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Phenol ring, photochemical excitation

Photochemical rearrangement of 1, 4, and 64 has been examined in dichloromethane by steady irradiation and nanosecond transient spectroscopy. The ring enlargement of 1 to 292 and 4 to 293, respectively, has been postulated to occur via the singlet excited state. Phenolic derivatives 294 and 295 are formed from 1 and 4, respectively, via their triplet state. Product sensitization is proposed for the conversion of 1 and 4 to 294 and 295, respectively.167 Van Duuren et al. have found that on UV irradiation (254 nm) in methylene chloride, 4 rearranges to oxepin 293,4-hydroxypyrene, pyrene, and other unidentified products.168... [Pg.142]

See other pages where Phenol ring, photochemical excitation is mentioned: [Pg.46]    [Pg.224]    [Pg.65]    [Pg.961]    [Pg.281]    [Pg.560]    [Pg.86]    [Pg.380]    [Pg.334]    [Pg.281]    [Pg.226]    [Pg.235]    [Pg.3788]    [Pg.376]    [Pg.847]    [Pg.42]    [Pg.187]    [Pg.177]    [Pg.2797]   


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Phenol ring

Photochemical excitation

Ring phenolic

Ring photochemical

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