Acylarylnitrosamines. Part II. The formation of arynes in the anomalous decompositions of o-t-butyl- and 2,5-di-t-butyl-N-nitrosoacetanilide
作者:J. I. G. Cadogan、J. Cook、M. J. P. Harger、P. G. Hibbert、J. T. Sharp
DOI:10.1039/j29710000595
日期:——
3-t-butylbenzyne. 2,5-Di-t-butyl-N-nitrosoacetanilide similarly decomposes, in part, via 3,6-di-t-butylbenzyne. These abnormal decompositions are considered to arise as a result of preferential steric acceleration of unimolecular decomposition of the o-t-butylaryldiazonium cations to the corresponding carbonium ions, which either are converted into the ortho-acetates or to the aryne, which reacts with
的分解ø -t -丁基- ñ -nitrosoacetanilide苯给出ø -和米-t-butylphenylacetates(55%)而不是2-叔丁基联苯的预期产量高。在呋喃,蒽和2,3,4,5-四苯基环戊二烯酮存在下的芳烃加合物的分离以及涉及蒽和9,10-二甲氧基蒽的芳烃竞争实验的结果确定了3-叔丁基苯并the的参与。2,5-二叔丁基-N-亚硝基乙酰苯胺类似地通过3,6-二叔丁基苯并de分解。这些异常分解被认为是由于o的单分子分解的优先空间加速而产生的-t-butylaryldiazonium阳离子为相应的碳离子,其或者被转换成邻-acetates或所述芳炔,用乙酸进行反应,得到米-乙酸甲酯。反过来,由于空间位阻,这些芳烃被认为反应性较低。