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benzidine

benzidine

benzidine Sentence Examples

  • Benzidine >>

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  • 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.

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  • With diazotized benzidine it gives Congo red.

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  • Gattermann, Ber., 1893, 26, p. 1844); in alcoholic alkaline solution it yields azoxybenzene; in acid alcoholic solution, benzidine; in ammoniacal alcoholic solution, phenylhydrazine.

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

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  • BENZIDINE (DIPARA-DIAMINO-DIPHENYL),NH 2 C 6 H 4 C 6 H 4 NH2, a chemical base which may be prepared by the reduction of the corresponding dinitro-diphenyl, or by the reduction of azobenzene with tin and hydrochloric acid.

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  • Benzidine crystallizes in plates (from water) which melt at '22' C., and boil above 360° C., and is characterized by the great insolubility of its sulphate.

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

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  • On the constitution of benzidine see G.

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  • 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.

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  • This reaction is known as the benzidine transformation.

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  • Benzidine.

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  • Many substitution derivatives are known: the monosubstitution derivatives being capable of existing in three isomeric forms. Of the disubstitution derivatives the most important are those derived from diparadiaminodiphenyl or benzidine.

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  • See Benzidine for diparadiaminodiphenyl.

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  • 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.

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  • With diazotized benzidine it gives Congo red.

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  • Gattermann, Ber., 1893, 26, p. 1844); in alcoholic alkaline solution it yields azoxybenzene; in acid alcoholic solution, benzidine; in ammoniacal alcoholic solution, phenylhydrazine.

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

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  • BENZIDINE (DIPARA-DIAMINO-DIPHENYL),NH 2 C 6 H 4 C 6 H 4 NH2, a chemical base which may be prepared by the reduction of the corresponding dinitro-diphenyl, or by the reduction of azobenzene with tin and hydrochloric acid.

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  • In this latter case hydrazo-benzene C 6 H 5 NH NH C 6 H 5 is first formed and then undergoes a peculiar re-arrangement into benzidine (see H.

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  • Benzidine crystallizes in plates (from water) which melt at '22' C., and boil above 360° C., and is characterized by the great insolubility of its sulphate.

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  • 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).

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

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  • On the constitution of benzidine see G.

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  • 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.

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  • This reaction is known as the benzidine transformation.

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  • Many substitution derivatives are known: the monosubstitution derivatives being capable of existing in three isomeric forms. Of the disubstitution derivatives the most important are those derived from diparadiaminodiphenyl or benzidine.

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  • See Benzidine for diparadiaminodiphenyl.

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