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Reaction of hydrazine hydrate with aroyl chloride and ammonium thiocyanate under the condition of solid-liquid phase transfer catalysis using polyethylene glycol-600 (PEG-600) as the catalyst yielded 1, 6-diaroyldithiohydrazodicarbonamides 3a—3h in good to excellent yield.
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Zhang et al. (1998) studied this question.
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