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Activation of bis-o-phenylene tetrasulfide to render it a practical benzodithiete equivalent for [4+2] cycloadditions with alkenes has been achieved with catalytic amounts of Mo(tfd)2(bdt) (tfd = S2C2(CF3)2; bdt = S2C6H4). Substituted 2,3-dihydro-1,4-benzodithiins are produced.