Patents by Inventor Alexander Klausener

Alexander Klausener has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20030065211
    Abstract: According to the invention, N-butyryl-4amino-3-methyl-methyl benzoate is obtained in a particularly advantageous manner by, initially, reacting o-toluidine with butyric acid chloride, by brominating the reaction product and by reacting the bromide obtained therefrom with carbon monoxide and methanol in the presence of a palladium catalyst. The invention also relates to the important novel chemical compound N-(4-bromine-2-methylphenyl)-butanamide.
    Type: Application
    Filed: September 24, 2002
    Publication date: April 3, 2003
    Inventors: Lars Rodefeld, Thomas Hopfner, Alexander Klausener, Horst Behre
  • Patent number: 6525198
    Abstract: The invention relates to a method for the preparation of 4,6-dichloropyrimidine by reacting 4-chloro-6-methoxypyrimidine with at least one sulphur-containing chlorinating agent selected from the group consisting of SCl2, SOCl2, and SO2Cl2 in the presence of at least one phosphorus compound having the formula R3P═Yn  (1), in which R represents C1-C10-alkyl or C6-C10-aryl, each of which may optionally be substituted by up to five identical or different substituents selected from the group consisting of fluorine, chlorine, bromine, C1-C4-alkyl, and C1-C4-alkoxy, Y represents oxygen or sulphur, and n represents zero or 1.
    Type: Grant
    Filed: February 7, 2002
    Date of Patent: February 25, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Alexander Klausener, Günther Cramm, Guido Steffan
  • Publication number: 20030028024
    Abstract: The invention relates to substituted or unsubstituted benzodioxinothiophenes, their preparation and their use for preparing electrically conductive oligomers or polymers, also oligomers or polymers comprising these thiophene derivatives as repeating unit.
    Type: Application
    Filed: July 9, 2002
    Publication date: February 6, 2003
    Inventors: Gunter Rauchschwalbe, Alexander Klausener, Stephan Kirchmeyer, Knud Reuter
  • Publication number: 20030013891
    Abstract: This invention relates to the preparation of N,N′-carbonyldiazoles in a particularly advantageous manner by reacting corresponding azolide salts with phosgene in an aromatic compound or an ether as solvent. The azolide salts are preferably prepared by a novel process from an azole that is reacted with a compound of the formula M′R7 or MgR8Z′ in the presence of a solvent.
    Type: Application
    Filed: August 15, 2002
    Publication date: January 16, 2003
    Inventors: Johannes Scherer, Alexander Klausener, Robert Sollner
  • Publication number: 20030009062
    Abstract: 1
    Type: Application
    Filed: July 12, 2002
    Publication date: January 9, 2003
    Inventors: Frank Dobert, Alexander Klausener, Paul Wagner
  • Patent number: 6465678
    Abstract: Methyl carbazate which is particularly pure and has a particularly low tendency toward discoloration is obtained from hydrazine and dimethyl carbonate if the two reactants are metered simultaneously into an initially introduced first solvent at from −20 to +30° C., the solvent and low-boiling components are then distilled off under reduced pressure, and then either a second solvent is added to the crude methyl carbazate present and this solvent is distilled off under reduced pressure or an inert gas is passed through the crude methyl carbazate present.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: October 15, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lars Rodefeld, Horst Behre, Alexander Klausener, Robert Söllner
  • Patent number: 6465658
    Abstract: This invention relates to the preparation of N,N′-carbonyldiazoles in a particularly advantageous manner by reacting corresponding azolide salts with phosgene in an aromatic compound or an ether as solvent. The azolide salts are preferably prepared by a novel process from an azole that is reacted with a compound of the formula M′R7 or MgR8Z′ in the presence of a solvent.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: October 15, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Johannes Scherer, Alexander Klausener, Robert Söllner
  • Patent number: 6448455
    Abstract: The invention relates to a process for preparing trimethylolpropane with simultaneous formation of formate salts of the formula M(OOCH)n  (I), where M represents the alkali metals lithium, sodium, potassium, rubidium, caesium and/or the alkaline earth metals beryllium, calcium, strontium, barium and n is 1 when M is an alkali metal and is 2 when M is an alkaline earth metal, where n-butyraldehyde, formaldehyde and a base are reacted by the inorganic Cannizzaro process and the reaction mixture formed is subjected to vapour pressure filtration as a suspension, if appropriate after partly removing distillable constituents, such as water.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: September 10, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Paul Wagner, Alexander Klausener
  • Patent number: 6441254
    Abstract: The present invention relates to a process for preparing trimethylol compounds and formic acid by reaction of formaldehyde and aldehydes in the presence of a nitrogen base and distillation of the resulting reaction mixture in the presence of an auxiliary.
    Type: Grant
    Filed: December 13, 2001
    Date of Patent: August 27, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Frank Döbert, Paul Wagner, Alexander Klausener, Wolfgang Eymann, Rolf Feller
  • Patent number: 6441170
    Abstract: The present invention relates to a process for preparing 4,6-dichloro-pyrimidine by reaction of 4-chloro-6-methoxypyrimidine with an acid chloride in the presence of a hydrogen halide.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: August 27, 2002
    Assignee: Bayer Akitnegesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan
  • Patent number: 6441171
    Abstract: The invention relates to a method for the preparation of 4,6-dichloropyrimidine by reacting 4-chloro-6-methoxypyrimidine with phosgene as chlorinating agent in the presence of a nitrogen-containing auxiliary.
    Type: Grant
    Filed: January 24, 2002
    Date of Patent: August 27, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Franz-Josef Mais, Günther Cramm, Alexander Klausener, Guido Steffan
  • Publication number: 20020111339
    Abstract: 2-Alkyl-3-aryl- or -heteroaryloxaziridines are prepared in a particularly advantageous manner by oxidizing corresponding N-alkyl-aryl- or -heteroarylaldimines with an aromatic percarboxylic acid or a salt thereof in the presence of water, a water-soluble base, and a water-miscible solvent, at temperatures below 30° C. Using this method, it is also possible to obtain novel 2-alkyl-3-aryloxaziridines.
    Type: Application
    Filed: July 5, 2001
    Publication date: August 15, 2002
    Inventors: Alexander Klausener, Reinhard Langer, Stephan Ratsch, Michael Dockner
  • Publication number: 20020111497
    Abstract: This invention relates to the preparation of N,N′-carbonyldiazoles in a particularly advantageous manner by reacting corresponding azolide salts with phosgene in an aromatic compound or an ether as solvent. The azolide salts are preferably prepared by a novel process from an azole that is reacted with a compound of the formula M′R7 or MgR8Z′ in the presence of a solvent.
    Type: Application
    Filed: July 17, 2001
    Publication date: August 15, 2002
    Inventors: Johannes Scherer, Alexander Klausener, Robert Sollner
  • Publication number: 20020103404
    Abstract: This invention relates to a process for the nuclear chlorination of m-xylene using elemental chlorine in the presence of a Friedel-Crafts catalyst and a co-catalyst, where the co-catalysts used are benzo-fused thiazepines, or thiazocines.
    Type: Application
    Filed: August 13, 2001
    Publication date: August 1, 2002
    Inventors: Franz-Josef Mais, Alexander Klausener
  • Publication number: 20020077502
    Abstract: The present invention relates to a process for preparing trimethylol compounds and formic acid by reaction of formaldehyde and aldehydes in the presence of a nitrogen base and distillation of the resulting reaction mixture in the presence of an auxiliary.
    Type: Application
    Filed: December 13, 2001
    Publication date: June 20, 2002
    Inventors: Frank Dobert, Paul Wagner, Alexander Klausener, Wolfgang Eymann, Rolf Feller
  • Publication number: 20020066703
    Abstract: The invention relates to a process for preparing trimethylolpropane with simultaneous formation of formate salts of the formula
    Type: Application
    Filed: August 22, 2001
    Publication date: June 6, 2002
    Inventors: Paul Wagner, Alexander Klausener
  • Publication number: 20020062043
    Abstract: Optionally substituted biphenylcarbonyl chlorides are obtained in an economically and ecologically advantageous manner by reacting biphenyls with oxalyl chloride in a molar ratio of biphenyl to oxalyl chloride of from 0.7 to 1.5 in the presence of a Lewis acid.
    Type: Application
    Filed: November 7, 2001
    Publication date: May 23, 2002
    Inventors: Lars Rodefeld, Alexander Klausener, Friedrich-Wilhelm Ullrich
  • Patent number: 6392057
    Abstract: The invention relates to a process for the preparation of N,N′-carbonyldiazoles by reacting azoles with phosgene in a solvent, whereby the azole and the phosgene are metered into an aromatic solvent dried by incipient distillation in such a way that in the time in which 1 mol of azole is metered in, from 0.17 to 0.34 mol of phosgene is metered in simultaneously.
    Type: Grant
    Filed: January 17, 2001
    Date of Patent: May 21, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Johannes Scherer, Alexander Klausener, Robert Söllner
  • Publication number: 20020058703
    Abstract: Piece-form materials which comprise 5-100% by mass calcium formate and 95-0% by mass additives and have particle sizes of 0.2-5 mm can be prepared from finely crystalline calcium formate and the additives by compression and, if necessary, subsequent comminution and/or fractionation to set the particle size.
    Type: Application
    Filed: November 28, 2001
    Publication date: May 16, 2002
    Inventors: Achim Noack, Hanspeter Baumgartner, Gunter Linde, Alexander Klausener
  • Publication number: 20020049357
    Abstract: This invention relates to a process for the nucleochlorination of o-xylene using elemental chlorine in the presence of a Friedel-Crafts catalyst and a co-catalyst, where the co-catalysts used are benzo-fused thiazepines or thiazocines.
    Type: Application
    Filed: August 13, 2001
    Publication date: April 25, 2002
    Inventors: Franz-Josef Mais, Alexander Klausener, Heinrich Schrage