SCHEDULED MAINTENANCE
10,11,12,13-Tetradehydro-9,14-dimethyl[14]-, 10,11,12,13-tetradehydro-9,14-dimethyl[16]annuleno[a]azulene and their 3-isopropyl derivatives have been synthesized. The effect of annelation of a 10π-azulene ring onto the monocyclic [4n+ 2]π- and [4n]π-electron systems is discussed on the basis of 1H NMR and electronic spectra.
H. Higuchi, J. Ojima, M. Yasunami, K. Fujimori, M. Ueno, M. Yoshifuji and G. Yamamoto, J. Chem. Soc., Perkin Trans. 1, 1994, 1167 DOI: 10.1039/P19940001167
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