The Sensitized Photooxidation of Cycloheptatriene (Tropilidene). Isolation and Thermal Isomerization of (4π+2π) Cycloadduct, 8,9-Dioxabicyclo[3.2.2]-2,6-nonadiene, and Preparation of Tropone
作者:Toyonobu Asao、Morio Yagihara、Yoshio Kitahara
DOI:10.1246/bcsj.51.2131
日期:1978.7
The sensitized photooxidation of cycloheptatriene (tropilidene) in methanol afforded (4π+2π) cycloadduct; 8,9-dioxabicyclo[3.2.2]-2,6-nonadiene (1), 6-hydroxy-2,4-cycloheptadienone and 6-oxoheptadienal presumably derived from (6π+2π) cycloadduct, and small amounts of tropone and benzaldehyde. Mechanism of their formation are discussed. It was found that the treatment of the photooxidation mixture with
环庚三烯(tropilidene)在甲醇中的敏化光氧化得到(4π+2π)环加合物;8,9-二氧杂双环[3.2.2]-2,6-壬二烯 (1)、6-羟基-2,4-环庚二烯酮和 6-氧代庚二烯醛可能衍生自 (6π+2π) 环加合物,以及少量的托酮和苯甲醛. 讨论了它们的形成机制。发现用三乙胺处理光氧化混合物以约50%的产率提供了托酮。1 在回流二甲苯中的热异构化得到顺式-3,9-二氧杂三环-[6.1.0.02.4]-5-壬烯、8-氧杂双环[5.1.0]-4-辛烯-3-one 和 4-羟基-2 ,6-环庚二烯酮。