The relative rates of halogenation of XC6H4CH2CH2F with N-bromosuccinimide in CCI4 at 80° and with sulphuryl chloride in benzene at 40° are correlated by the Hammett equation to give ρ+–1·43 (r0·996) and ρ–0·96 (r0·985), respectively. The different nature of the transition states of atomic bromine and the benzene-complexed chlorine atom with the substrates XC6H4CH2Y previously noted has been consistently
通过Hammett方程将XC 6 H 4 CH 2 CH 2 F与CCI 4中的N-
溴琥珀
酰亚胺在40°和与
苯磺酰氯在40°中的卤化的相对速率相关联,得到ρ+ 1–43(r 0·996)和ρ-0·96(r 0·985)。一直观察到原子
溴和苯络合的
氯原子与先前提到的底物XC 6 H 4 CH 2 Y的过渡态具有不同的性质。PhCHDY和PhCD 2的N-
溴琥珀
酰亚胺溴化中的
氘同位素效应已针对Y = Ph,CH 2 Cl,CH 2 F和Cl测量了Y ,这些值与未确定化合物的相对反应性有关。