Imaging element containing a blocked photographically useful compound

A photographic, photothermographic, or thermographic imaging element comprising an imaging layer having associated therewith a compound of Structure III:

• wherein:
• Z is OH or NR2R3, where R2 and R3 are independently hydrogen or a substituted or unsubsidized alkyl group or R2 and R3 are connected to form a ring;
• R5, R6, R7, and R8 are independently hydrogen, halogen, hydroxy, amino, alkoxy, carbonamido, sulfonamido, alkylsulfonamido or alkyl, or R5 can connect with R3 or R6 and/or R8 can connect to R2 or R7 to form a ring;
• T is a substituted or unsubsidized alkyl, cycloalkyl, aryl or six-membered heterocyclic group, t is 0, 1, or 2, with the proviso that when X is a sulfonyl group, t is 1 or 2, and when t is 2, the two T groups can combine to form a ring;
• R12 is hydrogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group or R12 can combine with T or W to form a ring;
• X is an electron-withdrawing group;
• Y is C, N, O or S;
• X is divalent, a is 1 or 2 and b is 1;
• W is hydrogen, halogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group, or W can combine with T to form a ring, w is 0 to 3 when Y is C, w is 0-2 when Y is N, and w is 0-1 when Y is O or S, when w is 2, the two W groups can combine to form a ring, and when w is 3, two W groups can combine to form a ring or three W groups can combine to form bicyclic substituent.

A photographic, photothermographic, or thermographic imaging element comprising an imaging layer having associated therewith a compound of Structure I:

• wherein:
• PUG is a developing agent;
• LINK 1 and LINK 2 are linking groups;
• TIME is a timing group;
• l is 0 or 1;
• m is 0, 1, or 2;
• n is 0 or 1;
• Y is C, N, O or S;
• X is an electron-withdrawing group;
• W is hydrogen, halogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group, or W can combine with T or R12 to form a ring, w is 0 to 3 when Y is C, w is 0-2 when Y is N, and w is 0-1 when Y is O or S, when w is 2, the two W groups can combine to form a ring, and when w is 3, two W groups can combine to form a ring or three W groups can combine to form a bicyclic substituent;
• R12 is hydrogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group or R12 can combine with T to form a ring;
• T is a substituted or unsubsidized alkyl, cycloalkyl, aryl or six-membered heterocyclic group, t is 0, 1, or 2, with the proviso that if X is a sulfonyl group and a and l are each 1 and m and n are each 0, then t is 1 or 2;
• and if t is 2 the two T groups can combine to form a ring;
• X is divalent, b is 1 and a is 1 or 2;
• where LINK 1 and LINK 2 is independently represented by the following structure:
• wherein
• X′ is carbon or sulfur;
• Y′ is oxygen, sulfur or N—R1, where R1 is substituted or unsubsidized alkyl or substituted or unsubsidized aryl;
• p is 1 or 2;
• Z is carbon, oxygen or sulfur;
• r is 0 or 1;
• with the proviso that when X′ carbon, both p and r are 1, when X′ is sulfur, Y′ is oxygen, p is 2 and r is 0;
• # denotes the bond to PUG for LINK 1 or TIME for LINK 2;
• and
• $ denotes the bond to TIME for LINK 1 or T(t) substituted carbon for LINK 2.

A Photographic or photothermographic imaging element comprising an imaging layer having associated therewith a compound of Structure I:

• wherein:
• PUG is a photographically useful group;
• LINK 1 and LINK 2 are linking groups;
• TIME is a timing group;
• I is 0 or 1;
• m is 0, 1, or 2;
• n is 0 or 1;
• Y is C, N, O or S;
• X is an electron-withdrawing group;
• W is hydrogen, halogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group, or W can combine with T or R12 to form a ring, w is 0 to 3 when Y is C, w is 0-2 when Y is O or S, when w is 2, the two W groups can combine to form a ring, and when w is 3, two W groups can combine to form a ring or three W groups can combine to form a ring that is a an aromatic group or a bicyclic substituent;
• R12 is hydrogen, or a substituted or unsubsidized alkyl, cycloalkyl, aryl or heterocyclic group or R12 can combine with T to form a ring;
• T is a substituted or unsubsidized alkyl, cycloalkyl, aryl or six-membered heterocyclic group, t is 0, 1, or 2, and if t is 2 the two T groups can combine to form a ring;
• X is divalent, is 2;
• and b is 1;
• and
• where LINK 1 and LINK 2 is independently represented by the following structure:
• wherein
• X′ is carbon or sulfur;
• Y′ is oxygen, sulfur or N—R1, where R1 is substituted or unsubsidized alkyl or substituted or unsubsidized aryl;
• p is 1 or 2;
• Z is carbon, oxygen or sulfur;
• r is 0 or 1;
• with the proviso that when X′ is carbon, both p and r are 1, when X′ is sulfur, Y′ is oxygen, p is 2 and r is 0;
• · denotes the bond to PUG for LINK 1 or TIME for LINK 2;
• and
• $ denotes the bond to TIME for LINK 1 or T(t) substituted carbon for LINK 2;
• and
• wherein PUG is a development inhibitor, bleach accelerator, bleach inhibitor, inhibitor releasing developer, dye precursor, developing agent, silver ion fixing agent electron transfer agent, silver halide solvent, silver halide complexing agent, reductone, image toner, pre-processing image stabilizer, nucleator, or precursor thereof.