Photographic recording material and non-diffusing compounds to be used in the material which contains a photographically active group which can be split off

Claim 1

Photographic recording material having at least one light-sensitive silver halide emulsion layer and in association with said silver halide emulsion layer, a non-diffusing reducible compound which can be split to release a diffusible photographically useful compound, the non-diffusing reducible compound corresponding to the following formula I ##STR17## in which the substituents W, XR 2 , G--R 1 and E may be arranged in any positions in relation to each other and in which: R 0 represents the atoms required to complete a ring system comprising at least one aromatic or heteroaromatic ring; W represents a group which reduces the electron density in the ring at the position of E and is selected from the group consisting of a halogen atom, a cyano group, a nitro group, a nitroso group, a trifluoromethyl group, a quaternary ammonium group and an acyl group; m represents an integer of from 1 to 3; G represents a group from which R 1 can be split off under photographic development conditions; R 1 represents the residue of a diffusible photographically active compound; X represents an oxygen atom, a sulfur atom or the group --NR 3 --; R 2 represents hydrogen or a group which can be split off in alkaline medium, and E represents a reducible substituent selected from the group consisting of ##STR18## R 3 represents hydrogen, alkyl, aryl, a heterocyclic group or aralkyl, and the compound of formula I contains at least one substituent conferring diffusion resistance.