Inventor: Wolfgang Siegel

Address: Limburgerhof, DE
No. of patents: 52
Last patent issue date: 01/15/2013

Number	Title	Issue Date
8354558	Process for diastereoselective conversion of chiral imines Diastereoselective conversion of chiral imines of the formula I to amines of the formula II where the R1 to R4 radicals are each as defined in the description and R1 and R2 are di...	01/15/2013
8173844	Method for producing O-alkylated cyclic aminoalcohols A process for preparing O-alkylated amino alcohols of the formula (I) by reacting N-unsubstituted or N-monosubstituted amino alkoxide salts with alkyl halides, the amino alkoxide salts being formed by means of alkoxides ...	05/08/2012
8044166	Process for preparing pentamethylene 1,5-diisocyanate The present invention relates to a process for preparing pentamethylene 1,5-diisocyanate, to pentamethylene 1,5-diisocyanate prepared in this way and to the use thereof. ...	10/25/2011
7935229	Extraction of nickel (0) complexes from nitrile mixtures with reduced rag formation A process for extractively removing homogeneously dissolved catalysts from a reaction effluent of a hydrocyanation of unsaturated mononitriles to dinitriles with a hydrocarbon H, including performing the steps of a) concentrating the reaction effluent before step b)...	05/03/2011
7851656	Method for producing organic phosphorous compounds containing halogens Method of producing compounds of the general formula XPR2(OR1) Ia where X is chlorine, bromine or iodine and R1 is an organic radical, by reacting compounds of the general formula X2PR	12/14/2010
7777068	Ni(0) -containing catalyst system A system comprising a) Ni(0) b) from 4 to 10 mol per mol of Ni(0) in a) of a compound (I) of the formula P(X1R1)(X2R2)(X3R3) (I) ...	08/17/2010
7767852	Method for the separation of acids from chemical reaction mixtures by means of ionic fluids Process for preparing aminodihalophosphines, diaminohalophosphines, triaminophosphines, phosphorous ester diamides, aminophosphines, diaminophosphines, phosphorous ester amide halides and aminophosphine halides with elimination of an acid in the presence of an auxil...	08/03/2010
7700795	Use of azeotropically dried nickel(ii) halogenides A process is described for preparing a nickel(0)-phosphorus ligand complex containing at least one nickel(0)central atom and at least one phosphorus ligand, which comprises reducing a nickel(II) halide dried by azeotropic distillation in the presence of at least one...	04/20/2010
7566800	Homogeneous isomerization of cis-2-pentene nitrile to form 3-pentene nitrile The invention relates to a method for isomerization of pentene nitrile in an educt flow, wherein isomerization is performed on a homogeneously dissolved catalyst. ...	07/28/2009
7550407	System suitable for the hydrocyanation of olefinically unsaturated compounds A system which is suitable as a catalyst for the hydrocyanation of olefinically unsaturated compounds and comprises a) Ni(0) b) a compound which complexes Ni(0) as a ligand and contains trivalent phosphorus, c) a Lewis acid	06/23/2009
7528275	Method for the production of adipodinitrile by hydrocyanation of 1,3-butadiene A process is described for preparing adiponitrile by hydrocyanating 1,3-butadiene over a catalyst, by, in a first process step, hydrocyanating 1,3-butadiene to 3-pentenenitrile over at least one nickel(0) catalyst, and, in a second process step, hydrocyanating 3-pen...	05/05/2009
7521575	Sterically hindered chelate phosphinite-phosphite ligand, catalyst, comprising at least one nickel(0) complex stabilized by said ligand and method for production of nitriles The invention relates to phosphinite phosphites I of formula 1, 2, 3, 4, 5 or 6 and mixtures thereof, wherein R1, R2, R4 independently represent an alkyl or alkylene group with 1 to 8 carbon atoms, provided that at least one of the groups R1, R2, R4 is different fro...	04/21/2009
7498451	Obtaining an aliphatic dialdehyde Monoacetal The invention relates to a process for obtaining a pure aliphatic dialdehyde monoacetal by reaction of the corresponding aliphatic dialdehyde or a precursor of the corresponding aliphatic dialdehyde with one or more aliphatic mono- or polyhydric alcohols while disti...	03/03/2009
7385087	Method for producing a-(3-arylthio)-acetophenones A process for preparing α-(3-arylthio)acetophenones of the general formula I where the substituents R1 and R2 are each independently C1-C6-alkyl or an optionally substituted phen...	06/10/2008
7361778	Method for the isomerization of cis-2-pentenenitrile to form trans-3-pentenenitrile A process for isomerizing cis-2-pentenenitrile to trans-3-pentenenitrile in the presence of aluminum oxide as a catalyst, wherein the aluminum oxide has a BET surface area of at least 50 m2/g. ...	04/22/2008
7358396	Preparation of optically active amines A process for preparing optically active amines, a process for preparing racemic amines which can be resolved using optically active carboxylic acids or enzymes, and racemic and optically active amines and optically active amides are described. ...	04/15/2008
7351339	Method for the separation of acids from chemical reaction mixtures by means of ionic fluids A process for removing acids from reaction mixtures using an auxiliary base, in which the auxiliary base: combines with the acid to form a salt which is liquid at temperatures at which the product of value does not significantly decompose during the removal of the l...	04/01/2008
7345006	Catalyst system containing Ni(0) for hydrocyanation A system comprising a) Ni(0) b) from 4 to 10 mol per mol of Ni(0) in a) of a compound (I) of the formula P(X1R1)(X2R2)(X3R3) (I)	03/18/2008
7078226	Method for producing optically active amines A process for preparing optically active amines, a process for preparing racemic amines which can be resolved using optically active carboxylic acids or enzymes, and racemic and optically active amines and optically active amides are described. ...	07/18/2006
7067685	Phosphonites, use thereof as ligand in transition metal complexes and method for production of nitriles The invention relates to phosphinites I of formulae (1) or (2), in which R1, R2, R5, R6, R7, R8, R9 independently represent hydrogen, an alkyl or alkylene group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms; R3 is H or methyl; R4 is i-prop...	06/27/2006
7022866	Phosphonites Phosphonites I of the formula 1 or 2 where R1, R2 are each, independently of one another, hydrogen, an alkyl or alkylene group having from 1 to 8 carbon atoms or an alkoxy group having from 1 to 8 carbon at...	04/04/2006
6906223	Method for the production of trioxime derivatives The present invention relates to a process for preparing trioxime derivatives of the formula I in which the substituents R1 and R2 are identical or different and each is cyano, alkyl, haloalkyl or...	06/14/2005
6852199	Method for separating pentenenitrile isomers A process is provided for the distillative separation of pentene nitrile isomers which have a relative volatility alpha ranging from 1.0 to 1.3 in the pressure range from 1 to 500 kPa, wherein the distillation is carried out in the presence of a liquid diluent which...	02/08/2005
6822110	CaO-catalyzed preparation of isophoronenitrile The present invention describes a process for preparing isophoronenitrile by adding HCN to isophorone. The catalyst used is CaO which has a BET surface area of >1.5 m2/g. The use of such a catalyst achieves high yields and selectivities. ...	11/23/2004
6770770	Phosphites Novel phosphites have the formula I P(O—R1)x(O—R2)y(O—R3)z(O—R4)p I where R1: aromatic radical having a C1	08/03/2004
6554966	Process for preparing essentially formic acid-free N-alkyl-N'-methylalkyleneureas The invention relates to a process for preparing essentially formic acid-free N-alkyl-N'-methylalkyleneureas of the formula ##STR1## with R1 =H or CH3, R2 =Cn H2n+1 with n=1-4 and x=0 or 1, from the c...	04/29/2003
6521778	Catalyst comprising a complex of a metal from subgroup VIII based on a bidentate phosphonite ligand, and method for producing nitriles A catalyst which comprises at least one complex of a metal of subgroup VIII having at least one bidentate phosphonite ligand of the formula I ##STR1## or salts and mixtures thereof, a process for the preparation of mixtures of monoolefinic C5 -...	02/18/2003
6476268	Preparation of N-benzylamines N-Benzylamines are prepared by a process in which (i) in a first step, a benzaldehyde is reacted with a primary amine to give the imine and (ii) in a second step, the imine is hydrogenated with hydrogen in the presence of a catalyst containing one or more meta...	11/05/2002
6476253	Process for preparing monoacetylated hydroquinone compounds The present invention relates to a process for preparing monoacetylated hydroquinone compounds of the formula I, ##STR1## to the novel final products of the process and to a process for preparing the precursors....	11/05/2002
6440891	Catalyst comprising a complex of a metal of subgroup VIII, on the basis of a phosphonite ligand and method for hydroformylation The catalyst comprises at least one bi- or more highly dentate phosphonite ligand of the general formula I ##STR1## or salts and mixtures thereof and is useful in a process for hydroformylating compounds containing at least one ethylenically unsatura...	08/27/2002
6417353	Preparing amines Amines are prepared by reacting aldehydes or ketones at elevated temperature under elevated pressure with nitrogen compounds selected from the group of ammonia, primary and secondary amines, and with hydrogen in the presence of a catalyst containing coppe...	07/09/2002
6355833	Catalyst comprising at least one nickel(0) complex based on a phosphonite ligand, and the preparation of nitriles A catalyst comprising at least one nickel(O) complex which comprises at least one mono-, bi- or multidentate phosphonite ligand of the formula I ##STR1## or salts and mixtures thereof, is prepared as described, and the catalysts are used to prepare mixtur...	03/12/2002
6353127	଱-chloronitriles production method The invention relates to a process for the preparation of ଱-chloronitriles by reaction of cyanohydrins of aldehydes or ketones with phosgene using a phosphine oxide as catalyst....	03/05/2002
6303823	Process for preparing ketones, in particular 6-methylheptan-2-one A process for preparing ketones by so-called "crossed aldol condensation" of a ketone with an aldehyde in the presence of a catalyst system consisting of approximately equimolar amounts of a secondary amine and of a carboxylic acid containing at least 2 C...	10/16/2001
6242633	Catalyst comprising at least one phosphonite ligand based nickel (O) complex and method for the production of nitriles A catalyst comprising at least one nickel(0) complex which comprises at least one mono-, bi- or multidentate phosphonite ligand of the formula I ##STR1## or salts and mixtures thereof, is prepared as described, and the catalysts are used to prepare mixtur...	06/05/2001
6207864	Process for preparing cyclopropylacetylene The invention relates to a process for the halogenation of cyclopropylmethyl ketone with at least one dihalo-triorganophosphorane of the general formula I R3 PHal2 (I), in which the radicals R can be the same or different and denote a s...	03/27/2001
6197992	Monoolefinic C5 mononitriles, method for the production and the use thereof The disclosure is a process for preparing mixtures of monoolefinic C5 mononitriles having nonconjugated C.dbd.C-- and C.tbd.N bonding by catalytic hydrocyanation of a hydrocarbon mixture containing 1,3-butadiene, by first diminishing the propor...	03/06/2001
6180839	Continuous preparation of dimethylvinylcarbinol by isomerizing prenol A process is described for the continuous preparation of dimethylvinylcarbinol (DMVC) by continuously reacting prenol with the aqueous solution of a protic acid in the still or in the lower part of a rectification column while distilling off the DMVC form...	01/30/2001
6175019	Process for the preparation of 1,3-dimethylimidazolium 4-carboxylate 1,3-Dimethylimidazolium 4-carboxylate is prepared by reacting 1-methylimidazole with dimethyl carbonate optionally in the presence of a solvent in accordance with the following reaction scheme: ##STR1##...	01/16/2001
6169198	Method for producing mixtures of monoolefinic C5-mononitriles by catalytic hydrocyanation A process for preparing mixtures of monoolefinic C5 mononitriles with nonconjugated C.dbd.C and C.tbd.N bonds by catalytic hydrocyanation of 1,3-butadiene or a 1,3-butadiene-containing hydrocarbon mixture, wherein the hydrocyanation takes place...	01/02/2001

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Inventor: Wolfgang Siegel