Global electrophilicity indices and carbon-halogen bond energies of a wide series of halogen derivatives were calculated in terms of the density functional theory (DFT). The calculated values were used to estimate the reactivity of halogen derivatives under conditions of catalytic olefination. Reactions of N-unsubstituted hydrazones with polyhaloalkanes in the presence of CuCl afforded substituted alkenes. The relation between the structure of polyhaloalkanes and their reactivity was studied using the reaction with 4-chlorobenzaldehyde hydrazone as an example. It was found that increase in the global electrophilicity index and decrease in the C-Hlg bond energy are accompanied by increase in the “olefinating” power of halogen derivatives.
                                    根据密度泛函理论(DFT)计算了一系列卤素衍
生物的整体亲电指数和碳-卤键能。计算值用于估计催化烯化条件下卤素衍
生物的反应性。 N-未取代的腙与多卤代烷在 CuCl 存在下反应得到取代的烯烃。以与
4-氯苯甲醛腙的反应为例,研究了多卤代
烷烃的结构与反应活性的关系。研究发现,总体亲电指数的增加和C-Hlg键能的降低伴随着卤素衍
生物“烯化”能力的增加。