作者:Ivica Malnar、Sandra Jurić、Valerije Vrček、Željka Gjuranović、Zlatko Mihalić、Olga Kronja
DOI:10.1021/jo0107608
日期:2002.3.1
cleaved C-Cl bond. The doubly unsaturated compound 3 (1,1-dimethyl-4,8-alkadienyl chloride) solvolyzes with further reduction of the isotope effect, and a drastically lower entropy of activation (k(H)/k(D) = 1.14 +/- 0.01; DeltaS(++) = -152 +/- 12 J mol(-1) K(-1), in 80% v/v aqueous ethanol), suggesting that the solvolysis of 3 proceeds by way of extended pi-participation, i.e., the assistance of both
叔1,1-二甲基-4-链烯基氯(1)溶剂分解具有显着降低的次级β-氘动力学同位素效应(具有两个三氘甲基)的底物,并且其熵和活化焓低于参考的饱和类似物4(k( H)/ k(D)= 1.30 +/- 0.03 vs k(H)/ k(D)= 1.79 +/- 0.01; Delta Delta H(++)= -9 kJ mol(-1),Delta Delta S (++)= -36 J mol(-1)K(-1),在80%v / v的乙醇水溶液中),表明双键参与了速率确定步骤。在理论上的MP2(fc)/ 6-31G(d)水平计算的过渡结构1-TS显示,该反应通过晚期过渡态进行,该过渡态具有明显的双键参与和基本上断裂的C-Cl键。双不饱和化合物3(1,1-二甲基-4,