Formazans, ortho-substituted in the C-aryl ring, have been prepared in two ways. These involve (a) coupling a highly electrophilic diazonium salt with an ortho-substituted benzylidene arylhydrazine and (b) replacement of bromine of a hydrazidic bromide by phenylhydrazine.
A. F. Hegarty and F. L. Scott, J. Chem. Soc. C, 1967, 2507 DOI: 10.1039/J39670002507
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