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机构地区:[1]天水师范学院生命科学与化学学院,甘肃天水741001
出 处:《天水师范学院学报》2009年第2期59-61,共3页Journal of Tianshui Normal University
基 金:甘肃省教育厅科研基金"卡宾与羰基化合物插入反应机理及其热力学与动力学性质理论研究"(0708-11)阶段性成果
摘 要:在b3lyp/6—311g(d,p)水平上运用经Wigner校正的Eyring过渡态理论和统计热力学方法,对CCI,与CHaMH(M=O,S)中C—H键、M—H键插入反应的热力学与动力学性质及其拓扑积分性质进行了研究。计算结果表明,在250~850K的温度范围内,更有利于CCl2插入甲醇O-H键生成产物P1[CH3OCHCl2]的反应I(1)的发生.而在850-2200K的温度范围内,反应I(1)及I(2)[插入C—H键,生成P3:Cl2HCCH2OH]没有明显的选择优势;CCl2插入甲硫醇O-H[反应II(1)]及C—H[反应II(2)]的适宜温度为400-1600K,低温下有利于生成CH3SCHCl2,而在高温下,反应II(1)及II(2)的选择性优势也不明显。最后,讨论了被插入C—H键、O—H键及S—H键中H原子的能量变化.The statistical thermodynamics and Eyring transition state theory with Wigner correction are used to study the thermodynamic and dynamics characters of reaction I(1) [insertion O-H in CH3OH], reaction I(2) [insertion C-H in CH3OH], reaction II(1) [insertion S-H in CH3SH], reaction II(2) [insertion C-H in CH3SH] in temperature range from 100K to 2200K. The results show that the appropriate reaction temperature rang is 250K to 2000K and 400K to 1600K at 1.0 atm for reaction I and II respectively. The rate constant and equilibrium constant are distinct in the range from 250K to 850K so that the reaction I(1) more easily occurs compare to the reaction I(2), while the reactions are not selected in the temperature range from 850K to 2000 K.
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