| 摘要 |
NEW MATERIAL:A color developing diketopyridine compound shown by the formulaI(X is a group shown by the formula II, a group shown by the formula III, a group shown by the formula IV, etc.; Y is 1-4C alkyl; 1-4C alkoxy, 1-4C dialkylamino, phenyl, benzyl, or condensed benzene ring; m is 0-4, R1 and R2 are 1-8C alkyl, phenyl, benzyl or cycloalkyl). EXAMPLE:2,6-Bis(N-methyl-N-cyclohexyl-4'-aminobenzoyl)pyridine. USE:Useful as a colorant for recording material such as pressure sensitive paper, thermosensitive paper, electrically-conductive thermosensitive paper, chalk paper, temperature-indicating ink, marking ink, crayon, etc. When it is brought into contact with an acidic material, it colors in dark yellow, orange, etc., and has high fastness to light. PROCESS:For example, a leuco compound shown by the formula V is reacted with acetic anhydride under heating to give a compound, which is oxidized with an oxidizing agent such as iron chloride, etc. to give an orthodiketopyridine compound shown by the formulaI. |
