Patents by Inventor Hidenori Kumobayashi

Hidenori Kumobayashi 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).

  • Ruthenium-phosphine complex
    Patent number: 4764629
    Abstract: A ruthenium-phosphine complex represented by formula (I): ##STR1## wherein R represents a hydrogen atom, a methyl group, or a methoxy group; S represents a tertiary amine; when y is 0, then x is 2, z is 4, and p is 1; and when y is 1, then x is 1, z is 1, and p is 0. The complex is inexpensive and exhibits excellent performance as a catalyst for various organic syntheses, and particularly asymmetric hydrogenation.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: August 16, 1988
    Assignee: Takasago International Corporation
    Inventors: Noboru Sayo, Takanao Taketomi, Hidenori Kumobayashi, Susumu Akutagawa
  • Ruthenium-phosphine complex
    Patent number: 4739085
    Abstract: A ruthenium-phosphine complex represented by formula (I):[RuH.sub.l (R-BINAP).sub.m ]X.sub.n' (I)wherein R-BINAP is a tertiary phosphine represented by formula (II): ##STR1## R is a hydrogen atom or a methyl group; X is a ClO.sub.4, BF.sub.4, or PF.sub.6 ; and when l is 0, then m is 1 and n' is 2, and when l is 1, then m is 2 and n' is 1, is disclosed. The complex is inexpensive and exhibits excellent performances as a catalyst for various organic syntheses, and particularly for asymmetric hydrogenation.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: April 19, 1988
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Hidemasa Takaya, Tetsuo Ohta, Ryoli Noyori, Noboru Sayo, Hidenori Kumobayashi, Susumu Akutagawa
  • Ruthenium-phosphine complex
    Patent number: 4739084
    Abstract: A ruthenium-phosphine complex having a 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl or its derivative as a ligand and carboxyl groups bonded to the ruthenium atom thereof is disclosed. The complex is inexpensive and exhibits excellent performances as a catalyst for various organic syntheses, and particularly for asymmetric hydrogenation.
    Type: Grant
    Filed: April 15, 1987
    Date of Patent: April 19, 1988
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Hidemasa Takaya, Tetsuo Ohta, Ryoji Noyori, Nobuo Yamada, Toshiyuki Takezawa, Noboru Sayo, Takanao Taketomi, Hidenori Kumobayashi, Susumu Akutagawa
  • 5,5'-diamino or 5,5'-diacetamido-2,2'-bis(diphenylphosphino)-1,1'-binaphthyls
    Patent number: 4705895
    Abstract: A phosphine compound represented by formula: ##STR1## wherein R represents a hydrogen atom or an acetyl group; and Ph represents a phenyl group. The phosphine compound is capable of forming a complex with a metallic element, e.g., rhodium, ruthenium, palladium, etc., which exhibits high performances as a catalyst for asymmetric syntheses.
    Type: Grant
    Filed: November 21, 1986
    Date of Patent: November 10, 1987
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Tamon Okano, Hidenori Kumobayashi, Susumu Akutagawa, Jitsuo Kiji, Hisatoshi Konishi, Keiichi Fukuyama, Yasunobu Shimano
  • Process for the preparation of enamines or imines
    Patent number: 4695631
    Abstract: A process for the preparation of enamines or imines by isomerization of allylamine derivatives is described. Allylamine derivatives represented by formula (I): ##STR1## are isomerized using as a catalyst a rhodium complex represented by formula (IV):[Rh(olefin)L].sup.+ X.sup.- (IV)to form enamines or imines represented by, respectively, formula (II) or formula (III): ##STR2## All of the symbols in the above formulae are as described. These enamines or imines are useful intermediates for the preparation of a number of organic compounds.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: September 22, 1987
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Seinosuke Otsuka, Kazuhide Tani, Tsuneaki Yamagata, Susumu Akutagawa, Hidenori Kumobayashi, Misao Yagi
  • Rhodium-phosphine complex
    Patent number: 4605750
    Abstract: A novel rhodium-phosphine complex represented by the formula (I):[Rh(BINAP).sub.2 ].sup.+ Y.sup.-wherein BINAP represents 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl, and Y represents ClO.sub.4, PF.sub.6, BF.sub.4, PCl.sub.6 or B(C.sub.6 H.sub.4) is described. This complex can be used as a catalyst for various organic syntheses and also for asymmetric syntheses such as an asymmetric isomerization reaction and an asymmetric hydrogenation reaction. Due to its high activity, the complex is very useful as a catalyst.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: August 12, 1986
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Hidenori Kumobayashi, Susumu Akutagawa
  • Rhodium-phosphine complex
    Patent number: 4604474
    Abstract: A novel rhodium-phosphine complex represented by the formula[Rh(p-Tolyl BINAP).sub.2 ].sup.+ Y.sup.-wherein p-Tolyl BINAP represents 2,2'-bis(di-p-tolylphosphino)-1,1'-binaphthyl, and Y represents ClO.sub.4, PF.sub.6, BF.sub.4 or PCl.sub.6 is described. This complex can be used as a catalyst for various organic syntheses and also for asymmetric syntheses such as an asymmetric isomerization reaction and an asymmetric hydrogenation reaction. Due to its high activity, the complex is very useful as a catalyst.
    Type: Grant
    Filed: March 21, 1985
    Date of Patent: August 5, 1986
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Hidenori Kumobayashi, Susumu Akutagawa
  • Process for producing myrcenol
    Patent number: 4520212
    Abstract: Myrcenol is produced in an effecient, high yield and economical process by deaminating 7-hydroxygeranyl dialkylamine or 7-hydroxyneryl dialkylamine with a specific palladium-phosphine-cation complex catalyst represented by the formula[<.cndot.:PdL].sup.+ X.sup.-wherein <.cndot.: represents .eta.-allyl, L represents a tertiary phosphine, and X represents a counter anion.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: May 28, 1985
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Shigeru Mitsuhashi, Hidenori Kumobayashi, Susumu Akutagawa
  • Process for preparing derivatives of conjugated diene dimers
    Patent number: 4144257
    Abstract: A process for preparing derivatives of isoprene dimers, which are useful as materials for producing perfumes, pharmaceuticals and industrial chemicals, comprising catalytically reacting isoprene with an active methyl-containing compound, such as methacrylonitrile, using bis-.pi.-allyl nickel or bis-cyclooctadiene nickel as a catalyst and triphenyl phosphine, triphenyl phosphite, tributyl arsenic or tricyclohexyl phosphine as a ligand and a tertiaryamine compound as a solvent.
    Type: Grant
    Filed: July 30, 1976
    Date of Patent: March 13, 1979
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Hidenori Kumobayashi, Susumu Akutagawa, Akira Komatsu