Verwendung von Farbkupplern zur Erzeugung purpurroter Farbstoffbilder in farbphotographischem Material

摘要

1,140,898. Substituted pyrazolones. EASTMAN KODAK CO. 14 April, 1966 [24 May, 1965], No. 16311/66. Heading C2C. [Also in Division G2] Novel compounds of Formula II wherein n represents 1 or 2. R2 represents an alkyl or substituted alkyl group, a monocyclic alkyl group, a bicyclic alkyl group, an aryl or substituted aryl group, a heterocyclic or substituted heterocyclic group, a carbamyl group or a thiocarbamyl group, R3 represents a hydrogen atom, an alkyl or substituted alkyl group, an aryl or substituted aryl group, a heterocyclic group substituted or unsubstituted, an etherified hydroxy or thiol group, an amino or substituted amino group, an acylamino group, a carbamyl group, a sulphamyl group, a ureido group, a thioureido group, or a guanidino group, and R4 represents a monovalent aryl or substituted aryl group when n represents 1, and a divalent aryl or substituted aryl group when n represents 2, are prepared either by reacting ethyl α-aryloxy aceto-acetate, ethyl α - aryloxy # - methyl thio - # - anilino acrylate or diethyl α-aryloxyoxaloacetate with a hydrazine of formula R2NH-NH 2 or by reacting the sodium salt of the 4-hydroxy-5- pyrazolone with a mono-fluorinated R4, which fluoro benzene compound is activated by electron-withdrawing substituents attached to the benzene ring.