Zn) reagent affords diaryl disulfide. However, reaction of aryl sulfonyl chloride with α,β-unsaturated ester under the same condition affords β-arylsulfo ester.
基金Scientific Innovation Research of College Graduate in Jiangsu Province,China ( No. CXZZ11-0106)National Natural Science Foundations of China ( No. 50973079,No. 51003071+1 种基金Natural Science Foundation of Jiangsu Province,China ( No. BK2010254)a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘A series of fluorinated unsaturated esters which can be used as fluorine-containing monomers have been synthesized. The esterification of maleic acid,itaconic acid,and trans-aconitic acid with 1, 1, 2, 2-tetrahydroperfluorooctanol and 1, 1, 5- octafluoropentanol was carried out, respectively. The objective monomers were obtained by using p-toluene sulfonic acid as catalyst, hydroquinone as the anti-polymerizing agent,toluene as solvent and water carrying agent. The objective products were isolated by column chromatography and characterized by Fourier transform infrared spectroscopy ( FT-IR ) , hydrogen-1 nuclear magnetic resonance ( 1 H NMR) ,fluorine-19 nuclear magnetic resonance ( 19 F NMR) ,and high resolution mass spectrometry ( HRMS) . The yield of the objective products was various from 30% to 85%. The reaction result shows that the esterification of 1, 1, 5 - octafluoropentanol with certain carboxylic acid is more difficult than that of 1,1,2,2-tetrahydroperfluorooctanol.
文摘The epoxidation of unsaturated fatty acid methyl esters(FAMEs)by peroxyacetic acid generated in situ from hydrogen peroxide and acetic acid was studied in the presence of SO3H-functional Brnsted acidic ionic liquid (IL)[C3SO3HMIM][HSO4]as catalyst.The effects of hydrogen peroxide/ethylenic unsaturation ratio,acetic acid concentration,IL concentration,recycling of the IL catalyst,and temperature on the conversion to oxirane were studied.The kinetics and thermodynamics of unsaturated FAMEs epoxidation and the kinetics of oxirane cleavage of the epoxidized FAMEs by acetic acid were also studied.The conversion of ethylenic unsaturation group to oxirane, the reaction rate of the conversion to oxirane,and the rate of hydrolysis(oxirane cleavage)were higher by using the IL catalyst.
基金Project 29502006 was supported by the National Natural Science Foundation of China.
文摘a-Phenylthio-a, b-unsaturated esters 6 were synthesized by Witting reaction of 3, which were prepared by a phenylsulfenyllation-trans-ylidation reaction.
