The title compound (2b) and its dimethyl ester (2a) have been synthesised from the cycloadduct of 3-methoxy-3a-methyl-3aH-indene and dimethyl acetylenedicarboxylate; n.m.r. spectra and an X-ray crystallographic analysis of (2b) show that they are aromatic compounds.
T. L. Gilchrist, C. W. Rees, D. Tuddenham and D. J. Williams, J. Chem. Soc., Chem. Commun., 1980, 691 DOI: 10.1039/C39800000691
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