Tellurium Dithiocarboxylate Halides

Tellurium bis[dithiocarboxylates] lose one dithiocarboxylate group in reactions with equimolar amounts of chlorine, bromine, iodine, (V-chlorosuccinimide, or N-bromosuccinimide. The products, tellurium dithiocarboxylate halides, precipitate from the reaction mixtures . 

Tellurium tetrachloride and tellurium tetrabromide were converted to tellurium dithiocarboxylate halides in reactions with two or fewer molar equivalents of dithiocarboxylic acids1,2 or their piperidinium salts1. Reactions with a 3 1 molar ratio of the reagents (dithiocarboxylate/tellurium tetrahalide) were not carried out. 

Tellurium dithiocarboxylate halides reacted with piperidinium and sodium salts of dithiocarboxylic acids to give tellurium bisfdithiocarboxylates]1 (see p. 45). 

Tellurium dithiobenzoate halides and piperidinium or sodium dithiocarboxylates condensed at 20° in dichloromethane or a dichloromethane/ethanol mixture. When the aryl group in the piperidinium (sodium) dithiocarboxylate was not the same as that in the tellurium compound, all three possible tellurium dithiocarboxylates were formed. Their presence in the recrystallized products was confirmed by mass spectrometry. However, all attempts to isolate the unsymmetrical compounds in pure form failed1. 

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