The products obtained when α-(o-nitrophenylthio) acids are reduced by means of sodium borohydride and palladium-charcoal depend on (a) the reaction temperature,(b) the solvent,(c) the length of time in which the α-(o-nitrophenylthio) acid is in contact with the reducing agent, and (d) the nature of the substituents on the α-(o-nitrophenylthio) acid. By varying these conditions, benzothiazine hydroxamic acids (ie substituted 3, 4-dihydro-4- ...
![2-[(2-chlorophenyl)methylidene]-4H-1,4-benzothiazin-3-one Structure](https://image.chemsrc.com/caspic/375/54913-29-0.png)