Regioselectivity of methyl chlorobenzoate analogues with trimethylstannyl anions by radical nucleophilic substitution: theoretical and experimental study
作者:Juan P. Montañez、Jorge G. Uranga、Ana N. Santiago
DOI:10.1039/b9nj00664h
日期:——
of methyl 2,5-dichlorobenzoate, methyl 4-chlorobenzoate, methyl 2-chlorobenzoate and methyl 3-chlorobenzoate with Me3Sn− ions gave the corresponding substitution products by an SRN1 mechanism. Competition experiments showed that the relative reactivity of chlorine as the leaving group with respect to the ester group in methyl chlorobenzoate is para ≥ ortho ≫ meta toward Me3Sn− ions. Theoretical studies
的反应 2,5-二氯苯甲酸甲酯, 4-氯苯甲酸甲酯, 2-氯苯甲酸甲酯 和 3-氯苯甲酸甲酯 和 我3锡-离子通过S RN 1机理给出了相应的取代产物。竞争实验表明氯 作为相对于酯基的离去基团 氯苯甲酸甲酯是对≥邻»元朝我3锡-离子。理论研究能够基于在这些反应中形成的自由基阴离子的过渡态的能量性质来解释观察到的反应性。