Disclosed is a photographic element comprising a light-sensitive silver halide emulsion layer having associated therewith a cyan “NB coupler” having the formula (I):
1
wherein
the term “NB coupler” represents a coupler of formula (I) that forms a dye for which the left bandwidth (LBW) using spin-coating is at least 5 nm less than that of the same dye in solution form;
Y is H or a coupling-off group;
each Z″ and Z* is an independently selected substituent group where n is 0 to 4 and p is 0 to 2;
W
2
represents the atoms necessary to complete a heterocyclic ring group; and
V is a sulfone or sulfoxide containing group;
provided that the combined sum of the aliphatic carbon atoms in V, all Z″ and all Z* is at least 8. The element exhibits improved cyan dye hue.
Syntheses of heterocyclic compounds. Part XIV. Oxazoles from the pyrolysis of aryl azides in a mixture of a carboxylic and polyphosphoric acid
作者:R. Garner、E. B. Mullock、H. Suschitzky
DOI:10.1039/j39660001980
日期:——
Aromatic azides with a para-substituent decompose thermally in a mixture of polyphosphoric and a carboxylic acid to give oxazoles, or in some case NO-diacyl o-aminophenols, in good yield. Various aspects of this nitrene mechanism are discussed.
Process for the synthesis of 2,5-dicarbonamidophenolic couplers and benzoxazole derivatives as intermediates
申请人:EASTMAN KODAK COMPANY
公开号:EP1113006A1
公开(公告)日:2001-07-04
Disclosed is a process for preparing 2,5-dicarbonamido phenol compounds comprising a step employing a 2-alkyl-6-nitro-benzoxazole to form a 2-alkyl-6-amino-benzoxazole in which the 2-alkyl group is unbranched at the a carbon. It also provides intermediate compounds useful in the process. The process provides a simple and safe way to prepare 2,5-dicarbonamido phenol compounds in good yield.