X-ray-Induced Transformation of <i>o</i>-Vinylbenzaldehyde and 2-Methylbenzocyclobutenone to an <i>o</i>-Quinoid Ketene and Its Radical Cation
作者:Krzysztof Huben、Zhendong Zhu、Thomas Bally、Jerzy Gebicki
DOI:10.1021/ja964243w
日期:1997.3.1
Upon ionization in argon matrices by X-irradiation, o-vinylbenzaldehyde (VBA) partially undergoes transfer of the formyl hydrogen atom to the vinylic CH2 group, thereby forming a quinoketene radical cation of the type previously described (Bally, T.; Michalak, J. J. Photochem. Photobiol. A: Chem. 1992, 69, 185). This process does not manifest itself clearly in the optical spectra because the transitions
通过 X 辐射在氩气基质中电离后,邻乙烯基苯甲醛 (VBA) 将甲酰基氢原子部分转移到乙烯基 CH2 基团,从而形成前述类型的喹烯酮自由基阳离子 (Bally, T.; Michalak, JJ Photochem. Photobiol. A:Chem. 1992, 69, 185)。这个过程在光谱中并没有清楚地表现出来,因为 quinoketene 阳离子的跃迁与 VBA•+ 的强得多的跃迁重合,并且大部分都被那些遮蔽了。然而,红外光谱清楚地表明重排发生得相当有效。他们还表明,在 X 辐射过程中,互变异构化的阳离子以良好的产率被再中和成 VBA 的喹诺酮互变异构体。喹烯酮及其自由基阳离子独立地从 2-甲基苯并环丁烯酮中获得,2-甲基苯并环丁烯酮在光解和/或电离时自发开环。自由基阳离子的光谱基于CASPT2校准...