Reaction of O-Alkyl-N-substituted Iminothiocarbonates with Bromoacetyl Bromide. A General Method for the Synthesis of 3-Substituted 1,3-Thiazolidine-2,4-diones
The amount of enzyme is determined by reacting an enzyme to be measured with a synthetic substrate having at least one structure to be specifically contacted with the enzyme and at least one spectral sensitizer structure, bringing either the reaction product having the spectral sensitizer structure or the unreacted synthetic substrate into contact with a silver halide emulsion layer, exposing the same to light of a spectral sensitizing wavelength region corresponding to the spectral sensitizer structure, developing the silver halide, and then measuring the optical density of developed silver and/or colored dye.
Silver halide light sensitive emulsion layer having enhanced photographic sensitivity
申请人:EASTMAN KODAK COMPANY
公开号:EP0786692A1
公开(公告)日:1997-07-30
A photographic element comprises at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of formula
Z-(L-XY)k
wherein:
Z is a light absorbing group;
L is a linking group containing a least one
C, N, S, or O atom; and
k is 1 or 2; and
XY represents a fragmentable electron donor moiety wherein:
1) XY has a an oxidation potential between 0 and about 1.4 V;
2) X is an electron donor group;
3) Y is a leaving group other than hydrogen; and
4) the oxidized form of XY undergoes a bond cleavage reaction to give the radical X• and the leaving fragment Y.
In a preferred embodiment the radical X• has an oxidation potential of ≤ -0.7 V.
感光元件包括至少一个卤化银乳剂层,其中的卤化银是用式 1 的化合物感光的。
Z-(L-XY)k
其中
Z 是光吸收基团
L 是连接基团,含有至少一个
C、N、S 或 O 原子的连接基团;以及
k 是 1 或 2;以及
XY 代表可碎裂的电子供体分子,其中
1) XY 的氧化电位在 0 至约 1.4 V 之间;
2) X 是电子供体基团
3) Y 是氢以外的离去基团;以及
4) XY 的氧化形式发生键裂反应,生成自由基 X- 和离去片段 Y。
在一个优选的实施方案中,自由基 X- 的氧化电位≤ -0.7 V。
Photobleachable composition, photographic element containing the composition and photobleach method
申请人:EASTMAN KODAK COMPANY
公开号:EP1134613A1
公开(公告)日:2001-09-19
A UV or visible-light sensitive photobleachable dye composition substantially free of polymerisable monomer comprising a photobleachable dye and an N-oxyazinium compound, a photographic element containing such a photobleachable composition, and a method for bleaching a photographic element.
Chiral <i>N</i>-(<i>o</i>-aryl)-thiazolidinediones: synthesis from rhodanines and investigation on rotational enantiomers by NMR spectroscopy
作者:Mehmet Karatas、Serap Koni、Ilknur Dogan
DOI:10.1139/cjc-76-3-254
日期:——
Sterically hindered N-(o-aryl)-rhodanines (a) (N-(o-aryl)-2-thioxo-4-thiazolidinones) have been synthesized and the N-(o-tolyl) and N-(o-chlorophenyl) derivatives have been converted to their dioxo analogs (b) (N-(o-aryl)-2,4-thiazolidine-diones). The chirality of the compounds in their conformational ground states was proved by detection of the diastereotopic protons or methyl groups at C-5 of the heteroring using H-1 and C-13 NMR spectroscopy. In the presence of the optically active auxiliary (S)-(+)-1-(9-anthryl)-2,2,2-trifluoroethanol the enantiomers of the racemic mixtures formed diastereomeric association complexes via H-bonding.
Some Possible Antihistaminics and Antispasmodics. II. Synthesis of Mannich Bases