Patents by Inventor Takeshi Nakai

Takeshi Nakai 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).

  • .alpha.-Fluoroalkyl carboxylic acid esters and process for preparing the same
    Patent number: 4582924
    Abstract: An .alpha.-fluoroalkyl carboxylic acid ester of the general formula ##STR1## wherein A is R.sup.1 R.sup.2 COR.sup.3 -- or R.sup.4 CO--, wherein R.sup.1 and R.sup.2 are independently hydrogen, alkyl, alkoxyl or phenyl, with or without the formation of a common ring therebetween, R.sup.3 is hydrogen or alkyl, R.sup.4 and R are independently alkyl, and R.sub.f is fluoroalkyl. The .alpha.-fluoroalkyl carboxylic acid ester is prepared by reacting a fluoroalkyl silyl ketene acetal of the formula ##STR2## wherein R' is alkyl and R.sub.f and R are the same as defined above, with the corresponding acetal, ketone or acyl halide.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: April 15, 1986
    Assignee: Daikin Kogyo Co., Ltd.
    Inventors: Nobuo Ishikawa, Takeshi Nakai
  • Alkylated or alkenylated malonic acid or its derivatives having a fluorine
    Patent number: 4578503
    Abstract: An alkylated or alkenylated malonic ester having a fluorine containing aliphatic substituent and derivatives thereof as expressed by the following general formula: ##STR1## where R.sub.f is a fluorine containing aliphatic group, R is an aliphatic group, or hydrogen or alkali metal atom, and R' is an unsubstituted or substituted aliphatic group.And a method to trap the enolate ion of a malonic ester having a fluorine containing aliphatic substituent as expressed by the following general formula,R.sub.f CH(CO.sub.2 R).sub.2where R.sub.f is a fluorine containing aliphatic group and R is an aliphatic group, hydrogen or alkali metal atom, wherein said malonic ester is converted under the action of a weaker base and/or fluoride ion to a fluorine containing enolate ion to be trapped as expressed by the following general formula:R.sub.f C.sup..crclbar. (CO.sub.2 R).sub.2where R.sub.f and R are the same as above.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: March 25, 1986
    Assignee: Daikin Kogyo Co., Ltd.
    Inventors: Nobuo Ishikawa, Takeshi Nakai, Yoshio Inouye
  • Fluoroalkyl silyl ketene acetals and a process for preparing the same
    Patent number: 4482729
    Abstract: A fluoroalkyl silyl ketene acetal of the formula ##STR1## wherein R.sub.f is a fluoroalkyl group, and R and R' are the same or different and each is an alkyl group, which is prepared by reacting or fluorinated carboxylic acid of the formulaR.sub.f CH.sub.2 COOR'wherein R.sub.f and R' are respectively the same as defined above with a silylating agent represented by a formulaR.sub.3 SiOTfwherein Tf represents a trifluoromethane sulfonyl group and R is the same as defined above.
    Type: Grant
    Filed: March 4, 1984
    Date of Patent: November 13, 1984
    Assignee: Daikin Kogyo Co., Ltd.
    Inventors: Nobuo Ishikawa, Takeshi Nakai