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THIAZOLES

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Originally appearing in Volume V26, Page 845 of the 1911 Encyclopedia Britannica.
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THIAZOLES , in organic See also:

chemistry, a See also:series of heterocyclic compounds containing the grouping shown below; the re- placeable See also:hydrogen atoms in which are designated a, i and µ. They are prepared by condensing thio-amides with a-haloid See also:ketones or See also:aldehydes, the thio-See also:amide reacting as the tautomeric thio-imino See also:acid. Amino derivatives similarly result from thio-ureas and a-haloid ketones; the oxy derivatives from a-sulphocyanoketones by the See also:action of See also:caustic See also:alkali; and the carboxylic acids from chloro-aceto-acetic ester, &c. and thioamides. The thiazoles are somewhat basic in See also:character, and combine with the alkyl iodides to See also:form thiazolium iodides. Dihydrothiazoles, or thiazolines, are obtained by condensing See also:ethylene dibromides with thio-amides; by the action of $-haloid alkylamines on thio-amides (S. See also:Gabriel, Ber., 1891, 24, p. 783; 1896, 29, p. 2610) ; and by the action of See also:phosphorus pentasulphide on acyl-p-bromalkylamides (A. Salomon, Ber., 1893, 26, p. 1328). They are much less See also:stable than the thiazoles. The benzothiazoles are a series of weak bases formed by condensing carboxylic acids with ortho-aminothiophenols (A.

W See also:

Hofmann, Ber., 188o, 13, p. 1224), by See also:heating the acid anilides with See also:sulphur or by the oxidation of thio-anilides. On See also:fusion with caustic alkalis they decompose into their constituent aminothiophenol and acid. Derivatives of this See also:group are important as substantive See also:cotton dye-stuffs.

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