Certain solid dye bases which are precursors of acrylic fiber dyes and which contain a tertiary nitrogen atom are effectively quaternized in high yield and purity in a "dry state" quaternization process comprising contacting the dye base with an essentially stoichiometric amount of an alkylating agent at a temperature of 30.degree.-90.degree. C., said alkylating agent being added to said dye base gradually at a rate such that the reaction mixture is a free-flowing solid throughout the reaction.
Synthesis, kinetics, structure-activity relationship and in silico ADME studies of new diazenyl azo-phenol derivatives against urease, SARS-CoV-2 main protease (Mpro) and ribosomal protein S1 (RpsA) of Mycobacterium tuberculosis
FTIR spectra, while presence of OH peak in spectral range of 15–10 ppm and aromatic protons in the region of 8.0–6.0 ppm and disappearance of NH2 peak in 5.0–4.0 spectral region in 1H NMRspectra confirms the synthesis of new diazenyl azo-phenol derivatives. Similarly, appearance of carbon attached with -N=N- group in the range of 149–144 ppm, C−OH in the range of 164–162 ppm, C−N of pyridine ring