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US 5,405,969 AGranted
Manufacture of thioether compounds
AssigneeEastman Kodak Company
InventorsCharles W. Wright, Joan C. Potenza, John E. Leary, Jr., Chang K. Kim
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AssigneeEastman Kodak Company
InventorsCharles W. Wright, Joan C. Potenza, John E. Leary, Jr., Chang K. Kim
Estimating the term…
The invention provides a process for making a thioether compound having the formula: A--S--R comprising reacting: (1) Compound I having the formula: A--H (I) where A comprises a carbon atom bonded to H where that carbon is either capable of ionizing to a nucleophilic state or is conjugated to such an atom, with (2) Compound II having the formula: H--SR or RSSR (II) wherein R is selected from the group consisting of: (a) a substituted or-unsubstituted aryl group or alicyclic group, said groups being carbocyclic or heterocyclic, and (b) a thiocarbonyl group, in the presence of a base and an oxidizing agent that is free of reactive halogen and that is capable of oxidizing H--SR to RSSR.
A process for making a thioether compound having the formula:
A process for making a compound capable of coupling with an oxidized photographic color developer and containing a coupling group (COUP) and a coupling-off group (COG), comprising reacting Compound I, which is a compound capable of coupling with an oxidized color developer and having a group that is either capable of ionizing to a nucleophilic state or that is conjugated to such a group, with Compound II, which is a disulfide or thiol of a group corresponding to the desired COG or a precursor of either, in the presence of a base, an oxidizing agent free of reactive halogen, and a solvent.
A process for making a compound capable of coupling with an oxidized photographic color developer and containing a coupling group (COUP) and a coupling-off group (COG), comprising reacting Compound I, which is a 1-aryl-2-pyrazolin-5-one compound having a formula corresponding to the desired COUP and having two hydrogen atoms on the carbon at the 4-position, with Compound II, which is a disulfide or thiol of a group corresponding to the desired COG or a precursor of either, in the presence of a base, an oxidizing agent free of reactive halogen, and a solvent.
A process for making a compound capable of coupling with an oxidized photographic color developer and containing a coupling group (COUP) and a coupling-off group (COG), comprising reacting Compound I with Compound II in the presence of a base, an oxidizing agent, and a solvent, wherein Compound I has a formula selected from the group consisting of:
Dependencies are inferred from the claim text.