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in benzene under inert gas; a suspension of the Na-salt of 1,2-benzodithiol was heated to 75°C; B2(NMe2)2Cl2 was added under stirring; 14 h; insoluble residue was removed; crystals from the filtrate were isolated and washed with pentane; further compounds were isolated by distillation and sublimation of the residue; elem. anal., mass spectroscopy;