Photochemical Reactions of Regioisomeric 2,2-Dimethyl-5,5-diphenyl- and 5,5-Dimethyl-2,2-diphenyl-Substituted Diazo Ketones of a Tetrahydrofuran Series
作者:Ludmila L. Rodina、Sergey A. Malashikhin、Olesya S. Galkina、Valerij A. Nikolaev
DOI:10.1002/hlca.200900079
日期:2009.10
2‐dimethyl‐5,5‐diphenyl‐ and 5,5‐dimethyl‐2,2‐diphenyl‐substituted 4‐diazodihydrofuran‐3(2H)‐ones 1a and 1b, respectively, is the Wolff rearrangement, while other photochemical processes, which are giving rise to the formation of CH‐insertion, 1,2‐alkyl‐ or ‐aryl‐shifts, as well as H‐atom‐abstraction products occur to a much lower degree (Schemes 2 and 3). The ratio of similar reaction products from
区域异构体2,2-二甲基-5,5-二苯基-和的常规光解的主方向5,5-二甲基-2,2-二苯基-取代的4- diazodihydrofuran-3(2 ħ) -酮1A和1B,分别是沃尔夫重排,而其他光化学过程会形成CH插入,1,2-烷基或芳基移位以及H原子吸收产物。学位要低得多(方案2和3)。来自区域异构体1a和1b的相似反应产物的比例基本上不依赖于它们的结构,Ph和重氮基团之间的相对位置对CH插入产物的收率几乎没有影响。根据立体化学方面的考虑,沃尔夫diazodihydrofuran-3(2的重排ħ) -酮显然前进以一致的方式,而在1,2-移和H原子的抽象产品点的反应混合物外观的并行生成在单线态和三线态碳烯的光解过程中(方案4和5)。