Patents by Inventor Hiroshi Yamachika
Hiroshi Yamachika 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).
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Patent number: 5017713Abstract: Substituted aminoanthraquinone compounds, which are used for dye stuffs or intermediate thereof, represented by the formula (II) ##STR1## wherein R.sub.3 represents a C.sub.1 -C.sub.6 alkyl group which may be substituted, X represents a hydrogen atom, --COR.sub.1 or --SO.sub.2 R.sub.2 wherein R.sub.1 and R.sub.2 each represents a substituted or unsubstituted C.sub.1 -C.sub.4 alkyl or C.sub.6 -C.sub.12 aryl group, and Y and Z represent independently a hydrogen atom, a halogen atom, a nitro group or a C.sub.1 -C.sub.4 alkyl group, is prepared by allowing anthraquinone compounds represented by the formula ##STR2## wherein X, Y and Z are as defined above, to react with alkylating agents in organic solvents in the presence of organic quaternary ammonium salts and alkalies.Type: GrantFiled: November 8, 1989Date of Patent: May 21, 1991Assignees: Sumitomo Chemical Company, Ltd., Daiei Chemical Company, Ltd.Inventors: Takanori Kondo, Hiroshi Yamachika, Kunihiko Tanaka, Yasuhiro Nishida
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Patent number: 4983758Abstract: A process for producing an optically active .alpha.-isopropyl-p-chlorophenylacetic acid (ICPA) of the formula: ##STR1## wherein the symbol * stands for an asymmetric carbon atom.Type: GrantFiled: December 2, 1988Date of Patent: January 8, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshiaki Oda, Takaharu Ikeda, Hiroshi Yamachika
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Patent number: 4958033Abstract: A process for preparing an alcohol of the formula: ##STR1## by reacting a carbonyl compound of the formula: ##STR2## or an oxirane of the formula: ##STR3## magnesium and a propargyl halide of the formula: ##STR4## followed by hydrolysis, characterized in that the carbonyl compound (II) or the oxirane compound (III) and the propargyl halide (IV) are reacted simultaneously with magnesium in an inert solvent in the presence of zinc or a halide thereof.Type: GrantFiled: September 26, 1986Date of Patent: September 18, 1990Assignee: Sumitomo Chemical Company, LimitedInventors: Yukihisa Takisawa, Nobuharu Kono, Kenji Saito, Hiroshi Yamachika
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Patent number: 4510329Abstract: A process for preparing cyclopentenolones of the formula ##STR1## wherein R.sub.1 is an alkyl group having not more than 6 carbon atoms, an alkenyl or alkynyl group having not more than 6 carbon atoms or a group of the formula: ##STR2## in which R.sub.2 is a hydrogen atom, a methyl group or a halogen atom directly from the corresponding furan-carbinols of the formula: ##STR3## wherein R.sub.1 is as defined above in a single step with an excellent yield, characterized in that the furan-carbinols are treated with water in the presence or absence of a catalyst.Type: GrantFiled: November 28, 1980Date of Patent: April 9, 1985Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Hiroshi Yamachika
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Patent number: 4500721Abstract: A process for producing benzaldehydes by catalytic reduction of benzonitriles in the presence of an acid using a Raney nickel catalyst pretreated with a copper salt is disclosed.Type: GrantFiled: February 23, 1983Date of Patent: February 19, 1985Assignee: Sumitomo Chemical Company LimitedInventors: Hiroshi Yamachika, Hirotoshi Nakanishi
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Patent number: 4465862Abstract: A method of producing a 4-hydroxycyclopentenone represented by the formula, ##STR1## wherein R.sub.1 is an alkyl, alkenyl, alkynyl, cycloalkyl, thienyl, phenyl, p-methylbenzyl or benzyl group and R.sub.2 is an alkyl, alkenyl or alkynyl group having 6 or less carbon atom, which comprises reacting a furylcarbinol compound of the formula, ##STR2## wherein R.sub.1 is as defined above, in the presence of an acid in a mixed solvent of water and an organic solvent, to obtain a cyclopentenone compound of the formula, ##STR3## wherein R.sub.1 is as defined above; reacting the cyclopentenone compound in the presence of an oxidizing agent to obtain a cyclopentendione compound of the formula, ##STR4## wherein R.sub.1 is as defined above; reacting the cyclopentendione compound with a Grignard reagent of the formula,R.sub.2 MgXwherein R.sub.2 is as defined above and X is chlorine, bromine or iodine atom, to obtain an oxocyclopentene compound of the formula, ##STR5## wherein R.sub.1 and R.sub.Type: GrantFiled: September 20, 1982Date of Patent: August 14, 1984Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Hiroshi Yamachika
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Patent number: 4398043Abstract: A process for preparing cyclopentenolones of the formula: ##STR1## wherein R.sub.1 is a straight, branched or cyclic alkyl group having not more than 6 carbon atoms, a straight, branched or cyclic alkenyl group having not more than 6 carbon atoms, a straight or branched alkynyl group having not more than 6 carbon atoms or a group of the formula: ##STR2## wherein R.sub.2 is a hydrogen atom, a methyl group or a halogen atom directly from the corresponding furan-carbinols of the formula: ##STR3## wherein R.sub.1 is as defined above in a single step with an excellent yield, characterized in that the furan-carbinols are treated with water in the presence or absence of a catalyst.Type: GrantFiled: November 23, 1981Date of Patent: August 9, 1983Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Yukihisa Takisawa, Hiroshi Yamachika
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Patent number: 4371711Abstract: A method of producing a 4-hydroxycyclopentenone represented by the formula, ##STR1## wherein R.sub.1 is an alkyl, alkenyl, alkynyl, cycloalkyl, thienyl, phenyl, p-methylbenzyl or benzyl group and R.sub.2 is an alkyl, alkenyl or alkynyl group having 6 or less carbon atoms, which comprises reacting a furylcarbinol compound of the formula, ##STR2## wherein R.sub.1 is as defined above, in the presence of an acid in a mixed solvent of water and an organic solvent, to obtain a cyclopentenone compound of the formula, ##STR3## wherein R.sub.1 is as defined above; reacting the cyclopentenone compound in the presence of an oxidizing agent to obtain a cyclopentendione compound of the formula, ##STR4## wherein R.sub.1 is a defined above; reacting the cyclopentendione compound with a Grignard reagent of the formula,R.sub.2 MgXwherein R.sub.2 is as defined above and X is chlorine, bromine or iodine atom, to obtain an oxocyclopentene compound of the formula, ##STR5## wherein R.sub.1 and R.sub.Type: GrantFiled: May 20, 1980Date of Patent: February 1, 1983Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Hiroshi Yamachika
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Patent number: 4356326Abstract: A process for producing 3-oxocyclopentenes which comprises treating a furan-carbinol of the formula: ##STR1## wherein R.sub.1 is an alkyl group having not more than 6 carbon atoms, an alkenyl group having not more than 6 carbon atoms, an alkynyl group having not more than 6 carbon atoms or a group of the formula: ##STR2## in which R.sub.2 is a hydrogen atom, a methyl group or a halogen atom in an aqueous medium in the presence or absence of a catalyst at a pH of 3 to 6.5 to give the corresponding 3-oxocyclopentene of the formula: ##STR3## wherein R.sub.1 is as defined above.Type: GrantFiled: December 5, 1980Date of Patent: October 26, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Hiroshi Yamachika
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Patent number: 4352756Abstract: In the production of a furfuryl alcohol of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group and R.sub.2 is an allyl or .alpha.-methylallyl group, by combining the corresponding furfural of the formula: ##STR2## wherein R.sub.1 is as defined above, with magnesium and allyl chloride or .alpha.-methylallyl chloride into a reaction and hydrolysing the resultant product, the improved method wherein tetrahydrofuran or its mixture with at least one aromatic hydrocarbon is used as a reaction medium, and the furfural and allyl chloride or .alpha.-methylallyl chloride are simultaneously added to the reaction medium comprising magnesium, whereby the objective furfuryl alcohol is obtained in high yields.Type: GrantFiled: March 30, 1981Date of Patent: October 5, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Yukihisa Takisawa, Kenji Saito, Hiroshi Yamachika
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Patent number: 4347386Abstract: A process for preparing cyclopentenolones in good yields which comprises treating a 4-hydroxy-4-R.sub.2 -5-R.sub.1 -2-cyclopentenone of the formula: ##STR1## wherein R.sub.1 is an alkyl group having not more than 6 carbon atoms, an alkenyl group having not more than 6 carbon atoms, an alkynyl group having not more than 6 carbon atoms or a group of the formula: ##STR2## (in which R.sub.3 is hydrogen, methyl or halogen) and R.sub.2 is a hydrogen atom or a methyl group, provided that when R.sub.2 is hydrogen, R.sub.1 is neither .alpha.-methylallyl nor .alpha.-methylpropargyl, in an aqueous medium in the presence or absence of a metal salt at a temperature of 20.degree. to 200.degree. C. to give the corresponding 2-R.sub.1 -3-R.sub.2 -4-hydroxy-2-cyclopentenone of the formula: ##STR3## wherein R.sub.1 and R.sub.2 are each as defined above.Type: GrantFiled: April 22, 1981Date of Patent: August 31, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Kenji Saito, Hiroshi Yamachika
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Patent number: 4172782Abstract: An organic quaternary ammonium salt used as a catalyst in a reaction between a benzylnitrile and a halide in the presence of an alkali to obtain an .alpha.-alkyl- or .alpha.-phenyl-benzylnitrile, is recovered effectively from the reaction solution containing the .alpha.-alkyl- or .alpha.-phenyl-benzylnitrile, the alkali and the catalyst, by adding water to the reaction solution to make the alkali concentration of the water layer 10% by weight or below, and then separating the water layer containing the organic quaternary ammonium salt from the oil layer containing the .alpha.-alkyl- or .alpha.-phenyl-benzylnitrile.Type: GrantFiled: May 18, 1978Date of Patent: October 30, 1979Assignee: Sumitomo Chemical Company, LimitedInventors: Fujio Masuko, Hiroshi Yamachika, Kazuhiko Fujiyoshi, Katsuyuki Shiota
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Patent number: 4049720Abstract: A process for the continuous production of .beta.-isopropylnaphthalene hydroperoxide comprising oxidizing an isopropylnaphthalene mixture containing .alpha.- and .beta.-isopropylnaphthalene isomers with molecular oxygen or a molecular oxygen containing gas in an oxidation zone and recycling unreacted ispropylnaphthalene recoverd after the oxidation to the oxidation zone, in which the oxidation is carried out by controlling the .alpha.-isopropylnaphthalene content in the isopropylnaphthalene mixture continuously fed to the oxidation zone to about 15% by weight or less.Type: GrantFiled: February 21, 1975Date of Patent: September 20, 1977Assignee: Sumitomo Chemical Company, LimitedInventors: Hirokazu Hosaka, Kenji Tanimoto, Hiroshi Yamachika