Patents by Inventor Minkoo Ji

Minkoo Ji 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 preparing carotenoid polyene chain compounds and intermediates for preparing the same
    Patent number: 6747166
    Abstract: The present invention provides an intermediate compound used for synthesis of polyene chain structure, that is an important moiety of carotenoid compounds, a process for preparing the same, and carotenoid polyene chain compounds prepared by using the intermediate, and, in particular, a process for preparing lycopene. The process for preparing the carotenoid polyene chain compound employs an allylic sulfone compound as starting material, which is reacted with C-5 sulfide compound to extend the carbon chain. The resultant thio-sulfone compound is oxidized, and the obtained disulfone compound is combined with C-10 di(haloallylic) sulfide compound to form a chain compound containing the desired number of carbon atoms. Then, the diallylic sulfone obtained by oxidation of the diallylic sulfide is subjected to Ramberg-Baklund reaction in order to form the central triene bond. After removal of sulfonyl groups, carotenoid polyene chain compound is obtained.
    Type: Grant
    Filed: August 30, 2002
    Date of Patent: June 8, 2004
    Assignees: SK Corporation
    Inventors: Sangho Koo, Minkoo Ji
  • Process for preparing carotenoid polyene chain compounds and intermediates for preparing the same
    Publication number: 20030100785
    Abstract: The present invention provides an intermediate compound used for synthesis of polyene chain structure, that is an important moiety of carotenoid compounds, a process for preparing the same, and carotenoid polyene chain compounds prepared by using the intermediate, and, in particular, a process for preparing lycopene. The process for preparing the carotenoid polyene chain compound employs an allylic sulfone compound as starting material, which is reacted with C-5 sulfide compound to extend the carbon chain. The resultant thio-sulfone compound is oxidized, and the obtained disulfone compound is combined with C-10 di(haloallylic) sulfide compound to form a chain compound containing the desired number of carbon atoms. Then, the diallylic sulfone obtained by oxidation of the diallylic sulfide is subjected to Ramberg-Baklund reaction in order to form the central triene bond. After removal of sulfonyl groups, carotenoid polyene chain compound is obtained.
    Type: Application
    Filed: August 30, 2002
    Publication date: May 29, 2003
    Inventors: Sangho Koo, Minkoo Ji
  • Process for preparing 2,7-dimethyl-2,4,6-octatriene-1,8-dial
    Patent number: 6403838
    Abstract: A process for making 2,7-dimethyl-2,4,6-octatrien-1,8-dial starting form an allylic halide is described. The process steps include aldehyde protection, conversion to a sulfide, oxidation to an allylic sulfone followed by a Ramberg-Backlund reaction and hydrolysis.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: June 11, 2002
    Inventors: Sangho Koo, Hojin Choi, Minsoo Park, Minkoo Ji
  • Process for preparing 2,7-dimethyl-2,4,6-octatriene-1,8-dial
    Publication number: 20020026082
    Abstract: Intermediates useful in the synthesis of a compound having polyene chain structure, processes for preparing the same, and a process for preparing &bgr;-carotene utilizing the same are disclosed. Also disclosed is a novel compound, retinyl sulfide, which was synthesized by the coupling of a diallylic sulfide of the present invention with the corresponding Wittig salt.
    Type: Application
    Filed: September 27, 2001
    Publication date: February 28, 2002
    Applicant: Sangho Koo
    Inventors: Sangho Koo, Hojin Choi, Minsoo Park, Minkoo Ji
  • Diallylic sulfides and processes for preparing the same
    Patent number: 6326519
    Abstract: Diallylic sulfides represented by Formula I wherein: R1 and R2 are independently chosen from the group consisting of —CHO, —CH2Cl, —CH2Br, —CH2I, —CH2OH, CH2OSO2CF3, —CH2OSO2Ph, —CH2OSO2C6H4CH3 and —CH2OSO2CH3 and processes for making the same.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: December 4, 2001
    Inventors: Sangho Koo, Hojin Choi, Minsoo Park, Minkoo Ji
  • Process for making &bgr;-carotene
    Patent number: 6297416
    Abstract: A process for preparing &bgr;-carotene, represented by Formula 3 staring from a sulfone compound of Formula B
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: October 2, 2001
    Inventors: Sangho Koo, Hojin Choi, Minsoo Park, Minkoo Ji