Abstract: This invention relates to an imaging element, such as a photographic or photothermographic element comprising a silver halide emulsion layer, wherein the element also comprises a compound of Structure I: wherein the substituents are as defined in the specification.

Abstract: This invention relates to an imaging element comprising an imaging layer having associated therewith a compound of Structure I: In the above Structure I, the substituents are as defined in the application. Such compounds have good reactivity and can by used to block photographically useful compounds such as developing agents until thermally activated under preselected conditions. Compounds according to the present invention are especially useful in color photothermographic imaging elements.

Abstract: Blocked photographically useful groups decompose thermally via a Lossen rearrangement reaction, including, for example, compounds represented by the following structure: 1

Abstract: This invention relates to an imaging element comprising an imaging layer having associated therewith a compound of Structure I: 1

Abstract: This invention relates to an imaging element comprising an imaging layer having associated therewith a compound of Structure I: In the above Structure I, the substituents are as defined in the application. Such compounds have good reactivity and can by used to block photographically useful compounds such as developing agents until thermally activated under preselected conditions. Compounds according to the present invention are especially useful in color photothermographic imaging elements.

Abstract: This invention relates to an imaging element, such as a photographic or photothermographic element comprising a silver halide emulsion layer, wherein the element also comprises a compound of Structure I: wherein the substituents are as defined in the specification.

Abstract: The invention provides a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a coupler based on a 1-aryl-3-arylpyrazol-5-one ring and represented by formula I: wherein the substituents are as described in the specification.

Abstract: Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a coupler based on a 1-aryl-3-arylpyrazol-5-one or a 1-aryl-3-alkylpyrazol-5-one ring and represented by formula I: ##STR1## wherein: X represents an aryl, alkyl, alkylamino, or arylamino group;Y can be carbon or sulfur; in is 1 when Y is carbon and 2 when Y is sulfur;R represents a halogen or an alkyl group; and o is 0 to 4, provided that two or more R substituents may join to form one or more additional rings;Z is either (a) an aryl group represented as Ar.sup.3 Q(n) where Q represents n independently selected substituents bonded to the Ar.sup.3 ring; and n is 0 to 5, provided that two or more Q substituents may join to form one or more additional rings or (b) an alkyl group;OAr.sup.4 is an aryloxy group; andP represents p independently selected substituents bonded to the OAr.sup.

Abstract: Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a pyrazol-5-one coupler bearing a 4-aryloxy coupling-off group containing a group capable of releasing a photographically useful group (PUG) wherein:(1) the pyrazol-5-one ring contains a 1-aryl substituent which in turn contains, in a position ortho to the bond linking it to the pyrazolone ring, a secondary carbonamido group or a secondary sulfonamido group;(2) the pyrazol-5-one ring contains either (a) a 3-aryl substituent which in turn contains substituents for which the sum of the Hammett's .sigma. constant values is -0.3 or higher or (b) a 3-alkyl substituent; and(3) the 4-aryloxy coupling-off group:(a) contains ring substituents selected so that the sum of the Hammett's .sigma. constant values for all substituents on the phenoxy ring is at least 0.

Abstract: The invention provides a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith an 1-arylpyrazol-5-one coupler bearing a 4-aryloxy coupling-off group containing a group capable of releasing a photographically useful group (PUG) wherein:(1) the 1-arylpyrazol-5-one ring contains a 3-aryl substituent which in turn contains substituents for which the sum of the Hammett's .sigma. constant values is at least 0, provide that two or more such substituents may join to form one or more additional rings; and(2) the 4-aryloxy coupling-off group:(a) contains ring substituents selected so that the sum of the Hammett's sigma constant values for all substituents on the aryloxy ring is at least 0.

Abstract: Photographic elements are described which contain a release compound that during photographic processing provides an imagewise distribution of a nucleophile which can react with a uniform distribution of a blocked dye moiety contained in the element to release an unblocked dye.