Patents by Inventor Takerou Ishizaki

Takerou Ishizaki 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).

  • Water-soluble alkali metal sulfonate-substituted binaphthylphosphine transition metal complex and enantioselective hydrogenation method using it
    Patent number: 5324861
    Abstract: An alkali metal sulfonate-substituted binaphthyl-phosphine transition metal complex is disclosed, which is represented by formula (I)[M(X).sub.n (Q)(SO.sub.3 A--BINAP)]Y (I)wherein M represents a transition metal atom; SO.sub.3 A--BINAP represents a tertiary phosphine represented by formula (II) ##STR1## in which A represents an alkali metal atom; X represents a chlorine atom, a bromine atom, or an iodine atom;when n is 1, M represents ruthenium, Q represents benzene or p-cymene, and Y represents a chlorine atom, a bromine atom, or an iodine atom;when n is 0 and M is iridium or rhodium, Q represents 1,5-cyclo-octadiene or norbornadiene, and Y represents ClO.sub.4, PF.sub.6 or BF.sub.4 ; and when n is 0 and M is palladium, Q represents .pi.-allyl, and Y represents ClO.sub.4, PF.sub.6, or BF.sub.4.
    Type: Grant
    Filed: September 7, 1993
    Date of Patent: June 28, 1994
    Assignee: Takasago International Corporation
    Inventors: Takerou Ishizaki, Hidenori Kumobayashi
  • Water-soluble alkali metal sulfonate-substituted binaphthylphosphine transition metal complex and enantioselective hydrogenation method using it
    Patent number: 5274146
    Abstract: An alkali metal sulfonate-substituted binaphthyl-phosphine transition metal complex is disclosed, which is represented by formula (I)[M(X).sub.n (Q)(SO.sub.3 A-BINAP)]Y (I)whereinM represents a transition metal atom;SO.sub.3 A-BINAP represents a tertiary phosphine represented by formula (II) ##STR1## in which A represents an alkali metal atom; X represents a chlorine atom, a bromine atom, or an iodine atom;when n is 1, M represents ruthenium, Q represents benzene or p-cymene, and Y represents a chlorine atom, a bromine atom, or an iodine atom;when n is 0 and M is iridium or rhodium, Q represents 1,5-cyclo-octadiene or norbornadiene, and Y represents ClO.sub.4, PF.sub.6 or BF.sub.4 ; andwhen n is 0 and M is palladium, Q represents .pi.-allyl, and Y represents ClO.sub.4, PF.sub.6, or BF.sub.4.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: December 28, 1993
    Assignee: Takasago International Corporation
    Inventors: Takerou Ishizaki, Hidenori Kumobayashi
  • 2,2'-bis(di-(3,5-dialkylphenyl)phosphino)-1,1'-binaphthyl and transition metal complex containing the samd ligand
    Patent number: 5223632
    Abstract: A 2,2'-bis[di-(3,5-dialkylphenyl)phosphino]-1,1'-binaphthyl represented by formula (I): ##STR1## wherein R represents a lower alkyl group, is disclosed. A transition metal complex comprising a transition metal and a 2,2'-bis[di(3,5-dialkylphenyl)phosphino]-1,1'-binaphthyl represented by formula (I) as a ligand is also disclosed.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: June 29, 1993
    Assignee: Takasago International Corporation
    Inventors: Takerou Ishizaki, Yoji Hori, Hidenori Kumobayashi