Polystyrene N-hydroxyl sulfonamide resin 1 was prepared and used to catalyze the esterification of n-butanol and acetic anhydride. The mechanism of catalytic esterification proved by IR spectra of the resins was found...Polystyrene N-hydroxyl sulfonamide resin 1 was prepared and used to catalyze the esterification of n-butanol and acetic anhydride. The mechanism of catalytic esterification proved by IR spectra of the resins was found that O-H and N-H of the N-hydroxyl sulfonamide resin reacted with the acetic anhydride respectively to form the active intermediate polystyrene N,O-diacetyl sulfonamate which was cleaved by n-butanol to produce butyl acetate. The catalytic esterification by resin 1 was in good agreement with the kinetic model of 揵i-bi-ping-pong?mechanism.展开更多
Using 2,3-dichloro-5,6-dicyano-p-benzoquinone(DDQ)as the oxidant,we communicate an efficient oxidative C–N coupling of benzylic C–H bonds with amides to afford a series of amination products in good yields.A wide ra...Using 2,3-dichloro-5,6-dicyano-p-benzoquinone(DDQ)as the oxidant,we communicate an efficient oxidative C–N coupling of benzylic C–H bonds with amides to afford a series of amination products in good yields.A wide range of functional groups as well as various sulfonamides and carboxamides are well tolerated.Moreover,this reaction involves both the challenging C–H functionalization and C–N bond formation.展开更多
We demonstrated here a new family of multi-responsive polymer:wholly aromatic sulfonated polyamide(SPA).SPA exhibited the unusual response to temperature and pH with the tunable low critical solution temperature(LCST)...We demonstrated here a new family of multi-responsive polymer:wholly aromatic sulfonated polyamide(SPA).SPA exhibited the unusual response to temperature and pH with the tunable low critical solution temperature(LCST).LCST of the obtained SPA decreased sharply with the increasing pH,and the difference of LCST between pH 6.0-6.8 is about 60 ℃.展开更多
基金Natural Science Foundation of China (Project number: 20074017)
文摘Polystyrene N-hydroxyl sulfonamide resin 1 was prepared and used to catalyze the esterification of n-butanol and acetic anhydride. The mechanism of catalytic esterification proved by IR spectra of the resins was found that O-H and N-H of the N-hydroxyl sulfonamide resin reacted with the acetic anhydride respectively to form the active intermediate polystyrene N,O-diacetyl sulfonamate which was cleaved by n-butanol to produce butyl acetate. The catalytic esterification by resin 1 was in good agreement with the kinetic model of 揵i-bi-ping-pong?mechanism.
基金supported by the National Basic Research Program of China(2011CB808600,2012CB725302)the National Natural Science Foundation of China(21390400,21272180,21302148)+2 种基金the Research Fund for the Doctoral Program of Higher Education of China(20120141130002)the Program for Changjiang Scholars and Innovative Research Team in University(IRT1030)The Program of Introducing Talents of Discipline to Universities of China(111 Program)is also appreciated
文摘Using 2,3-dichloro-5,6-dicyano-p-benzoquinone(DDQ)as the oxidant,we communicate an efficient oxidative C–N coupling of benzylic C–H bonds with amides to afford a series of amination products in good yields.A wide range of functional groups as well as various sulfonamides and carboxamides are well tolerated.Moreover,this reaction involves both the challenging C–H functionalization and C–N bond formation.
基金the National Natural Science Foundation of China(21174085)Science & Technology and Education Commission of Shanghai Municipal Government(11QA1403100,12ZZ020)+1 种基金the Shanghai Leading Academic Discipline Project(B202)X.Jiang is supported by the SMC Project of Shanghai Jiao Tong University
文摘We demonstrated here a new family of multi-responsive polymer:wholly aromatic sulfonated polyamide(SPA).SPA exhibited the unusual response to temperature and pH with the tunable low critical solution temperature(LCST).LCST of the obtained SPA decreased sharply with the increasing pH,and the difference of LCST between pH 6.0-6.8 is about 60 ℃.
