Photochemical Ring Opening of 7-Benzoyl- and 7-Methoxycarbonyldibenzonorcaradienes. Competing 1,2-Hydrogen Shift and Cyclization Reactions of 1,3-Diradicals
作者:Aneta Bogdanova、Vladimir V. Popik
DOI:10.1021/ol015938r
日期:2001.6.1
or alkoxycarbonyl substituent in the 7-position results in formation of substituted phenanthrenes, as well as cis-trans isomerization of the starting material. This reaction apparently proceeds via intermediate formation of a short-lived (tau = 1-20 ns) 1,3-diradical, which is produced by photochemical cleavage of one cyclopropane bond, while no evidence of alpha-carbonylcarbene formation was found.
[请参阅反应]。在7位上带有酰基或烷氧羰基取代基的二苯并降冰片烯的UV辐射导致形成取代的菲,以及起始原料的顺反异构化。该反应显然是通过短暂形成(tau = 1-20 ns)1,3-双自由基的中间过程而进行的,该自由基是通过光化学裂解一个环丙烷键而产生的,但没有发现形成α-羰基碳烯的证据。