Patents by Inventor Ewa M. Osika

Ewa M. Osika 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).

  • Utilization of phosphorus pentasulfide in thionylations using phase transfer catalysis
    Patent number: 6960669
    Abstract: A method is disclosed for the preparation of benzo[b]thiophenecarbodithioic esters of the formula: wherein R is alkyl, R1 is hydrogen, halogen, or alkyl, R2, R3, R4, and R5 are independently selected from the group consisting of hydrogen, halogen, alkyl, alkoxy, alkylthio, trifluoromethyl, cyano, and aryl, wherein said method comprises reacting an equivalent of an S-thiol ester of the formula: with one-third of an equivalent of P2S5, 2 equivalents of at least one alkali metal carbonate, about 2.5 mole percent of a phase transfer catalyst, and a catalytic amount of water in hot toluene.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: November 1, 2005
    Assignee: Crompton Co./Cie
    Inventors: Ewa M. Osika, Walter G. Brouwer