The cycloaddition of cycloheptatrienethione (I) with maleic anhydride gives a rare [π8s+π2s] type of adduct (II), while with dimethyl acetylenedicarboxylate it gives an unusual rearrangement product (III).
T. Machiguchi, M. Hoshino, S. Ebine and Y. Kitahara, J. Chem. Soc., Chem. Commun., 1973, 196 DOI: 10.1039/C39730000196
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