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US5260431A Nitroanilinesulfonic acids and the preparation of phenylenediaminesulfonic acids 失效
硝基苯磺酸和苯二胺磺酸的制备

Nitroanilinesulfonic acids and the preparation of
phenylenediaminesulfonic acids
摘要:
Nitroanilinesulfonic acids of the formula ##STR1## where R is C.sub.1 -C.sub.4 -alkyl are prepared by sulfonation of 3-nitro-N-alkylanilines using oleum, and are reduced to 3-(N-alkylamino)aniline-4-sulfonic acids.
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