Solvolytic studies of tricyclo[4.2.0.02,4]octan-5-yl derivatives. Effect of cyclopropane and cyclobutane orbital alignments on reactivity and proclivity for rearrangement
作者:Leo A. Paquette、Osvaldo Cox、Masayoshi Oku、Richard P. Henzel
DOI:10.1021/ja00822a029
日期:1974.7
implicates a rigid cation geometry and highly directed discharge by solvent. Studies of the products obtained from hydrolysis of deuterium labeled ester 42 showed the absence of deuterium scrambling and excluded the operation of cyclopro- pylcarbinyl-cyclopropylcarbinyl rearrangement. Carbocationic leakage of the homoallylic -+ allylic type was also not in evidence. A connection is diaMiil beiweeii various
四种可能的立体异构三环(4.2.0.02~4)辛基-5-基3,5-二硝基苯甲酸酯和对硝基苯甲酸酯在 80 醇水溶液中的水解动力学已在多个温度下进行了研究。目前结果的一个显着特征是两对异构体都收敛到两个相关但非互变的阳离子(51 和 52),只有后者能够由于立体电子学原因进行环丁烷开环或扩环。1a,2&4&6a-二硝基苯甲酸酯均得到相同的产物混合物(10个半衰期后),由外顺式-双环(4.2.0)oct-2-en-5-ol(21a)及其内部返回的酯21b组成。la,Za,4a,6a 系列中的电离导致差向异构 cis-bicyclo(3.3.0)oct-2-en-6-ols (26 and 27, 52-58 z)、endo-cis-bicyclo (4.2.0)oct-2-en-5-ol (28, 33-41 %), 多年来对环丙基羰基衍生物的溶剂分解反应的研究为三元环和相邻的 sp2 杂化碳