The addition of the butenyl—zinc bond in CH3CHCHCH2ZnX derivatives VI–XII (X n-C4H9, t-C4H9, Ph, cyclohexyl, Cl, OCH3, OPh) to styrene (XIII) affords a mixture of Zn → Cprim and Zn → Csec products. The regioselectivity can be controlled by the inductive effects of the substituents X. The log (Zn → Cprim/Zn → Csec) depends linearly on the polar Taft constants of the substituents X.
加入在CH
丁烯基-
锌键的3 CHCHCH 2 ZNX衍
生物VI-XII(XNC 4 ħ 9,TC 4 ħ 9中,Ph,环己基,
氯,OCH 3,OPH)至
苯乙烯(XIII),得到Zn→C prim和Zn→C sec产物的混合物。区域选择性可以通过取代基X的感应作用来控制。log(Zn→C prim / Zn→C sec)线性依赖于取代基X的极性塔夫脱常数。