A method for the preparation of novel fluorescent 1,2,3 - triazole compounds of the 3 - phenylcumarins

摘要

1,207,864. Substituted triazolyl - coumarin compounds. SANDOZ Ltd. 3 Jan., 1968 [5 Jan., 1967], No. 371/68. Heading C2C. [Also in Divisions C3 and D1] Novel substituted triazolyl - coumarin compounds of general Formula I where R 1 and R 2 independently represent a hydrogen atom or an aliphatic, alicyclic, araliphatic, aromatic, halogen- or alkyl-substituted araliphatic, or halogen- or alkyl-substituted aromatic radical or a methoxyphenyl radical, or R 1 and R 2 together with the two carbon atoms of the triazole ring form a five or six membered cycloalkyl ring, which may have a benzene ring condensed on to it, and R 3 represents a hydrogen or halogen atom or an alkyl or alkoxy radical with up to six carbon atoms, are prepared by cyclizing a hydrazone oxime of the Formula II where R 1 , R 2 and R 3 are as above, by heating in the presence of a solvent and an anhydride of a low molecular weight fatty acid, preferably in the presence of a tertiary base. The compounds of the invention have optical-brightening properties (see Divisions C3 and D1).