As a result of studies on the reaction mechanism involving the formation of
p, p′-dinitro-diphenyl disulfide (II) and
p, p′-dinitro-diphenyl sulfide (III) from the reaction of 2mol.
p-nitro-chlorobenzene (I) and 1mol. Na
2S
2, it was found that the compound (II), formed from (I) and Na
2S
2, was reduced further by Na
2S
2 to Na-salt of
p-nitrothiophenol (IV) to which (I) again reacted to form (III).
By the application of above theory, 2mol. (I) and 1mol. Na
2S were reacted in the presence of a small amount of Na
2S
2 and (III) was obtained with a good yield. In this case, (II) is first formed from (I) and Na
2S
2, to which Na
2S reacts to form (IV) and at the same time, Na
2S
2 is produced, this substance being repeatedly used in the first reaction. (IV) and (I) react to form (III).
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