作者:M.P. Shurygina、Yu.A. Kurskii、N.O. Druzhkov、S.A. Chesnokov、L.G. Abakumova、G.K. Fukin、G.A. Abakumov
DOI:10.1016/j.tet.2008.07.008
日期:2008.10
It was established that photodecarbonylation of o-benzoquinones occurs by irradiation not only by UV-light, but visible light (λ>520 nm) too. Study of the series of 4,5-di-substituted 3,6-di-tert-butyl-o-benzoquinones detected that the only product of photoreaction is the corresponding 3,4-di-substituted 2,5-di-tert-butyl-cyclopentadienone, which is formed in a yield close to quantitative. NMR monitoring
已经确定,不仅通过紫外线照射,而且通过可见光(λ> 520nm)照射,也会发生邻苯甲醌的光脱羰基化。对4,5-二取代3,6-二叔丁基-邻-苯醌的系列研究发现,光反应的唯一产物是相应的3,4-二取代2,5-二叔丁基。丁基环戊二烯酮,产率接近定量。核磁共振监测o的光脱羰反应-苯醌检测到这是一个两个阶段的过程。在第一阶段,醌的光激发分子重排为包含五元和三元循环的双环化合物(bicyclo [1.3.0] hexa-3-en-2,6-dione),该化合物在随后的黑暗阶段自发分解为环戊二烯酮和一氧化碳分子。