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.
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Journal of the Chemical Society, Chemical Communications
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