引用本文:
张启衍, 李跃进, 陈金昌, 陈荣悌, 张正之, 王序昆. 过渡金属五卤苯基化合物的研究
Ⅸ. 双(二苯基甲基膦)合(五氯苯基)氯化镍(Ⅱ)与吡啶及取代吡啶亲核取代反应动力学和机理[J]. 物理化学学报, 1985, 1(05): 460-463. doi: 10.3866/PKU.WHXB19850510
Citation: Zhang Qiyan, Li Yuejin, Chen Jinchang, Chen Rongti, Zhang Zhengzhi, Wang Xukun. STUDIES ON TRANSITION-METAL PERHALOPHENYL COMPOUNDS
Ⅸ. KINETICS AND MECHANISM OF SUBSTITUTION REACTIONS OF CHLORO-BIS (DIPHENYLMETHYLPHOSPHINE) (PENTACHLOROPHENYL)-NICKEL(Ⅱ) WITH PYRIDINE AND SUBSTITUTED PYRIDINE[J]. Acta Physico-Chimica Sinica, 1985, 1(05): 460-463. doi: 10.3866/PKU.WHXB19850510
Ⅸ. 双(二苯基甲基膦)合(五氯苯基)氯化镍(Ⅱ)与吡啶及取代吡啶亲核取代反应动力学和机理[J]. 物理化学学报, 1985, 1(05): 460-463. doi: 10.3866/PKU.WHXB19850510
Citation: Zhang Qiyan, Li Yuejin, Chen Jinchang, Chen Rongti, Zhang Zhengzhi, Wang Xukun. STUDIES ON TRANSITION-METAL PERHALOPHENYL COMPOUNDS
Ⅸ. KINETICS AND MECHANISM OF SUBSTITUTION REACTIONS OF CHLORO-BIS (DIPHENYLMETHYLPHOSPHINE) (PENTACHLOROPHENYL)-NICKEL(Ⅱ) WITH PYRIDINE AND SUBSTITUTED PYRIDINE[J]. Acta Physico-Chimica Sinica, 1985, 1(05): 460-463. doi: 10.3866/PKU.WHXB19850510
过渡金属五卤苯基化合物的研究
Ⅸ. 双(二苯基甲基膦)合(五氯苯基)氯化镍(Ⅱ)与吡啶及取代吡啶亲核取代反应动力学和机理
English
STUDIES ON TRANSITION-METAL PERHALOPHENYL COMPOUNDS
Ⅸ. KINETICS AND MECHANISM OF SUBSTITUTION REACTIONS OF CHLORO-BIS (DIPHENYLMETHYLPHOSPHINE) (PENTACHLOROPHENYL)-NICKEL(Ⅱ) WITH PYRIDINE AND SUBSTITUTED PYRIDINE
Abstract:
The kinetics of nucleophilic substitution reactions between trans-(Ph_2PMe)_2 Ni(C_6Cl_5)Cl and pyridine and various substituted pyridines in ethanol has been studied. In the presence of NH_4Cl (0.004M), the pseudo-first-order rate cons tant can be expressed by
k_(obs)=(k_1′[am]/(k_2/k_3)[Cl~-]+([am])+k_(am)′[am])
The rate constants and their corresponding activation parameters have been measu red and a reaction mechanism is proposed. The results show that the rate of sub stitution reactions is primarily verned by steric effect rather rather than the basicity of the entering group.
k_(obs)=(k_1′[am]/(k_2/k_3)[Cl~-]+([am])+k_(am)′[am])
The rate constants and their corresponding activation parameters have been measu red and a reaction mechanism is proposed. The results show that the rate of sub stitution reactions is primarily verned by steric effect rather rather than the basicity of the entering group.
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