Eastman-kodak Company

Michael E Campbell

Chang K Kim

Lee J Fleckenstein

Francesco DeBellis

Robert E Ross

Mono-acylated hydrazines are prepared in high yield by reaction of a hydrazine salt with an azole derivative of acyl halide in the presence of a strong base. Useful hydrazine salts include those of the formula RNHNH.sub.2 .multidot.HX, where R is alkyl, aryl, aralkyl, acyl, aroyl, heterocyclic or heteroaryl, and HX is a mineral or organic acid. Useful azole derivatives include those of the formula R'CO--A, where R' is alkyl, aryl, aralkyl, heterocyclic or heteroaryl and A is an azole radical such as pyrrole, imidazole, pyrazole, triazole, tetrazole, indole or benzimidazole.

Selective monoacylation of substituted hydrazines

Photographic elements, diffusion transfer assemblages and processes are described which employ a nondiffusible, redox, dye-releasing compound comprising a ballasted, sulfonamidophenol or sulfonamidonaphthol compound having a dye moiety attached thereto through the sulfonamido group of the compound, the sulfonamido group being located in a position which is conjugated with respect to the position of the hydroxy group of the compound, and wherein

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Kendall, NY, United States of America

Michael E Campbell