A. M. Osman

Heterocyclic compounds. VIII. Studies on oxazolophenoxazines

5H-Oxazolo[4,5-b]phenoxazine (5) was synthesized by the reaction of 3-amino-2-hydroxyphenoxazine hydrochloride (2) with formamide. A series of styryl-oxazolophenoxazines (9) were prepared by condensation of 2-methyl-5-acetyloxazolo[4,5-b]phenoxazine methiodide (8) with aromatic aldehydes. By contrast, 2-aryl-oxazolophenoxazines (14) were synthesized by reaction of 3-aminophenoxaz-2-one (1) with the appropriate aldehydes in the presence of an acid–base catalyst. The biological activities of some of these compounds were tested.

Spectrophotometric studies on some 2-styryl benothiazole cyanine dyes

Abstract The ultraviolet and visible absorption-spectra of some 2-styryl benzothiazole ethiodides have been studied in ethanol and different organic solvents. The bands observed are assigned to different electronic transitions liable to exist. The effect of substituents on the band position and intensity is discussed. The pKa values of the hydroxy derivatives have been determined.

SYNTHESIS OF NEW BIS(OXASTYRYL)CYANINE DYES

Die 1:1-molare Umsetzung des durc SeO2-Oxidation des 2,6-Dimethyl-Analogen erhaltenen Dialdehyds.