From Tellurium Tetrahalides

Tellurium tetrachloride and tellurium tetrabromide reacted with four molar equivalents of dithiocarboxylic acids or their piperidinium salts. Tellurium bis[dithiocarboxylates] were formed f However, the reaction between tellurapentathionate and dithiocarboxylates is the preferred method for the preparation of tellurium bis[dithiocarboxylates].  

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