Quinoxalines and their use in photographic processes

Details Quinoxalines and their use in photographic processes Quinoxalines and their use in photographic processes

C - Chemistry, Metallurgy

07

D

96/71, 260/265.9

C07D 241/40 (2006.01) C07D 241/42 (2006.01) G03C 1/76 (2006.01) G03C 7/00 (2006.01) G03C 7/28 (2006.01)

Patent

CA 1100503

Abstract of the Disclosure Quinoxalines of the formula Image , are provided, in which R1 and R2 independently are lower alkyl R3 is lower alkyl, -CH2OR5, -CH2NRR', -CH2OCO4, -CH2Cl, -CH2Br, -CH2SR, -CH2O(CH2)pOR, -CH2PO(OR5)2, -CH2PO(OR6)2, -CH2SO3R6, -O(CH2)mOR, -O(CH2)pSO3R6 or -(OCH2CH2)nOAr, R4 is hydrogen or lower alkyl if R3 is not lower alkyl, or is -OR, -NRR', -NHCOR, -NHCOAr', -NHSO2R5 or -NHSO2Ar', R and R' independently are hydrogen or lower alkyl, R5 is lower alkyl, R6 is hydrogen, an alkali metal cation or -?(R)4, Ar is aryl or sulphonated aryl, Ar' is aryl or substituted aryl, m is 3 or 4, n is 1 to 3 and p is 2 to 4. The quinoxalines are useful as bleach catalysts, especially as dye bleach catalysts, for the photographic silver dye bleach process.

278935

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