It was established that photodecarbonylation of o-benzoquinones occurs by irradiation not only by UV-light, but visible light (λ> 520nm) 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 of reaction of photodecarbonylation of o- ...
