Azothiazoles


Oxidation of 2-hydrazinothiazoles with FeCls gives 2-azothiazoles in good yields (515, 521, 538-540). This oxidation may also be performed with dilute nitric acid (523, 541). However, the reaction of concentrated  [c.102]

Highly colored, they have been used to dye cellulose acetate (552) and acrylic fibers (553). Cationic dyes prepared from 2-azothiazoles by simple alkylation on the ring nitrogen (552) have been used increasingly with the introduction of polyacrylonitrile fibers with basic sites that can be colored with such dyes (554).  [c.105]

The preparation of 5-azothiazoles uses the nucleophilic character of C-5 carbon in reaction with the appropriate diazonium salt (402, 586). These 5-azothia2oles form 1 1 complexes with Ag (587). 2-Amino-4-methyl-5-arylazothiazoles give reduction waves involving two-electron transfer the Ej/ values correlate to the angle between the thiazole and phenyl rings (588).  [c.108]

TABLE VI-13. ANALYTICAL USES OF 2-AZOTHIAZOLE (A) AND 2-AMINOTHIAZOLE (Bl DERIVATIVES  [c.155]


See pages that mention the term Azothiazoles : [c.105]    [c.105]    [c.107]    [c.107]   
See chapters in:

Thiazole and its derivatives Ч.2  -> Azothiazoles


Thiazole and its derivatives Ч.2 (1979) -- [ c.105 , c.153 , c.170 , c.271 , c.272 , c.273 ]