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Abstract
The reaction of 8-quinolinesulfonyl chloride (IIb) or 8-quinolinesulfinic acid (IVb) with hydrazine hydrate in diethylene glycol at 160° in nitrogen atmosphere gave 8, 8'-dithiodiquinoline (VIb) and 8-quinolinethiol (VIIb). VIIb was formed by the reduction of VIb with (H2)active which was generated by the thermal decomposition of hydrazine hydrate VIIb was oxidized to VIb by 8-quinolyl 8'-quinolinethiolsulfonate (Vb) which was produced by the reduction of IVb with hydrazine hydrate. On the basis of these facts, it was found that VIIb was the main product in the reaction of IIb or IVb with hydrazine hydrate when a large amount of hydrazine hydrate was used and the reaction time was prolonged, and VIb was produced mainly when a small amount of hydrazine hydrate was used or by the short reaction time.
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