Synthesis of 3-Cyano-6-hydroxy-5--2-pyridones and Their Application for Dye Diffusion Thermal Transfer Printing
New fluorine-containing azopyridone dyes, 3-cyano-6-hydroxy-5--2-pyridones, have been synthesized.Though the introduction of a long perfluoroalkyl group lowered film forming ability and sensitivity, 5-- and 5--3-cyano-4-methyl-6-hydroxy-2-pyridones showed good photostability.