Condensation of certain nitroaroyl and nitroarylsulphonyl chlorides with sulphamic or methylsulphamic acid in pyridine affords good yields of the corresponding nitroaroyl- or nitroarylsulphonyl-sulphamic acids, which may be reduced to amines without loss of the labile sulphonic acid group.
W. F. Beech, J. Chem. Soc. C, 1970, 515 DOI: 10.1039/J39700000515
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