Abstract: The invention relates to a method for preparing an aqueous solution of glyoxylic acid by oxidation of an aqueous solution of glyoxal with oxygen or a gas containing oxygen, in the presence of a catalytic quantity of nitric acid and/or at least one nitrogen oxide, a strong acid not oxidizing glyoxal, and by maintaining conditions satisfying the equation KLa/Q>10, where KLa is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.
Type:
Grant
Filed:
January 21, 2009
Date of Patent:
June 17, 2014
Assignee:
Clariant Specialty Fine Chemicals (France)
Inventors:
François Bleger, Olivier Simon, Alain Schouteeten
Abstract: The invention relates to a method for producing metal complexes of formula (2) [MaLxXn]Ym (2), where M is a metal from the group consisting of Mn(II), Mn(III), Mn(IV), Fe(II), Fe(III) or Fe(IV), X is a coordinating compound selected from mono-, bi- or tri-charged anions or neutral molecules which can coordinate to a metal in mono-, bi- or tri-dentate form, Y represents a non-coordinating counter-ion which ensures charge equalization of the complex, L represents a ligand of formula (1) or the protonized or de-protonized form thereof, and a, x, n, m, R, R1, R2, R3 and z have the meanings described in claim 1. Said method is characterized in that the reaction of one or more ligands of formula (1) with an iron salt or manganese salt is carried out in an acetone/water mixture in a temperature range from 0 to 50° C.
Type:
Application
Filed:
October 6, 2011
Publication date:
April 24, 2014
Applicants:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE), CLARIANT FINANCE (BVI) LIMITED
Inventors:
Christian Sidot, Audrey Caron, Miriam Ladwig, Gerd Reinhardt
Abstract: The invention relates to the use of metal complexes comprising a ligand derived from 2-aryl-2-hydroxyacetic acid and a divalent or trivalent metal cation and to the use of the said ligands in dissolving divalent or trivalent metal cations in aqueous phase. The said complexes can be used to treat metal deficiencies in plants.
Type:
Grant
Filed:
May 21, 2007
Date of Patent:
February 12, 2013
Assignee:
Clariant Specialty Fine Chemicals (France)
Inventors:
Alain Schouteeten, Sébastien Jus, Claude Cathelineau
Abstract: The invention relates to a process for preparing ?-aminoacetals substantially in racemic form, comprising a step of oxidizing optically enriched ?-aminoacetals to the corresponding oximes, in the presence of a catalyst, and a step of reducing the oximes thus obtained.
Type:
Grant
Filed:
May 21, 2008
Date of Patent:
January 8, 2013
Assignee:
Clariant Specialty Fine Chemicals (France)
Abstract: The invention relates to aminoplast or phenoplast resins comprising the reaction product of the following compounds: a substituted or unsubstituted amine derivative or a substituted or unsubstituted phenol derivative; at least one glyoxal monoacetal; and glyoxylic acid, and also the compositions containing them and their uses as adhesives or binders.
Type:
Grant
Filed:
May 21, 2007
Date of Patent:
September 4, 2012
Assignee:
Clariant Specialty Fine Chemicals (France)
Abstract: A subject-matter of the present invention is a novel process for the synthesis of (E)-stilbene derivatives targeted at obtaining in particular resveratrol and piceatannol.
Type:
Grant
Filed:
July 25, 2007
Date of Patent:
January 24, 2012
Assignee:
Clariant Specialty Fine Chemicals (France)
Abstract: The invention relates to a process for preparing optically active ?-aminoacetals by resolution of a racemic mixture or of a mixture of enantiomers via the formation of diastereoisomeric salts, and also novel intermediates in the form of diastereoisomeric salts.
Type:
Application
Filed:
January 21, 2009
Publication date:
February 10, 2011
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: The invention relates to a method for preparing an aqueous solution of glyoxylic acid by oxidation of an aqueous solution of glyoxal with oxygen or a gas containing oxygen, in the presence of a catalytic quantity of nitric acid and/or at least one nitrogen oxide, a strong acid not oxidizing glyoxal, and by maintaining conditions satisfying the equation KLa/Q>10, where KLa is the total volumetric mass transfer coefficient and Q is the heat load liberated by the reaction per mole of glyoxal.
Type:
Application
Filed:
January 21, 2009
Publication date:
January 20, 2011
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: The invention relates to a process for the synthesis of stilbene derivatives of formula (I)-(E) or (I)-(Z) in which R represents hydrogen or an OH group, by deprotection in the presence of an aluminium halide and of a tertiary amine of a compound of formula (II)-(E) or (II)-(Z) in which A represents hydrogen or an OR?1 group, and R1, R2, R3 and R?1 independently represent an alkyl or aralkyl group.
Type:
Application
Filed:
September 23, 2008
Publication date:
December 23, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Inventors:
Jean-Claude Vallejos, Alain Schouteeten, Didier Wilhelm
Abstract: The invention relates to a process for separating glyoxylic acid starting from an aqueous reaction medium containing glyoxylic acid and hydrochloric acid, comprising a step of countercurrent steam stripping of the reaction medium in order to obtain, on the one hand, a gas phase containing the volatile hydrochloric acid and, on the other hand, a liquid phase containing the purified glyoxylic acid.
Type:
Application
Filed:
January 21, 2009
Publication date:
December 9, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: The invention relates to the use of metal complexes comprising a ligand derived from 2-aryl-2-hydroxyacetic acid and a divalent or trivalent metal cation and to the use of the said ligands in dissolving divalent or trivalent metal cations in aqueous phase. The said complexes can be used to treat metal deficiencies in plants.
Type:
Application
Filed:
May 21, 2007
Publication date:
November 18, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Inventors:
Alain Schouteeten, Sébastien Jus, Claude Cathelineu
Abstract: The invention relates to aminoplast or phenoplast resins comprising the reaction product of the following compounds: a substituted or unsubstituted amine derivative or a substituted or unsubstituted phenol derivative; at least one glyoxal monoacetal; and glyoxylic acid, and also the compositions containing them and their uses as adhesives or binders.
Type:
Application
Filed:
May 21, 2007
Publication date:
September 30, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: The invention relates to a process for preparing ?-aminoacetals substantially in racemic form, comprising a step of oxidizing optically enriched ?-aminoacetals to the corresponding oximes, in the presence of a catalyst, and a step of reducing the oximes thus obtained.
Type:
Application
Filed:
May 21, 2007
Publication date:
June 17, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: The invention relates to a process for the preparation of N-protected ?-aminoaldehydes by deacetalization of the acetal functional group of corresponding N-protected ?-aminoacetals using formic acid.
Type:
Application
Filed:
April 2, 2008
Publication date:
June 3, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)
Abstract: A subject-matter of the present invention is a novel process for the synthesis of (E)-stilbene derivatives targeted at obtaining in particular resveratrol and piceatannol.
Type:
Application
Filed:
July 25, 2007
Publication date:
January 7, 2010
Applicant:
CLARIANT SPECIALTY FINE CHEMICALS (FRANCE)