1-Methylindene, 3-methylindene, 1,3-dimethylindene, and 3,4,7-trimethylindene react with dimethyl acetylenedicarboxylate at room temperature (20 d) to give mainly the 1 : 1 adducts (5). The adduct from 4,4′, 7,7′-tetra-methyl-3,3′-bi-indene (1) is reformulated as (4); it is accompanied by a stereoisomer and a product derived by addition of three molecules of the dienophile to (1).
D. W. Jones, J. Chem. Soc., Perkin Trans. 1, 1979, 673 DOI: 10.1039/P19790000673
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