Patents by Inventor Taku Shimura

Taku Shimura 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 producing dichloromethylpyridines
    Patent number: 5290944
    Abstract: A method for producing a dichloromethylpyridine of the formula (II): ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which are independent of one another, is a hydrogen atom, a halogen atom, an alkoxy group or a phenoxy group which may be substituted, provided that R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not simultaneously hydrogen atoms, which comprises reacting a trichloromethylpyridine of the formula (I): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined above, with a reducing agent, wherein:(1) a dialkyl phosphite or a trialkyl phosphite is used as the reducing agent, and the reaction is conducted in the presence of a basic substance and an alcohol solvent, or(2) a trialkyl phosphine or triphenyl phosphine is used as the reducing agent, and the reaction is conducted in the presence of an alcohol solvent.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: March 1, 1994
    Assignee: Ishihara Sangyo Kaisha Ltd.
    Inventors: Rikuo Nasu, Taku Shimura, Isamu Katsuyama