Issue 23, 1995

Synthesis and properties of dimethano-bridged tetradehydro[21]-, -[23]- and -[25]annulenones

Abstract

Syntheses of 7,8,9,10-tetradehydro-1,6:11,16-dimethano[21]annulen-19-one 11, 7,8,9,10-tetradehydro-18-methyl-1,6:11,16-dimethano[21]annulen-19-one 12, 7,8,9,10-tetradehydro-1,6:11,16-dimethano[23]annulen-19-one 13 and 7,8,9,10-tetradehydro-1,6:11,16-dimethano[25]annulen-21-one 14 are described. The influence of an introduction of two methano-bridges upon the structure and tropicity of the tetradehydro-[21]-, -[23]- and -[25]annulenone ring systems is discussed in view of the 1H NMR and electronic spectra of these annulenones as well as those of the corresponding monocyclic annulenones.

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 1, 1995, 3027-3036

Synthesis and properties of dimethano-bridged tetradehydro[21]-, -[23]- and -[25]annulenones

J. Ojima, N. Hiraiwa, S. Kondo, K. Asano, C. Sakon, H. Higuchi, K. Inoue and G. Yamamoto, J. Chem. Soc., Perkin Trans. 1, 1995, 3027 DOI: 10.1039/P19950003027

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