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Isobenzopyrylium cations

Reaction of the isobenzopyrylium cation (430) with N2H4 gives (431) (93KGS1475). 1/7-2,3-Benzodiazepines (433) (73JCS(Pl)2543) and analogous thienodiazepines (80JCS(P1)1718) are obtained from electrocyclic reaction of diazo derivatives (432). [Pg.646]

Other cation-pseudobase equilibrations that have received detailed spectral investigation include quaternary isoquinoline alkaloids and related isoquinolinium derivatives,910 naphthyridinium mono- and dications,26,38,42 44 50 pyridinium cations,51,52 isobenzopyrylium (isochro-mylium) cations,53 benzothiopyrylium (thiochromylium) cations,40 and 1,3-dithiolium cations.54 PMR spectroscopy has also been useful in the identification of pseudobases as reaction intermediates in several reactions in solution.55-57 While 13C-NMR spectroscopy is also potentially useful for the assignment of pseudobase structure, at present there do not appear to... [Pg.8]

See other pages where Isobenzopyrylium cations is mentioned: [Pg.213]    [Pg.470]    [Pg.213]    [Pg.470]    [Pg.244]    [Pg.592]    [Pg.122]    [Pg.244]    [Pg.160]   
See also in sourсe #XX -- [ Pg.482 ]

See also in sourсe #XX -- [ Pg.482 ]



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