Patents by Inventor T. L. Ho

T. L. Ho 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 making alkyl cyclopentenones
    Patent number: 4329508
    Abstract: A process for making mixed 2- and 3-C.sub.1 -C.sub.10 alkyl-2-cyclopenten-1-ones from a corresponding alkylcyclopentadiene by epoxidation to the oxiranes, hydrolysis to the diols, dehydration of the diols and rearrangement of the resulting mixed alkylcyclopentenones. The resulting product can be used to make methylcyclopentenolone, a synthetic maple flavor.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: May 11, 1982
    Assignee: SCM Corporation
    Inventors: T. L. Ho, Shing-Hou Liu
  • Process for producing lactones from unsaturated carbonyl compounds
    Patent number: 4309352
    Abstract: A method for producing an alkyl substituted lactone including the steps of alkylating an unsaturated ketone with a C.sub.1 -C.sub.12 alkyl organometallic reagent such as a Grignard reagent or an alkali metal alkyl, to form an unsaturated alcohol, and oxidatively cleaving the unsaturated alcohol to form the lactone, and recovering the lactone.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: January 5, 1982
    Assignee: SCM Corporation
    Inventor: T. L. Ho
  • Producing substituted 2-cyclopentenones
    Patent number: 4304942
    Abstract: A process is provided for producing substituted 2-cyclopentenones represented by the general formula: ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.5 are hydrogen or lower aliphatic hydrocarbyl groups. The process comprises treating a nitroalkane with a substituted acrylic acid ester in the presence of a base, followed by saponification, to yield a substituted 4-nitropentanoic acid which acid is then treated with strong acid under dehydrative conditions to yield the subject 2-cyclopentenone.
    Type: Grant
    Filed: May 21, 1980
    Date of Patent: December 8, 1981
    Assignee: SCM Corporation
    Inventor: T. L. Ho
  • Synthesis of (+)-cis-homocaronic acid
    Patent number: 4296251
    Abstract: A process for producing (+)-cis-homocaronic acid from 2-caren-4-ol, 2-caren-4-one, 3-caren-2-ol, or mixtures thereof is disclosed. The reactants are ozonized, the ozonides produced are treated with an oxidizing agent, and the (+)-cis-homocaronic acid is recovered. The oxidizing agent can be hydrogen peroxide in either a basic or an acid medium.
    Type: Grant
    Filed: May 15, 1980
    Date of Patent: October 20, 1981
    Assignee: SCM Corporation
    Inventors: T. L. Ho, Zia U. Din, Carlos G. Cardenas
  • Preparation of (-)-dihydrochrysanthemolactone
    Patent number: 4296038
    Abstract: A four-step process for producing (-)-dihydrochrysanthemolactone from 2-caren-4-one is disclosed. The four steps in order are methylating 2-caren-4-one, oxidizing, methylating the tautomeric mixture resulting from the oxidation, and finally lactonizing the single hydroxy acid resulting from the second methylation. Additionally, three novel intermediate compounds that are produced by the steps in the process are disclosed.
    Type: Grant
    Filed: April 24, 1980
    Date of Patent: October 20, 1981
    Assignee: SCM Corporation
    Inventors: T. L. Ho, Zia U. Din
  • Synthesis of menthofuran
    Patent number: 4240969
    Abstract: A new process for synthesizing menthofuran is disclosed. Said process comprises epoxidizing isopulegol to form the new compound isopulegol epoxide. The epoxide is then oxidized to form isopulegone epoxide which can be cyclodehydrated to form menthofuran.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: December 23, 1980
    Assignee: SCM Corporation
    Inventors: T. L. Ho, Zia U. Din, Sean G. Traynor