Matrix Isolation ofo-Quinoid Compounds – 6-Imino-2,4-cyclohexadien-1-one and 1,2-Diimino-3,5-cyclohexadiene
作者:Jens Morawietz、Wolfram Sander
DOI:10.1002/jlac.199619961213
日期:1996.12
formed as primary intermediates is very rapid, and thus the nitrenes are short-lived transients even under the conditions of matrix isolation. Ring expansion to azacycloheptatetraenes was not observed. FVP produces the thermodynamically most stable E/Z isomers of the quinones as the main products. Photolysis of the matrix-isolated quinones results in photostationary equilibria of the E/Z isomers. The
邻叠氮苯酚(5b)和邻叠氮苯胺(5c)高产产生6-氨基2,4-环己二酮1(1b)和1,2-二亚氨基3,5-环己二烯(1c)。分别通过在10 K的氩气基质中进行辐照或通过快速真空热解(FVP),随后将产物捕集在固体氩气中。作为主要中间体而形成的苯基氮化物6中的氢迁移非常快,因此,即使在基质分离的条件下,腈也是短暂的瞬态。没有观察到扩环成氮杂环庚酸酯。FVP产生热力学最稳定的E / Z醌的异构体为主要产物。基质分离的醌的光解导致E / Z异构体的光平稳平衡。立体异构体是通过在理论RMP2-FC-6 / 31G(d)级别从头计算得到的基质IR光谱进行比较来鉴定的。