Arsenesulphinic acids were used, in acidic media, as protecting reagents for the C-nitroso-group against reduction and condensation, leading to a non-reducible hydroxylamine; deprotection is effected by basic hydrolysis.
A. Darchen and C. Moinet, J. Chem. Soc., Chem. Commun., 1976, 820a DOI: 10.1039/C3976000820A
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