Patents by Inventor Nissan Ashkenazi

Nissan Ashkenazi 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).

  • Method for the preparation of metal carbene complexes
    Patent number: 6844442
    Abstract: The present invention provides a process for preparing a metal carbene complex of formula (I): wherein M is a transition metal atom selected from the group consisting of ruthenium, rhodium, iron, cobalt, osmium and iridium; L denotes neutral donor ligands ligated to said metal, such groups being the same or different; X is an anionic ligand; R1 and R2 are each independently selected from the group consisting of hydrogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted vinyl, a is 2 or 3 and b is 1 or 2, such process comprising reacting a sulfur ylide of the formula Ar2S?CR1R2 or its precursor with an appropriate metal complex comprising a transition metal atom selected from the group consisting of ruthenium, rhodium, iron, cobalt, osmium and iridium, said metal complex being also
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: January 18, 2005
    Assignee: Yeda Research and Development Company, Ltd.
    Inventors: David Milstein, Mark Gandelman, Nissan Ashkenazi, Boris Rybtchinski
  • Method for the preparation of metal carbene complexes
    Publication number: 20040176626
    Abstract: The present invention provides a process for preparing a metal carbene complex of formula (I): wherein M is a transition metal atom selected from the group consisting of ruthenium, rhodium, iron, cobalt, osmium and iridium; L denotes neutral donor ligands ligated to said metal, such groups being the same or different; X is an anionic ligand; R1 and R2 are each independently selected from the group consisting of hydrogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted vinyl, a is 2 or 3 and b is 1 or 2, such process comprising reacting a sulfur ylide of the formula Ar2S═CR1R2 or its precursor with an appropriate metal complex comprising a transition metal atom selected from the group consisting of ruthenium, rhodium, iron, cobalt, osmium and iridium, said metal complex being
    Type: Application
    Filed: April 28, 2004
    Publication date: September 9, 2004
    Inventors: David Milstein, Mark Gandelman, Nissan Ashkenazi, Boris Rybtchinski