Patents by Inventor Albrecht Marhold

Albrecht Marhold 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).

  • Process for the preparation of 2-amino-2-arylethanols and novel intermediates
    Patent number: 5602282
    Abstract: The invention relates to a novel process for the preparation of 2-amino-2-arylethanols of the formula (I) ##STR1## in which Ar represents aryl or hetaryl each unsubstituted or identically or differently monosubstituted to pentasubstituted, where as substituents there may be mentioned:halogen, alkyl, halogenoalkyl, alkoxy, halogenoalkoxy, unsubstituted substituted cycloalkyloxy or unsubstituted or substituted phenyl,which comprises catalytically hydrogenating .alpha.-hydroxyketoximes of the formula (II) ##STR2## in which Ar has the meaning given above,using Raney nickel or Raney cobalt in the presence of a diluent and in the presence of a base andnovel 2-amino-2-arylethanols and novel .alpha.-hydroxyketoximes.
    Type: Grant
    Filed: August 4, 1995
    Date of Patent: February 11, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Lantzsch, Ernst Kysela, Albrecht Marhold
  • Process for the preparation of polyhalogenated benzotrifluorides, benzotrichlorides and benzoyl chlorides and new trihalogenobenzotrichlorides and -benzoyl chlorides
    Patent number: 5599980
    Abstract: Polyhalogenated benzotrifluorides can be reacted with chlorides from the series of Friedel-Crafts catalysts to give the corresponding benzotrichlorides, which can be hydrolysed by water in the presence of iron(III) chloride to give the corresponding benzoyl chlorides. These are suitable as intermediate products for the preparation of active compounds for medicaments and feed additives.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: February 4, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Peter Andres
  • N-cyanoaryl-nitrogen heterocycles
    Patent number: 5593945
    Abstract: The invention relates to new N-cyanoaryl-nitrogen heterocycles of the general formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 and Z have the meanings given in the description,to a plurality of processes for their preparation, to their use as herbicides and to novel intermediates.
    Type: Grant
    Filed: August 11, 1994
    Date of Patent: January 14, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Roland Andree, Mark-Wilhelm Drewes, Albrecht Marhold, Hans-Joachim Santel, Markus Dollinger
  • Process for the preparation of fluorine-substituted aminobenzodioxles and -benzodioxanes and new intermediates
    Patent number: 5559253
    Abstract: According to the invention, a new process for the preparation of fluorine-substituted aminobenzodioxoles and -benzodioxanes of the formula (I) ##STR1## in which n represents an integer 1 or 2, has been found, in which fluorine-substituted nitro-halogeno-benzodioxoles and -benzodioxanes, which are likewise new, are hydrogenated. The novel intermediates are obtained from fluorine-substituted benzodioxoles and benzodioxanes by halogenation and subsequent nitration. The amino compounds are important starting materials for highly active biocides.
    Type: Grant
    Filed: December 8, 1995
    Date of Patent: September 24, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Andres, Albrecht Marhold
  • N-aryl-substituted nitrogen-containing heterocycles intermediates and their use as herbicides and plant growth regulators
    Patent number: 5554580
    Abstract: The invention relates to novel N-aryl-substituted nitrogen-containing heterocycles, several processes and novel intermediates for their preparation, and their use as herbicides and plant growth regulators.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: September 10, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reiner Fischer, Uta Jensen-Korte, Franz Kunisch, Albrecht Marhold, Pieter Ooms, Otto Schallner, Hans-Joachim Santel, Robert R. Schmidt, Birgit Krauskopf, Harry Strang
  • Process for preparing hexafluorobutane
    Patent number: 5536890
    Abstract: 1,1,1,4,4,4-hexafluorobutane is obtained from a trifluoroethane compound, by reacting this with hydrogen in the gas phase and without a diluent on a palladium- and/or nickel-containing supported catalyst and subsequently hydrogenating the reaction product.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: July 16, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Dietmar Bielefeldt, Albrecht Marhold
  • Process for the preparation of 2,2-difluorobenzo[1,3]-dioxole-carbaldehydes and new intermediate products
    Patent number: 5525739
    Abstract: According to the invention, a new process has been found for the preparation of 2,2-difluoro-benzo[1,3]-dioxole-cabaldehydes of the formula (I) ##STR1## in which benzo[1,3]dioxole-carbaldehydes are chlorinated, the 2,2-dichloro-dichloromethylbenzo[1,3]dioxoles formed, which are likewise new, are partly fluorinated to give the 2,2-difluoro-dichloromethyl-benzo[1,3]dioxoles, which are likewise new, and these are then reacted with urotropin to give the desired compounds.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: June 11, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Peter Andres, Albrecht Marhold
  • Process for preparing hexafluorochlorobutenes
    Patent number: 5523497
    Abstract: 1,1,1,4,4,4-hexafluoro-chlorobutenes are obtained by pyrolysis of 1,1,1-trifluoro-2,2-dichloroethane. The hexafluoro-chlorobutenes obtained in this way can be converted into hexafluorobutane, a CFC substitute, by hydrogenation.
    Type: Grant
    Filed: October 25, 1994
    Date of Patent: June 4, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Lui, Albrecht Marhold, Dietmar Bielefeldt
  • Fluorinated benzotriazoles
    Patent number: 5504214
    Abstract: Substituted benzotriazoles, which contain at least 2 fluorine atoms per molecule, are excellent intermediates for preparing active compounds for pharmaceuticals and plant-protection agents; however, they themselves also exhibit a fungicidal effect.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: April 2, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Bernd Baasner, Gerd Hanssler
  • Process for the preparation of 1-fluoro-cyclopropane-1-carboxylic acid
    Patent number: 5498750
    Abstract: A new process for the preparation of 1-fluoro-cyclopropane-1-carboxylic acid of the formula ##STR1## which process comprises a) reacting in a first step, a 1-fluoro-cyclopropyl phenyl ketone of the formula ##STR2## in which R represents hydrogen, halogen, methyl, methoxy, phenyl or phenoxy, with an peroxy compound in the presence of a diluent, andb) reacting, in a second step, the resulting 1-fluoro-cyclopropane-1-carboxylate of the formula ##STR3## in which R has the abovementioned meaning, with a base in the presence of a diluent, and then acidifying the mixture. New 1-fluoro-cyclopropane-1-carboxylates of the above-mentioned formula.
    Type: Grant
    Filed: March 15, 1995
    Date of Patent: March 12, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stefan Bohm, Albrecht Marhold
  • C.sub.3 to C.sub.5 polyfluoroalkanes propellants
    Patent number: 5496867
    Abstract: Polyfluoroalkanes are used as propellants in sprayable compositions or in the the preparation of plastic foams and in the electrical industry as cleansing and degreasing agents.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: March 5, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Calus-Dieter Sommerfeld, Wilhelm Lamberts, Dietmar Bielefeldt, Albrecht Marhold, Michael Negele
  • C.sub.3 to C.sub.5 polyfluoroalkanes propellants
    Patent number: 5496866
    Abstract: Polyfluoroalkanes are used as propellants in sprayable compositions or in the the preparation of plastic foams and in the electrical industry as cleansing and degreasing agents.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: March 5, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Claus-Dieter Sommerfeld, Wilhelm Lamberts, Dietmar Bielefeldt, Albrecht Marhold, Michael Negele
  • Fluoro-trifluoromethylbenzoic acid derivatives
    Patent number: 5493048
    Abstract: The new fluoro-trifluoromethylbenzoic acid derivatives of the general formula (I) ##STR1## wherein the substituents R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 have the meaning given in the description, are suitable as starting substances for the preparation of antibacterial agents and feed additives.
    Type: Grant
    Filed: January 12, 1994
    Date of Patent: February 20, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Peter Andres
  • Process for preparing 4,5-difluorobenzaldehydes
    Patent number: 5489715
    Abstract: 4,5-Difluorobenzaldehydes of a given formula are prepared by the reaction of corresponding benzaldehydes with a fluorinating agent.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: February 6, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventor: Albrecht Marhold
  • Halogenation processes in advantageous solvents, and novel bistrifluoromethyl-polyfluoroalkoxybenzenes
    Patent number: 5484932
    Abstract: Compounds such as ##STR1## wherein R is F, CF.sub.3, CF.sub.2 H, CHF CF.sub.3 or CF.sub.2 CF.sub.3, as well as related compounds containing chlorine, are used as solvents in halogenation processes.
    Type: Grant
    Filed: June 2, 1994
    Date of Patent: January 16, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventor: Albrecht Marhold
  • O-phenylenediamines containing fluoroalkyl(ene) groups
    Patent number: 5484953
    Abstract: Novel o-phenylenediamines of the formula containing fluoroalkyl(ene) groups ##STR1## in which the symbols used have the meaning given in the description, processes for their preparation and their use as intermediates.
    Type: Grant
    Filed: June 3, 1994
    Date of Patent: January 16, 1996
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Bernd Baasner, Folker Lieb
  • Process for preparing perfluoroalkoxy (alkylthio) benzenes
    Patent number: 5463088
    Abstract: A process for preparing perfluoroalkoxy(alkylthio)benzenes from perfluorochloroalkoxy(alkylthio)-benzenes by reaction with hydrogen fluoride in the gas phase and in the presence of a catalyst.
    Type: Grant
    Filed: April 26, 1994
    Date of Patent: October 31, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Lui, Albrecht Marhold, Karl-Rudolf Gassen
  • Process for preparing hexafluorobutene
    Patent number: 5463150
    Abstract: 1,1,1,4,4,4-Hexafluorobut-2-ene is prepared from chloro-fluorobutanes of the formula (I)CF.sub.3 --CH.sub.2 --CHCl--CX.sub.3 (I)in which the individual radicals X independently of each other represent chlorine and/or fluorine, by reaction with alkali metal fluoride in an aprotic polar solvent.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: October 31, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Lui, Albrecht Marhold, Dietmar Bielefeldt
  • Process for the .alpha.-chlorination of aryl ethers
    Patent number: 5440051
    Abstract: Aryl ethers are chlorinated in the .alpha.-position by a process in which they are metered into a reaction vessel at the same time as chlorine, the reaction being carried out at temperatures in the range from 60.degree. to 150.degree. C.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: August 8, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Albrecht Marhold, Klaus Jelich
  • Process for the preparation of 1-fluoro-cyclopropane-1-carboxylic acid
    Patent number: 5434303
    Abstract: A new process for the preparation of 1-fluoro-cyclopropane-1-carboxylic acid of the formula ##STR1## which process comprises a) reacting in a first step, a 1-fluoro-cyclopropyl phenyl ketone of the formula ##STR2## in which R represents hydrogen, halogen, methyl, methoxy, phenyl or phenoxy,with an peroxy compound in the presence of a diluent, andb) reacting, in a second step, the resulting 1-fluoro-cyclopropane-1-carboxylate of the formula ##STR3## in which R has the abovementioned meaning,with a base in the presence of a diluent, and then acidifying the mixture.New 1-fluoro-cyclopropane-1-carboxylates of the above-mentioned formula.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: July 18, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stefan Bohm, Albrecht Marhold