Surprising secondary photochemical reactions observed on conventional photolysis of diazotetrahydrofuranones
作者:Valerij A. Nikolaev、Olesja S. Galkina、Jochim Sieler、Ludmila L. Rodina
DOI:10.1016/j.tetlet.2010.03.050
日期:2010.5
during direct photolysis of regioisomeric 2,2-dimethyl-5,5-diphenyl and 5,5-dimethyl-2,2-diphenyl-substituted 3-diazotetrahydrofuran-4-ones in THF is dictated by photochemical cycloelimination of the originally formed (1,1-dimethyl-2-oxa-3,3-diphenyl-propano)ketene and oxetanecarboxylic acid derivatives to yield benzophenone. The latter, under subsequent UV irradiation of the reaction mixture, initiates
在区域异构体2,2-二甲基-5,5-二苯基和5,5-二甲基-苯酚的直接光解过程中,重氮基团的末端N原子C–H插入产物形成四氢呋喃的α-СН键。 THF中的2,2-二苯基取代的3-重氮四氢呋喃-4-酮是通过将最初形成的(1,1-二甲基-2-氧杂-3,3-二苯基-丙烷)乙烯酮和氧杂环丁烷羧酸衍生物进行光化学环消除而决定的产生二苯甲酮。后者在随后的反应混合物的紫外线照射下,引发起始重氮酮的光敏分解,导致插入产物与溶剂一起出现。