cis-1,2-Bis(phenylsulphonyl)ehtylene (5) is found to be a reactive acetylene synthon in Diels–Alder reactions since, after cycloaddition to cyclopentadiene, cyclohexadiene, and cyclohepatatriene, and reduction with sodium amalgam, the corresponding bicyclodienes(6)–(8) are obtained in good yields.
O. De Lucchi and G. Modena, J. Chem. Soc., Chem. Commun., 1982, 914 DOI: 10.1039/C39820000914
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