Syntheses of 3-aryl-5-( 6-( a-picolyl))rhodanines and 3-aryl-5- (2-pyridylmethylene )rhodanines and their dyeing performance on acetate and/or other fibres

3-Aryl-5-[6-( a-picolyl)]rhodanines (Hla-g) and 3-aryl-5-(2-pyridylmethylene)rhodanines (IVa,b,f,g) were. prepared by treatment of a-picoline N-oxide (I) with 3-aryl rhodanines (II) at 90°C in presence of acetic anhydride and their dyeing performance of polyester, polyacrylic and wool fibres was assessed. The effect of nature and orientation of substituents on the colour of these compounds was also studied. All the compounds showed good affinity towards polyester fibres followed by polyacrylic and wool fibres.