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Encyclopedia Britannica - Main :: THE-TOO |
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THIAZOLES , in organic chemistry , a series of heterocyclic compounds containing the grouping shown below; the re-placeable hydrogen atoms in which are designated a, i and . They are prepared by condensing thio-amides with a-haloid ketones or aldehydes, the thio-amide reacting as the tautomeric thio-imino acid. Amino derivatives similarly result from thio-ureas and a-haloid ketones; the oxy derivatives from a-sulphocyanoketones by the action of caustic
character , and combine with the alkyl iodides to form thiazolium iodides.Dihydrothiazoles, or thiazolines, are obtained by condensing ethylene dibromides with thio-amides; by the action of $-haloid alkylamines on thio-amides (S. Gabriel, Ber., 1891, 24, p. 783; 1896, 29, p. 2610) ; and by the action of phosphorus pentasulphide on acyl-p-bromalkylamides (A. Salomon, Ber., 1893, 26, p. 1328). They are much less stable
series of weak bases formed by condensing carboxylic acids with ortho-aminothiophenols (A. W Hofmann, Ber., 188o, 13, p. 1224), by heating
sulphur
caustic
cotton
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