Diphenyl (4′-(Aryldiazenyl)‎biphenyl-4-ylamino)‎(pyridin-3-yl)‎methylphosphonates as Azo Disperse Dyes for Dyeing Polyester Fabrics

Abstract EN

Diphenyl (4′-aminobiphenyl-4-ylamino)(pyridin-3-yl)methylphosphonate (1) was synthesized in 88% yield from reaction of pyridine-3-carboxaldehyde with benzidine and triphenylphosphite in the presence of titanium tetrachloride as a catalyst.

Diazotization of 1 gave the corresponding diazonium salt 2 which was coupled with several hydroxyl or amino compounds to give the corresponding azo dyes 3–8 in 82–88% yields after crystallization.

The dyes produced were applied to polyesters as disperse dyes and their fastness properties were elevated.