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The cleavage of binuclear titanocene polysulfide complexes [reaction (a)] is useful in the synthesis of the title compound 1. Reaction probably occurs in an analogous fashion with many elemental dihalides (ECl2 or RxEC12) and should therefore open the way to a wide variety of new titanocene complexes. Compound 1 contains a bimetallic heterocycle that functions as a transfer reagent for S4AsCH3.