Patents by Inventor Chi-Lam Tse

Chi-Lam Tse 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 OF MAKING ORGANIC COMPOUNDS
    Publication number: 20240051904
    Abstract: There is provided a method for preparing homofarnesol (1), the method comprising the steps of: a) providing farnesyl chloride (2) b) reacting farnesyl chloride (2) to homofarnesate (3) by alkoxycarbonylation; and c) reacting homofarnesate (3) to homofarnesol (1), wherein the configuration of the double bonds in the compounds 1, 2 and 3 is preserved.
    Type: Application
    Filed: December 20, 2021
    Publication date: February 15, 2024
    Inventors: Simon ELLWOOD, Chi-Lam TSE
  • Preparation of carvone
    Patent number: 6500989
    Abstract: A process for the preparation of carvone comprises hydrogenating carvoxime in the presence of a selecively poisoned catalyst. Preferred catalysts include noble metals supported on inorganic materials poisoned with a catalyst modifier. In a preferred embodiment of the process defined herein, the crude carvone reaction product produced in accordance with the process of the invention, is purified by treating the crude carvone product with an organometallic compound M(X)n wherein M is a polyvalent metal, n is the valence of M and X denotes an inorganic or organic atom or group.
    Type: Grant
    Filed: December 4, 2001
    Date of Patent: December 31, 2002
    Assignee: Quest International B.V.
    Inventors: Paul Nicholas Davey, Christopher Paul Newman, William Alexander Thiam, Chi-Lam Tse
  • Preparation of norlabdane oxide
    Patent number: 6380404
    Abstract: Norlabdane oxide, which is a well known fragrance material having ambergris-type odors, is prepared from 12-acetoxy-norlabdane oxide by a hydrogenation reaction.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: April 30, 2002
    Assignee: Quest International B.V.
    Inventors: Paul Nicholas Davey, Chi-Lam Tse
  • Preparation of norlabdane oxide
    Patent number: 5821375
    Abstract: The invention concerns a process for preparing (-)-norlabdane oxide from sclareol oxide comprising the steps of:I converting sclareol oxide to 12-acetylnorlabdane oxide by oxidation with an organic hydroperoxide;II converting 12-acetylnorlabdane oxide to 12-acetoxy-norlabdane oxide by oxidation with an organic peracid.Step I is preferably performed with tert-butyl hydroperoxide and step II with peracetic acid.Sclareol oxide may be prepared from sclareol by ozonolysis followed by treatment with alkaline hydrogen peroxide. 12-Acetoxy-norlabdane oxide is preferably converted to norlabdane oxide by reduction with NaBH.sub.4 in the presence of a transition metal salt.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: October 13, 1998
    Assignee: Quest International B.V.
    Inventors: Paul Nicholas Davey, Laurence Sidney Payne, Chi-lam Tse
  • Production of (-)dodecahydro-3a,6,6,9a-tetramethyl-naphtho[2,1-b] furan
    Patent number: 5473085
    Abstract: Preparation of a methyl ketone intermediate useful in the synthesis of (-)-dodecahydro-3a,6,6, 9a-tetramethyl-naphtho(2,1-b) furan by subjecting (-)-sclareol to ozonolysis in the presence of iodine or iodine-containing compound. The intermediate can be converted to (-)-dodecahydro-3a,6,6,9a-tetramethyl-naphtho(2,1-b) furan by Baeyer-Villiger oxidation followed by reduction of the resulting product in the presence of a Lewis acid.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: December 5, 1995
    Assignee: Quest International B.V.
    Inventors: Derek H. R. Barton, Dennis K. Taylor, Chi-Lam Tse
  • Preparation of ambrox
    Patent number: 5463089
    Abstract: Synthesis of (-)-dodecahydro-3a,6,6,9a-tetramethyl-naphtho(2,1-b)furan from sclareol in a three-stage process.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: October 31, 1995
    Assignee: Quest International B.V.
    Inventors: Derek H. R. Barton, Shyamal I. Parekh, Dennis K. Taylor, Chi-lam Tse