Diphenyl (4′-(Aryldiazenyl)biphenyl-4-ylamino)(pyridin-3-yl)methylphosphonates as Azo Disperse Dyes for Dyeing Polyester Fabrics release_tbb45omsqne5vf2zhc3b6g6yf4

Abstract

Diphenyl (4′-aminobiphenyl-4-ylamino)(pyridin-3-yl)methylphosphonate<jats:bold>(1)</jats:bold>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<jats:bold>1</jats:bold>gave the corresponding diazonium salt<jats:bold>2</jats:bold>which was coupled with several hydroxyl or amino compounds to give the corresponding azo dyes<jats:bold>3</jats:bold>–<jats:bold>8</jats:bold>in 82–88% yields after crystallization. The dyes produced were applied to polyesters as disperse dyes and their fastness properties were elevated.
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