作者:Duncan M. A. Grieve、Graham E. Lewis、Michael D. Ravenscroft、Peter Skrabal、Takaaki Sonoda、Ivanka Szele、Heinrich Zollinger
DOI:10.1002/hlca.19850680534
日期:1985.8.14
ion (7). Only 1, 4, 6, and 7 exchange their diazo group with ‘external’ molecular N2. The results are explained on the hypothesis that only organic species which have an empty σ orbital and which are effective in π electron back-donation are able to react with N2. Thus, reaction with carbenes is likely to occur only if the carbene is in the 1A2 singlet state and if its electrophilicity is high.
在溶液中研究了15种N标记的重氮化合物的热N 2交换。涉及的化合物是3-重氮-1-甲基吲哚-2-酮(1),9-重氮芴(2),5-重氮-1,3-环戊二烯-1,2,3,4-四甲腈(3),2 -重氮2 H-咪唑-4,5-二碳腈(4),4-重氮环己-2,5-二烯酮(5)以及4和5的共轭酸,即4,5-二氰基-1 H-咪唑-2-重氮离子(6)和4-羟基苯重氮离子(7)。只有1,4,6和7用“外部”分子N 2交换它们的重氮基团。该结果基于以下假设进行了解释:只有具有空σ轨道且有效进行π电子返配的有机物种才能与N 2反应。因此,仅在卡宾处于1 A 2单线态且亲电性高的情况下,才可能发生与碳烯的反应。