Abstract Aminophenyl-X-azolopyridines (X= O, S, NH) are interesting intermediates for the synthesis of disperse azo dyes and, provided the pyridine nitrogen is quaternized, of their cationic counterparts. A set of novel amines and nitro derivatives is described, and their physical properties and spectral parameters are discussed in comparison with those of analogous compounds. Some dyes in the oxazole series function as probes of the ...
![2-(p-nitrophenyl)thiazolo[5,4-b]pyridine Structure](https://image.chemsrc.com/caspic/412/121717-37-1.png)
![2-(m-nitrophenyl)thiazolo[5,4-b]pyridine Structure](https://image.chemsrc.com/caspic/408/121739-78-4.png)