Patents by Inventor Gerhard Erker

Gerhard Erker 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 substituted indenes
    Patent number: 5194619
    Abstract: The compounds of the formula I or Ia ##STR1## in which R.sup.1 is alkyl, aryl, alkoxy, alkenyl, arylalkyl, alkylaryl, aryloxy, fluoroalkyl, halogenoaryl, alkynyl, trialkylsilyl or a heteroaromatic radical,R.sup.2, R.sup.3 and R.sup.4, in addition to hydrogen, have the meanings given under R.sup.1 andR.sup.5 is hydrogen, alkyl, fluoroalkyl or alkenyl, can be obtained in a one-stage process by reaction of a compound II ##STR2## with (substituted) cyclopentadiene in the presence of a base. The compounds I and Ia are suitable as ligands for metallocene complexes which are used as catalysts in olefin polymerization.
    Type: Grant
    Filed: February 14, 1992
    Date of Patent: March 16, 1993
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dieter Reuschling, Jurgen Rohrmann, Gerhard Erker, Reiner Nolte, Michael Aulbach, Astrid Weiss