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Pseudo-cross-conjugated heterocyclic

D. Pseudo-cross-conjugated Heterocyclic Mesomeric Betaines. 131... [Pg.67]

D. PSEUDO-CROSS-CONJUGATED HETEROCYCLIC Mesomeric Betaines... [Pg.131]

Quaternization of harman (235) with ethyl bromoacetate, followed by cyclization of the pyridinium salt 236 with 1,2-cyclohexane-dione in refluxing ethanol yielded an ester which on hydrolysis gave the pseudo-cross-conjugated mesomeric betaine 237. Decarboxylation resulted in the formation of the alkaloid Sempervirine (238). The PCCMB 237 is isoconjugate with the 11/7-benzo[u]fluorene anion—an odd nonalternant hydrocarbon anion—and belongs to class 14 of heterocyclic mesomeric betaines (Scheme 78). [Pg.135]

See other pages where Pseudo-cross-conjugated heterocyclic is mentioned: [Pg.74]    [Pg.156]    [Pg.74]    [Pg.156]    [Pg.74]    [Pg.131]    [Pg.156]    [Pg.40]    [Pg.147]    [Pg.74]    [Pg.156]    [Pg.74]    [Pg.156]    [Pg.74]    [Pg.156]    [Pg.74]    [Pg.131]    [Pg.156]    [Pg.40]    [Pg.147]    [Pg.74]    [Pg.156]    [Pg.72]    [Pg.72]    [Pg.72]    [Pg.72]   


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Conjugated heterocycles

Conjugation cross

Cross-conjugated

Pseudo-cross-conjugated heterocyclic mesomeric betaines

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