写真用アニオン離脱ピラゾロンカプラーの開発と実用化

概要

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Two series of 5-pyrazolone couplers, in which pyrazolyl and ο-alkoxyarylthio group are substituted at the dye forming position as anionic leaving groups, have been developed for photographic color negatives and color papers, respectively.<BR>Realization of these couplers afforded the following three advantages, 1) saving of the amount of couplers 2) reduction of yellow stain in the color paper on storage, 3) retention of color balance even in formalin atmosphere.<BR>Couplers with pyrazolyl group have been synthesized by the reaction of 4-bromopyrazolone only with neutral 2 molar excess pyrazole, which acted not only as a nucleophile but also as a trapping agent of hydrogen bromide.<BR>Couplers with ο-alkoxyarylthio group have been selectively synthesized by the reaction of 4-unsubstituted pyrazolones with an arylsulfenyl chloride in aprotic polar solvents.
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