Eine einfache Synthese fur die 3a-Azaazulen-4-one 1 wird bcschriebcn. Ein Verglcich i hrer spektroskopischen Eigenschaften mit denen der Pyrrolizin-3-one 2 gestattet erste Aussagen iiber die BindungsverhPltnisse. 1 a reagiert mit stabilisierten Phosphoranen zu 4-Methylen-3aazaazulenen 15. Protonierung der Ketone 1 fiihrt zu den stark farbigen diatropen lonen 16.
Cyclic Compounds Containing Hetero-Bridge Atoms, IX1) 3a-Azaazulen-4-ones3a-Azaazulen-4-ones 1 were prepared in a simple manner. The nature of the Ti.-system in these compounds is discussed by comparison of their spectroscopic properties with those of the pyrrolizin-3-ones 2. Olefination of 1 a with stabilised phosphoranes yielded 4-methylene-3a-azaazulenes 15. Protonation of the hetarenes 1 leads to the high coloured diatropic ions 16.
Die N-bruckenkopf-bicyclischen lrnide 1 und 2 reagieren rnrt Triphenylphosphio-dtlioxycarbonylmethylen und Triphenylphospbm-cyanmethplen unter Mono-und Bi~-olefinierung (3-6). Die Umsetzung gelingt bevorzugt an 5-Ring-Carbonylgruppen. Die Konfigurationen der synthetisicrtcn Verbindungen wcrden durcli Jhre Spektren bewiesen
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