abstract |
A method of preparing an isoindolenone pigment represented by the general formula WHEREIN X is a halogen atom, n is 0 or an integer of 1 - 4, and R is a direct bond, divalent aromatic residue or divalent heterocyclic residue, WHEREIN A COMPOUND REPRESENTED BY THE GENERAL FORMULA WHEREIN X, n and R are as defined above, is subjected to intramolecular dehydrocondensation. |