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Class 562/604 - Preparation by dehalogenation


Subclass of Class 562 - Organic compounds -- part of the class 532-570 series
Definition: Processes wherein the acid is prepared by reducing the halogen
No. of patents: 8
Last issue date: 01/24/2012


NumberTitleIssue Date
8101798Manufacture of substantially pure monochloroacetic acid
A process for the manufacture of substantially pure monochloroacetic acid from a liquid chloroacetic acid mixture comprising monochloroacetic acid and dichloroacetic acid, in particular in an amount of 2 to 40 percent by weight, wherein said mixture, further mixed w...
01/24/2012
6906219Method for preparing bromodifluoroacetic compounds
The invention relates to a method for preparing bromodifluoroacetic compounds which comprises converting a 1,1-difluoro-1,2-dibromodihaloethane with oleum having 50-70% SO3 to a bromodifluoroacetyl halide (bromide or chloride) and then in reacting the lat...
06/14/2005
6509495Selective hydrodehalogenation method
The invention concerns a selective hydrodehalogenation method characterised in that it comprises a step which consists in contacting a substrate including a sp 3 hybridisation carbon atom bearing an electro-attracting group and at least a fluorine atom, a...
01/21/2003
5756840Process for the preparation of a particularly pure monochloroacetic
The present invention relates to a process for the preparation of a particularly pure monochloroacetic acid, in which, in a first step, a hydrogenation of a mixture of mono- and dichloroacetic acid is carried out to a residual content of dichloroacetic ac...
05/26/1998
5455376Process for the preparation of aliphatic omega-difluorocarboxyl compounds
Aliphatic ω-difluorocarboxyl compounds are prepared in an economic manner from aliphatic ω-monohalogeno-difluorocarboxyl compounds by bringing the latter into contact with hydrogen in the presence of a catalyst which is applied to an inert support mater...
10/03/1995
5191118Catalytic dehalogenation of alpha-halogenated carboxylic acids/esters
The alpha-halogenated carboxylic acids/esters are dehalogenated by reaction with hydrogen in the presence of a catalytically effective amount of (i) a Group VIII precious metal catalyst and (ii) either sulfur or a sulfur compound, or (iii) a novel preciou...
03/02/1993
4172957Production of monochloroacetyl chloride and monochloroacetic acid by hydration of trichloroethylene
Continuous process for the production of monochloroacetyl chloride accompanied, if the need should arise, by monochloroacetic acid, from trichloroethylene and/or 1,1,1,2-tetrachloroethane by reaction for hydration of trichloroethylene and/or 1,1,1,2-tetra...
10/30/1979
4141895Hydroxyquinazolines and their use as intermediates for pharmaceutical agents
6-Substituted-2-halofluoromethyl-1,2-dihydro-2-hydroxy-1-methyl-4-phenylqui nazolines and their use as intermediates in the preparation of 3-fluorobenzodiazepines, which are useful as tranquilizers, muscle relaxants and sedatives....
02/27/1979
 
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