Evidence of a Nitrene Tunneling Reaction: Spontaneous Rearrangement of 2-Formyl Phenylnitrene to an Imino Ketene in Low-Temperature Matrixes
作者:Cláudio M. Nunes、Stephanie N. Knezz、Igor Reva、Rui Fausto、Robert J. McMahon
DOI:10.1021/jacs.6b07368
日期:2016.11.30
Triplet 2-formyl phenylnitrene was generated by photolysis of 2-formyl phenylazide isolated in Ar, Kr, and Xe matrixes and characterized by IR, UV-vis, and EPR spectroscopies. Upon generation at 10 K, the triplet nitrene spontaneously rearranges in the dark to singlet 6-imino-2,4-cyclohexadien-1-ketene on the time scale of several hours. The intramolecular [1,4] H atom shift from the nitrene to the
三重 2-甲酰基苯氮卓是通过在 Ar、Kr 和 Xe 基质中分离的 2-甲酰基苯叠氮的光解产生的,并通过 IR、UV-vis 和 EPR 光谱进行表征。在 10 K 下生成后,三线态氮烯在黑暗中自发地重排为单线态 6-亚氨基-2,4-环己二烯-1-烯酮,时间为数小时。分子内 [1,4] H 原子从氮烯转移到亚氨基乙烯酮是通过在三重态流形上的隧穿发生的,然后是系统间交叉。这个案例构成了涉及氮烯的隧道反应的第一个直接证据。