Synthesis of benzimidazole derivatives. 11. Imidatricarbocyanines with substituents in the polymethine chain

In order to investigate their optical properties, imidatricarbocyanines of the benzimidazole series containing methyl, methoxy, and cyano groups as substituents in the polymethine chain have been synthesized.For communication 10, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 524–527, April, 1980.     

Synthesis of benzimidazole derivatives

Phenylhalides of 1-phenyl-2-methylbenzimidazole were synthesized and converted to a new type of imidacyanin dye with phenyl groups on both nitrogen atoms of the benzimidazole residue. The heretofore unknown imidadicarbocyanins were obtained from quaternary salts of 1-phenyl-2-methylbenzimidazole (or its derivatives) which contain electronegative substituents in the 5 position.See [1] for Communication II.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1559–1561, November, 1970.     

Reaction of 2-acetylbenzothiazole with 2-formylbenzothiazole

Products of condensation of 2-acetylbenzothiazole with 2-formylbenzothiazole and other aldehydes of the heterocyclic series were obtained, and their structures and properties were investigated. It is shown that some of them react with acids or alkalis to give dyes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 644–648, May, 1982.     

Synthesis of benzimidazole derivatives

Imidadicarbocyanines containing a chloro, bromo, or methyl group in the polymethine chain were synthesized in order to investigate their optical properties.See [1] for communication VI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 254–257, February, 1975.     

Synthesis of thiazole derivatives

By condensing aldehydes of the benzothiazole series with dimethylaniline, leuco-bases of dyes of the type of Malachite Green have been synthesized. The oxidation of these bases has given new analogs of Malachite Green containing benzothiazole nuclei; the main absorption maxima of the dyes have been determined.For Communication XXIV, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1037–1039, August, 1973.     

New 2-methylbenzimidazole derivatives

New 2-methylbenzimidazole derivatives with a methyl, ethyl, or phenyl group at position 1, and a hydroxymethyl, aldehyde, or ß-carboxyl group at position 5 are synthesized. Imidocyanine dyes with aldehyde and ß-carboxyl groups in the heterocyclic portions are obtained, and their main light absorption maxima determined.     

Synthesis of thiazole derivatives XXIII. 2-Methylbenzimidazoles with thiazole, benzothiazole, and quinoline groups as substituents

Derivatives of 1-phenyl-2-methylbenzimidazole, with nitrogen heterocycle groups thiazole, 4-substituted thiazole, benzothiazole, and quinoline, at position 5, are synthesized. The ethiodides of the new bases are used to prepare cyanine dyes: imidadimethinemero-, imidacarbo-, and, imidadicarbocyanines.For part XXII see [1].     

Synthesis of benzimidazole derivatives

New bases and quaternary salts — 2-methylbenzimidazole derivatives — containing 2-pyridyl residues as a substituent in various positions of the benzimidazole ring were synthesized. Benzimidazolium salts of a new type with hetaryl groups attached to both nitrogen atoms were obtained. Imidacyanines were synthesized from the quaternary salts of pyridyl-substituted 2-methylbenzimidazoles, and the chief light-absorption maxima of these dyes were determined.See [1] for communication IVTranslated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 687–690, May, 1972.