Selective photorearrangement of 1-(2-naphthoyl)aziridine to 2-(2-naphthyl)-2-oxazoline by polybromobenzenes
作者:Sei-ichi Nishimoto、Tsukuru Izukawa、Tsutomu Kagiya
DOI:10.1039/p29830001147
日期:——
Photoreactions of 1-(2-naphthoyl)aziridine (1) in the presence of various brominated hydrocarbons (4a–f) in deaerated benzene solution have been studied at room temperature. The selective photorearrangement of (1) to 2-(2-naphthyl)-2-oxazoline (2) was promoted by 1,3,5-tribromobenzene (4a) and 1,4-dibromobenzene (4b). The nonpolar solvent benzene favoured selective photorearrangement, compared with polar
在室温下研究了1-(2-萘甲酰基)氮丙啶(1)在各种溴化烃(4a-f)存在下在脱气苯溶液中的光反应。1,3,5-三溴苯(4a)和1,4-二溴苯(4b)促进了(1)对2-(2-萘基)-2-恶唑啉(2)的选择性光重排。与极性乙腈相比,非极性溶剂苯有利于选择性光重排。一系列的溴化碳氢化合物(4a–e)而不是CH 3(CH 2)2 Br(4f)与(1)形成1:1的基态络合物。(1)的荧光发射被(4a–f)有效淬灭。荧光猝灭速率常数(k q)随着半波还原电位(E(4a–f)的红色½)。(1)的光敏三重态反应没有得到(2),而是少量的低聚物。光重排(Φ –1)的量子产率的倒数与非复合(4a)([[4a)]游离) –1 }的浓度成正比。