在UB3LYP/6-311++G(3df,3pd)水平下,详细研究了Ni活化NH3分子的单重态和三重态势能面,并用分子中的原子量子理论(Quantum Theory of Atom-in-Molecular,QTAIM)计算了势能面上所有驻点的性质.计算结果表明,单重态势能面有两条反应途径,...在UB3LYP/6-311++G(3df,3pd)水平下,详细研究了Ni活化NH3分子的单重态和三重态势能面,并用分子中的原子量子理论(Quantum Theory of Atom-in-Molecular,QTAIM)计算了势能面上所有驻点的性质.计算结果表明,单重态势能面有两条反应途径,而三重态势能面仅有一条反应途径.第一个N-H断开的活化能较低,为99.96kJ/mol,活化自由能为100.86kJ/mol,在常温下就可以进行;第二个N-H键断裂所需能量高达200kJ/mol,不容易进行.在合适温度下,Ni可以活化NH3得到三重态HNiNH2,这表明Ni可以作为活化NH3分子的良好催化剂.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
基金Project supported by the National Natural Science Foundation of China(No.51303069)and the Top-Notch Academic Programs Project of Jiangsu Higher Education Institutions(No.PPZY2015B146)~~
文摘在UB3LYP/6-311++G(3df,3pd)水平下,详细研究了Ni活化NH3分子的单重态和三重态势能面,并用分子中的原子量子理论(Quantum Theory of Atom-in-Molecular,QTAIM)计算了势能面上所有驻点的性质.计算结果表明,单重态势能面有两条反应途径,而三重态势能面仅有一条反应途径.第一个N-H断开的活化能较低,为99.96kJ/mol,活化自由能为100.86kJ/mol,在常温下就可以进行;第二个N-H键断裂所需能量高达200kJ/mol,不容易进行.在合适温度下,Ni可以活化NH3得到三重态HNiNH2,这表明Ni可以作为活化NH3分子的良好催化剂.
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.
