Pyryliumverbindungen—XII: Synthesen und eigenschaften von 1,2-benzoxalenen (indeno[2,1-b]pyranen) |
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Authors: | W Schroth GW Fischer |
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Institution: | Sektion Chemie der Martin-Luther-Universität, Halle-Wittenberg, Halle/Saale, DDR;Forschungsstelle für chemische Toxikologie der Akademie der Wissenschaften der DDR, Leipzig, DDR |
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Abstract: | Pseudoazulenes of the 1,2-benzoxalene type C (indeno2,1-b]pyranes) are accessible by two new ways: The title compounds 1–10 were synthesized by acid catalysed cyclodeamination of ketovinylated 2-piperidinoindenes F, the compounds 13–36 by deprotonation of 9H-indeno2,1-b]pyrylium salts L obtained from indan-2-ones and β-diketones. The aromatic nature of the pseudoazulene system is described in terms of various physical and theoretical results (electronic spectra, resonance energies, HMO calculations). |
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