Photochemistry of organic nitrogen compounds. Part III. The formation of allenes and 1,3-dienes from pyrazolenines: a photochemical reaction involving ion-pairs
作者:A. C. Day、M. C. Whiting
DOI:10.1039/j29670000991
日期:——
The photolysis of pyrazolenines normally gives cyclopropenes via a vinyldiazoalkane; but, in the present work 3-(1′-acyloxyalkyl)-5,5-dimethylpyrazolenines have been found to give allene and 1,3-diene esters in good yield, together with small quantities of a vinylallene. Attempts to trap an intermediate diazoalkene by photolysis in the presence of acid were not successful, leading merely to partial
吡唑啉的光解反应通常通过乙烯基重氮烷烃生成环丙烯。但是,在目前的工作中,发现3-(1'-酰氧基烷基)-5,5-二甲基吡唑腈与少量的乙烯基烯丙基烯能以良好的产率得到烯丙基和1,3-二烯酸酯。尝试在酸存在下通过光解来捕获中间重氮烯烃是不成功的,仅导致产物中酰氧基的部分随机化。已经对随机化程度进行了定量研究,其结果与涉及分子间和分子内过程的离子机制相符,并且在某些方面与建议的氮热分解机理相似。-亚硝基酰胺。建议了一条可能的通向乙烯基碳离子的一般路线。