Novel 2-phenyl-3-{4'-(N-(4"-aminophenyl)carbamoyl)-phenyl}- -quinazoline-4(3H)one-6-sulphonic acid based mono azo reactive dyes

A series of new heterocyclic mono azo reactive dyes 7a-m were pre- pared by diazotization of 2-phenyl-3-{4'-(N-(4"-aminophenyl)carbamoyl)-phe- nyl}-quinazoline-4(3H)-one-6-sulphonic acid (3) and coupling with various cy- anurated coupling components 6a-m and their dyeing performance on silk, wool and cotton fibres was assessed. These dyes were found to give a variety of colour shades with very good depth and levelness on the fibres. All the com- pounds were identified by conventional method (IR and 1 H-NMR) and elemen- tal analyses. The percentage dye bath exhaustion on different fibres was rea- sonably good and acceptable. The dyed fibre showed moderate to very good fastness to light, washing and rubbing. Keyword: quinazoline-4(3H)-one; mono azo reactive dyes; dyeing; fastness properties.