Polar influences in radical reactions. Part VII. Hydrogen abstraction from nuclear-substituted diphenylmethanes, deoxybenzoins, and allylbenzenes by atomic bromine
作者:T. P. Low、Kheng H. Lee
DOI:10.1039/j29700000535
日期:——
The relative reactivities of nuclear-substituted diphenylmethanes, deoxybenzoins (X·C6H4·CH2Bz), and allylbenzenes towards atomic bromine at 80° have been determined by means of competitive reactions by use of allylbenzene, diphenylmethyl methyl ether, and p-bromoethylbenzene, respectively, as reference standard. The results show ρ-values of –0·93, –0·92, and –0·68 by the Hammett equation for the three
核取代的二苯基甲烷的相对反应性,deoxybenzoins(X·C 6 H ^ 4 ·CH 2 BZ)°已经通过竞争反应的手段通过使用烯丙基苯的确定,并在80朝原子溴allylbenzenes,二苯基甲基醚,和p -溴乙基苯分别作为参考标准。结果表明,通过哈米特方程,三个系统的ρ值分别为–0·93,–0·92和–0·68,前两个系统的σ-常数相关性更好,而在第三个系统中σ + -常数与先前的报告具有更好的相关性。与σ相关的可能原因-常量将被讨论。这些系统的ρ值与先前观察到的反应性值具有一致的反比关系。