Neighboring Group Participation in Solvolysis. VII. Trifluoroacetolysis of ω-Phenylalkyl 6-Methyl-2-naphthalenesulfonates
作者:Takashi Ando、Junko Yamawaki、Yoshimasa Saito
DOI:10.1246/bcsj.51.219
日期:1978.1
order to elucidate the effect of a phenyl group at a remote position on the reactivity and the course of the reaction. The reactivities varied remarkably with the length of the alkyl chain(n); 2>>3 5>6. The rate enhancement was attributed to anchimeric assistance by a remote phenyl group, and the rate depression to the electron-withdrawing inductive effect of a phenyl group. Studies on reaction products
潮化合物 Ph(CH2)nOMns (n=2-6) 在缓冲的三氟乙酸中溶解,以阐明远端位置的苯基对反应性和反应过程的影响。反应活性随烷基链的长度(n)而显着变化;2>>3 5>6。速率提高归因于远程苯基的嵌合辅助,而速率降低归因于苯基的吸电子诱导效应。对反应产物的研究表明,在甲磺酸 4-苯基丁酯 (n=4) 的三氟乙酰化中,唯一发生的途径是 δ-苯基参与的途径,即使对于甲磺酸 5-苯基戊酯 (n=5),也有 12%反应通过 e-苯基参与进行。