Benz indolizines

Benzimidazolo[l,2-c]thiatri azoles synthesis, 6, 612 Benz[cd]indazole antiaromaticity, 5, 208 Benz[cd]indazole, dihydroaromaticity, 5, 208 Benz[e]indolizine synthesis, 4, 466 Benzipiperylon biological activity, 5, 296 Benz[/]isoindoles synthesis, 4, 266... 

Charge distributions and bond orders of the cation and anion of 2//-benz[crf]azulene, on the other hand, are dissimilar. The seven-membered ring of the cation is delocalized, containing most of the positive charge, while that of the anion 87 is localized and the negative charge resides mainly in the delocalized indenyl moiety. A delocalized indolizine part with a localized butadiene bridge in the isoelectronic cycl-... 

Benz[a]indolizine ring. Piperidine added with stirring to a mixture ofN-[(2,4,6-trinitrophenyl)phenacyl]pyridinium betaine and dimethyl sulfoxide, allowed to stand 3 hrs. with occasional stirring 6-benzoyl-7,9-dinitrobenz[a]indolizine. Y 96%. F. e. s. W. Augstein and F. Krohnke, A. 697, 158 (1966). 

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