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Tautomerizations tetracyclic compounds

The valence tautomerism 251 257 has been proposed to account for the formation of iV-methylthiobenzamide by irradiation (2537 A) in methyl cyanide solution. The valence tautomer 257, R = Me, = Ph, has been detected spectroscopically (p , 2060 cm —N=C=S) either during photolysis at 25° or by heating at 160°. Photochemical oxidative cyclization of 4,5-diaryl derivatives (251, R = R = Ar) analogous to the formation of phenanthrene from stilbene has been reported. Thus, irradiation of the 4,5-diphenyl derivative 251, R = R = Ph, yields the tetracyclic meso-ionic compound (258). ... [Pg.55]

See other pages where Tautomerizations tetracyclic compounds is mentioned: [Pg.278]    [Pg.278]    [Pg.110]    [Pg.340]    [Pg.458]    [Pg.258]    [Pg.357]    [Pg.301]    [Pg.293]    [Pg.134]   
See also in sourсe #XX -- [ Pg.31 ]

See also in sourсe #XX -- [ Pg.31 ]



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Tetracyclic

Tetracyclics

Tetracyclization

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