Benzidine Sentence Examples

The latter on reduction yields a diamino compound, the disulphonic acid of which on diazotization and coupling with a phenol, &c., gives valuable substantive cotton dyes after the type yielded by Benzidine.

With diazotized benzidine it gives Congo red.

It is used commercially for the preparation of aniline and of benzidine; and in perfumery (oil of mirbane).

Among such dyestuffs are chrysamine or flavophenine, obtained from salicylic acid and diazotized benzidine, and congo red obtained from sodium naphthionate and diazotized benzidine.

The Benzidine and Semidine Change.-Aromatic hydrazo compounds which contain free para positions are readily converted by the action of acids, acid chlorides and anhydrides into diphenyl derivatives; thus, as mentioned above, hydrazobenzene is converted into benzidine, a small quantity of diphenylin being formed at the same time.

This reaction is known as the benzidine transformation.

See Benzidine for diparadiaminodiphenyl.

Benzidine finds commercial application since its tetrazo compound couples readily with amino-sulphonic acids, phenol carboxylic acids, and phenol and naphthol-sulphonic acids to produce substantive cotton dyes (see Dyeing).