Photochemistry of 1- and 2-Methyl-5-aminotetrazoles: Structural Effects on Reaction Pathways
作者:A. Ismael、R. Fausto、M. L. S. Cristiano
DOI:10.1021/acs.joc.6b02023
日期:2016.12.2
The influence of the position of the methyl substituent in 1- and 2-methyl-substituted 5-aminotetrazoles on the photochemistry of these molecules is evaluated. The two compounds were isolated in an argon matrix (15 K) and the matrix was subjected to in situ narrowband UV excitation at different wavelengths, which induce selectively photochemical transformations of different species (reactants and initially
评价了1-和2-甲基取代的5-氨基四唑中甲基取代基的位置对这些分子的光化学的影响。将这两种化合物分离在氩气基质(15 K)中,并对基质进行不同波长的原位窄带UV激发,从而诱导不同物种(反应物和最初形成的光产物)的选择性光化学转化。反应的进行是通过红外光谱法进行的,并得到了量子化学计算的支持。结果表明,两种异构体的光化学是:1-甲基-(1 H)-四唑-5-胺(1a)和2-甲基-(2 H)-四唑-5-胺(1b)),尽管会产生普通的中间体重氮3,随后会进行光转化为1-氨基-3-甲基碳二亚胺(H 2 N–N═C═N–CH 3),但存在显着差异:形成氨基氰胺4(H 2 N-N(CH 3)-C≡N)只从异构体的光裂解观察到1a中,而形成的腈亚胺的2(H 2 N-C - = N + = N-CH 3)只得到来自1b的光解。由异构体1b独家形成腈亚胺指出只有2 H-四唑形式可以直接进入腈亚胺的可能性,而对