Patents by Inventor Angelika Preetz

Angelika Preetz 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 producing isopropylidene bis(cyclopentadienyl)zirconium dichloride
    Patent number: 11566037
    Abstract: The present invention describes a process for preparing isopropylidene bis(cyclopentadienyl)zirconium dichloride comprising the steps of: (a) reacting acetone and cyclopentadiene in the presence of sodium methoxide or sodium ethoxide so as to form 2,2-dicyclopentadienylpropane; and (b) reacting said 2,2-dicyclopentadienylpropane with zirconium(IV) chloride in the presence of n-butyl lithium so as to form isopropylidene bis(cyclopentadienyl) zirconium dichloride.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: January 31, 2023
    Assignee: LANXESS Organometallics GmbH
    Inventors: Angelika Preetz, Silvia Maus
  • PROCESS FOR PRODUCING ISOPROPYLIDENE BIS(CYCLOPENTADIENYL)ZIRCONIUM DICHLORIDE
    Publication number: 20200071348
    Abstract: The present invention describes a process for preparing isopropylidene bis(cyclopentadienyl)zirconium dichloride comprising the steps of: (a) reacting acetone and cyclopentadiene in the presence of sodium methoxide or sodium ethoxide so as to form 2,2-dicyclopentadienylpropane; and (b) reacting said 2,2-dicyclopentadienylpropane with zirconium(IV) chloride in the presence of n-butyl lithium so as to form isopropylidene bis(cyclopentadienyl) zirconium dichloride.
    Type: Application
    Filed: March 16, 2018
    Publication date: March 5, 2020
    Applicant: LANXESS Organometallics GmbH
    Inventors: Angelika Preetz, Silvia Maus
  • Preparation of tri-alkyl gallium or tri-alkyl indium compounds
    Patent number: 8513447
    Abstract: Trialkyl metal compounds, such as trialkyl gallium and indium compounds, are prepared in high yield and high purity by the addition of a trialkyl aluminum compound to a mixture prepared by adding a metal trihalide, e.g., GaCl3 or InCl3, and a halide salt of a monovalent metal to an ionic liquid such as a molten salt of the formula M[AlRnX(4-n)] wherein M is a monovalent metal such as Li, Na, K or Cs, R is an alkyl group X is a halide and n is a number from 1 to 3, typically at temperatures of from 75 to 160° C.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: August 20, 2013
    Assignee: Chemtura Corporation
    Inventors: Nicola Maggiarosa, Angelika Preetz, David J. Sikora
  • Preparation of Tri-Alkyl Gallium or Tri-Alkyl Indium Compounds
    Publication number: 20130197252
    Abstract: Trialkyl metal compounds, such as trialkyl gallium and indium compounds, are prepared in high yield and high purity by the addition of a trialkyl aluminum compound to a mixture prepared by adding a metal trihalide, e.g., GaCl3 or InCl3, and a halide salt of a monovalent metal to an ionic liquid such as a molten salt of the formula M[AlRn X(4-n)] wherein M is a monovalent metal such as Li, Na, K or Cs, R is an alkyl group X is a halide and n is a number from 1 to 3, typically at temperatures of from 75 to 160° C.
    Type: Application
    Filed: January 18, 2013
    Publication date: August 1, 2013
    Applicant: Chemtura Corporation
    Inventors: Nicola Maggiarosa, Angelika Preetz, David J. Sikora
  • RHODIUM-PHOSPHORUS COMPLEXES AND THEIR USE IN RING OPENING REACTIONS
    Publication number: 20110004005
    Abstract: The present invention is directed to novel rhodium-phosphorus complexes of formula: [Rh(PP?)(solv)2]X the process for their preparation and their use as catalysts in the ring opening reaction of heteronorbornenes and other ?,?-unsaturated compounds.
    Type: Application
    Filed: December 3, 2008
    Publication date: January 6, 2011
    Applicant: Laboratorios Del Dr. Esteve, S.A.
    Inventors: Detfleff Heller, Hans-Joachim Drexler, Angelika Preetz, Antoni Torrens Jover, Helmut Heinrich Buschmann