COLOR PHOTOGRAPHIC RECORDING MATERIAL CONTAINING NON- DIFFUSING ELECTRON DONOR PRECURSOR COMPOUNDS

摘要

5- or 6-membered ?-lactones of phenolic compounds, in which the phenyl ring carries a hydroxyl or amino group in its 2- or 4-position to the lactonized phenolic hydroxyl group and in which the lactone ring carries an electron accepting substituent, so that the lactone ring is readily cleavable at pH values of from 10 to 13 to form an electron donor compound (ED-compound) having a redox potential of less than +0.255 V determined against a normal colored electrode at pH 0 are useful ED precursor compounds for non-diffusing reducible color providing compounds.