Robinson annelation of the 10-hydroxymethylene derivative of 1β,4,4-trimethyl-3α,5α-tricyclo[5.4.0.03,5]undec-7-en-9-one with methyl and ethyl vinyl ketones has yielded hydrocyclopropa[b]anthracenones whose products of reduction and cyclopropane scission are reported. The stereochemistry of the tetracycles and tricycles are analysed by the 13C n.m.r. spectral and c.d. methods.
F. Fringuelli, A. Taticchi, E. Wenkert, J. Bernassau, W. Klyne and D. N. Kirk, J. Chem. Soc., Perkin Trans. 1, 1980, 176 DOI: 10.1039/P19800000176
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