Patents by Inventor Wolfgang Bernhagen

Wolfgang Bernhagen 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 preparing 3-dimethylamino-2,2-dimethylpropanal
    Patent number: 4515986
    Abstract: An improved process for preparing 3-dimethylamino-2,2-dimethylpropanal from isobutyraldehyde, dimethylamine and a source of formaldehyde is disclosed wherein the process is carried out at a pH value of 9 to 11.
    Type: Grant
    Filed: August 19, 1981
    Date of Patent: May 7, 1985
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Wolfgang Bernhagen, Volker Falk, Helmut Springer, Jurgen Weber, Ernst Wiebus, Claus Kniep
  • Process for preparing 2,3-dimethyl-2,3-butanediol
    Patent number: 4404410
    Abstract: An improved process for the preparation of 2,3-dimethyl-2,3-butanediol is disclosed wherein hydrogen peroxide and 2,3-dimethylbutene are reacted with formic acid at 50.degree. to 70.degree. C. while stirring, the 2,3-dimethylbutene and hydrogen peroxide being introduced into the formic acid simultaneously but separately. The diol can be obtained by hydrolysis of the pinacol monoformate formed.
    Type: Grant
    Filed: June 10, 1981
    Date of Patent: September 13, 1983
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Boy Cornils, Jurgen Weber, Wolfgang Bernhagen, Helmut Springer
  • Process for the production of di-n-propylacetic acid
    Patent number: 4317925
    Abstract: A process for the preparation of di-n-propylacetic acid which comprises the steps ofA. converting n-valeraldehyde-diallyl acetal into allyl-1-pentenyl ether by cleaving one mol of allyl alcohol per one mol of n-valeraldehye-diallyl acetal;B. rearranging the allyl-1-pentenyl ether thermally into 2-propyl-pent-4-en-1-al,C. partially hydrogenating the 2-propyl-pent-en-1-al catalytically to form 2-propyl valeraldehyde, andD. oxidizing the 2-propyl valeraldehyde to form dipropyl-acetic acid.
    Type: Grant
    Filed: July 25, 1979
    Date of Patent: March 2, 1982
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Weber, Wolfgang Bernhagen, Helmut Springer
  • Process for preparing 2-methyl-2-sec.butyl-1,3-propanediol
    Patent number: 4317945
    Abstract: A process for the preparation of 2-methyl-2-sec.butyl-1,3-propanediol comprising hydroformylating 2-methyl-1-butene with carbon monoxide and hydrogen in the presence of a first catalyst to form the substance 3-methyl-pentanal, condensing said substance with formaldehyde, or a compound which forms formaldehyde under the conditions of condensation in a basic medium to form alpha-sec.butyl-acrolein, partially hydrogenating said acrolein in the presence of a second catalyst to form the material 2,3-dimethyl pentanal, and converting said material into said diol by treatment with formaldehyde, or a compound which forms formaldehyde under the conditions of conversion, in the presence of a strong base as a third catalyst.The compound of the present invention is useful as an intermediate in the production of pharmaceuticals and drugs; in particular, the production of carbamates which are useful as tranquilizers and blood pressure lowering agents.
    Type: Grant
    Filed: August 15, 1980
    Date of Patent: March 2, 1982
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Wolfgang Bernhagen, Jurgen Weber, Helmut Bahrmann, Helmut Springer
  • 2-Propyl-pent-4-en-1-al
    Patent number: 4307252
    Abstract: 2-Propyl-pent-4-en-1-al of the formula ##STR1## and a process for its preparation.
    Type: Grant
    Filed: July 30, 1980
    Date of Patent: December 22, 1981
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Weber, Wolfgang Bernhagen, Helmut Springer
  • Process for preparing 2,3-dimethyl-butene-2
    Patent number: 4288643
    Abstract: A process for the preparation of 2,3-dimethylbutene-2 is disclosed, which comprises the steps of converting isovaleraldehyde to isopropylacrolein, hydrogenating .alpha.-isopropylacrolein to form 2,3-dimethylbutanol, dehydrating 2,3-dimethylbutanol to form an olefin mixture comprising 2,3-dimethylbutene-1 and 2,3-dimethylbutene-2, and isomerizing the 2,3-dimethylbutene-1 contained in the mixture into 2,3-dimethylbutene-2. The present process is technically simple and inexpensive to utilize, and results in high yields of the desired product.
    Type: Grant
    Filed: May 5, 1980
    Date of Patent: September 8, 1981
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Weber, Wolfgang Bernhagen, Helmut Springer
  • Process for preparing methacrolein
    Patent number: 4283564
    Abstract: A process for preparing methacrolein by catalytic reaction of propionaldehyde with formaldehyde is disclosed wherein the catalyst comprises a mixture of secondary amine and organic carboxylic acid with up to 8 carbon atoms.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: August 11, 1981
    Assignee: Ruhrchemie AG
    Inventors: Wolfgang Bernhagen, Hanswilhelm Bach, Eike Brundin, Wilhelm Gick, Helmut Springer, Adolf Hack
  • Process for preparing 2-methylenealdehydes
    Patent number: 4275242
    Abstract: A process for preparing 2-methylenealdehydes by reacting aldehydes with formaldehyde in the presence of enamines is disclosed.
    Type: Grant
    Filed: December 21, 1979
    Date of Patent: June 23, 1981
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Weber, Wolfgang Bernhagen, Helmut Springer
  • 2-Propyl-pent-4-en-1-al
    Patent number: 4270008
    Abstract: 2-Propyl-pent-4-en-1-al of the formula ##STR1## and a process for its preparation.
    Type: Grant
    Filed: October 11, 1979
    Date of Patent: May 26, 1981
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Jurgen Weber, Wolfgang Bernhagen, Helmut Springer