ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Acid-base equilibriums of several azo compounds in dimethylsulfoxide. II. Study of several phenylazo and naphthylazo derivatives of 7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzothiazoles in DMSO and their use for titrations in DMSO
E. Kozáková, E. Kuchár, and P. Majer
Lehrstuhl für Analytische Chemie der Naturwissenschaftlichen Fakultät
an der Komenský-UniversitäU 801 00 Bratislava
Abstract: Acid-base properties of the following five substituted phenylazo compounds of
7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazole: of l-(7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazolyl-2-azo)-4-hydroxy 2,5-dimethylbenzene (DTA/), of l-(7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazolyl-2-azo)-4-hydroxy-2,6-dimethylbenzene (DTA II), of 1-(7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazoIyl-2-azo)-4-hydroxy-2-methyl-5-isopropylbenzene
(DTAIII), of 1-(7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazolyl-2-azo)-2-hydroxy-4,5-dimethyIbenzene
(DTA IV) and of 1-(7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzthiazolyl-2-azo)-2-naphthol
(DTA V) in dimethyl sulfoxide (DMSO) are described.
Dissociation constants of these compounds and molar absorption coefficients of
particular forms in DMSO were determined by the spectrophotometric method.
Compounds DTA 1—DTA V can be utilized as acid-base indicators for the
determination of bases in DMSO.
Full paper in Portable Document Format: 303a366.pdf (in German)
Chemical Papers 30 (3) 366–376 (1976)