Patents by Inventor Lodewijk Van der Wolf

Lodewijk Van der Wolf 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).

  • 1,2-bis-(4,7-dimethyl-1,4,7-triazacyclonon-1-yl)-ethane and intermediate for the synthesis of same
    Patent number: 8907082
    Abstract: The present invention provides improved processes for the synthesis of 1,4-ditosyl-1,4,7-triazacyclonone, comprising deprotecting a compound of formula (C): wherein P is tosylate or arylsulfonate, with an acidic medium to form 1,2-bis(1,4,7-triazacyclonon-1-yl)-ethane; and subsequently adding formaldehyde and formic acid to the acidic medium to form 1,2-bis-(4,7-dimethyl-1,4,7-triazacyclonon-1-yl)-ethane (Me4-DTNE). The syntheses of intermediates are also disclosed.
    Type: Grant
    Filed: July 5, 2011
    Date of Patent: December 9, 2014
    Assignee: Catexel Limited
    Inventors: Ronald Hage, Jean Hypolites Koek, Stephen William Russell, Lodewijk Van der Wolf, Jianrong Zhang, Wei Zhao, Xiaohong Wang
  • 1,2-BIS-(4,7-DIMETHYL-1,4,7-TRIAZACYCLONON-1-YL)-ETHANE AND INTERMEDIATE FOR THE SYNTHESIS OF SAME
    Publication number: 20130261297
    Abstract: The present invention provides improved processes for the synthesis of 1,4-ditosyl-1,4,7-triazacyclonone and protected analogues thereof, and to synthesise bis(triazacyclononane) ligands.
    Type: Application
    Filed: July 5, 2011
    Publication date: October 3, 2013
    Applicant: CATEXEL LIMITED
    Inventors: Ronald Hage, Jean Hypolites Koek, Stephen William Russell, Lodewijk Van der Wolf, Jianrong Zhang, Wei Zhao, Xiaohong Wang
  • Process for preparing manganese complexes
    Patent number: 5274147
    Abstract: A process for preparing a dinuclear manganese complex of formula (A) ##STR1## wherein: Mn represents manganese in the III or IV oxidation state, each X is independently a co-ordinating or bridging species selected from H.sub.2 O, O.sub.2.sup.-, O.sup.2-, OH.sup.-, SH.sup.-, S.sup.2-,>S=O, Cl.sup.-, N.sub.3.sup.-, SCN.sup.-, N.sup.3-, RCOO.sup.-, NH.sub.2.sup.- and NR.sub.
    Type: Grant
    Filed: July 6, 1992
    Date of Patent: December 28, 1993
    Assignee: Lever Brothers Company, Division of Conopco, Inc.
    Inventors: Judith Kerschner, Jean H. Koek, Ronald P. Potman, Lodewijk Van der Wolf