Patents by Inventor Gohu Suzukamo
Gohu Suzukamo 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: 5004843Abstract: Process for preparing predominantly Z-substituted allylic alcohols of the formula: ##STR1## wherein R.sup.1 is a straight or branched C.sub.1 -C.sub.25 alkyl group optionally bearing at least one substituent and/or at least one unsaturated linkage and R.sup.2 is a hydrogen atom or a methyl group, which comprises reacting a vinyl epoxide of the formula: ##STR2## wherein R.sup.2 is as defined above with an organolithium compound of the formula above. More particularly, there is disclosed a process for R.sup.1 --Li wherein R.sup.1 is as defined above; particularly, process for preparing .alpha.-santalol of the formula: ##STR3## which comprises reacting 3-methyl-3,4-epoxybutene-1 with lithiomethyl-2,3-dimethyltricyclo[2.2.1.0.sup.2,6 ]heptane.Type: GrantFiled: May 29, 1990Date of Patent: April 2, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Mitsuhisa Tamura, Gohu Suzukamo, Ken-ichi Hirose
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Patent number: 4403096Abstract: A novel optically active cis-4,5-disubstituted imidazolidin-2-one derivative of the formula: ##STR1## wherein R.sup.1 is a C.sub.1 -C.sub.4 alkyl group or benzyl and R.sup.2 is a chiral aralkyl group optionally having at least one of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy and hydroxyl groups is produced asymmetrically by the reaction of 1,3-dibenzyl-cis-4,5-dicarboxy-imidazolidin-2-one or its anhydride with an optically active secondary amine of the formula: ##STR2## wherein R.sup.1 and R.sup.2 are each as defined above and is transformed into the lactone of 1,3-dibenzyl-cis-4-carboxy-5-hydroxymethyl-imidazolidin-2-one, which is a key intermediate in the synthesis of d-biotin.Type: GrantFiled: June 29, 1981Date of Patent: September 6, 1983Assignee: Sumitomo Chemical Company, LimitedInventors: Motoo Hazama, Tadatoshi Aratani, Gohu Suzukamo, Takeo Takahashi
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Patent number: 4340544Abstract: Rose oxide, which is an important olfactive compound valuable in the art of perfumery, is advantageously produced from citronellol through a novel synthetic route comprising(1) anodic alkoxylation of citronellol using as a supporting electrolyte an alkali metal aromatic sulfonate,(2) dealkoxylation of the resulting 2,6-dimethyl-3-alkoxyoct-1-en-8-ol in the presence of a palladium or nickel complex, and then(3) cyclization of the resulting dehydrocitronellol in the presence of an acid.Type: GrantFiled: July 31, 1981Date of Patent: July 20, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Gohu Suzukamo, Tetsuo Takano, Mitsuhisa Tamura, Kiyoshi Ikimi
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Patent number: 4338467Abstract: A process for preparing an arylacetaldehyde by reacting the corresponding arylmethyl halide with carbon monoxide and hydrogen in the presence of a cobalt compound and a basic reagent in a liquid medium, characterized in that the basic reagent is an alkali metal compound and the liquid medium is a solvent system chosen from nitriles and their mixtures with hydrocarbons, whereby the arylacetaldehyde can be produced in a good yield by the use of a small amount of the cobalt compound as the catalyst.Type: GrantFiled: February 10, 1981Date of Patent: July 6, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Tetsuo Takano, Gohu Suzukamo, Masaru Ishino, Kiyoshi Ikimi
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Patent number: 4317918Abstract: An alcohol is produced in a high selectivity with a good yield from the corresponding carboxylic acid by reducing the latter with hydrogen in the presence of a rhenium catalyst in the coexistence of an organic base. An arylacetic acid, which is included in the starting carboxylic acid, can be produced in an excellent yield from the corresponding aryl aldehyde by reacting the latter with carbon monoxide and water in the presence of rhodium or its compound and hydrogen iodide.Type: GrantFiled: November 3, 1980Date of Patent: March 2, 1982Assignee: Sumitomo Chemical Co., Ltd.Inventors: Tetsuo Takano, Gohu Suzukamo, Masaru Ishino, Kiyoshi Ikimi
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Patent number: 4312717Abstract: Rose oxide, which is an important olfactive compound valuable in the art of perfumery, is advantageously produced from citronellol through a novel synthetic route comprising(1) anodic alkoxylation of citronellol using as a supporting electrolyte an alkali metal aromatic sulfonate,(2) dealkoxylation of the resulting 2,6-dimethyl-3-alkoxyoct-1-en-8-ol in the presence of a palladium or nickel complex, and then(3) cyclization of the resulting dehydrocitronellol in the presence of an acid.Type: GrantFiled: June 12, 1980Date of Patent: January 26, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Gohu Suzukamo, Tetsuo Takano, Mitsuhisa Tamura, Kiyoshi Ikimi
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Patent number: 4246424Abstract: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##STR1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with a catalyst comprising an alkali metal and a polycyclic aromatic hydrocarbon until a sufficient amount of the optically active amine is racemized.Type: GrantFiled: May 14, 1976Date of Patent: January 20, 1981Assignee: Sumitomo Chemical Company, LimitedInventors: Tsuneyuki Nagase, Gohu Suzukamo, Yoshio Suzuki
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Patent number: 4182906Abstract: A method for racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom or an alkyl group having 1 to 4 carbon atoms or, when taken together with the carbon atom to which they are attached, represent a cycloalkylidene group having 4 to 6 carbon atoms, which comprises the step of contacting the corresponding acid halide with boron halide at a temperature of not more than 20.degree. C.Type: GrantFiled: May 19, 1977Date of Patent: January 8, 1980Assignee: Sumitomo Chemical Company, LimitedInventors: Gohu Suzukamo, Tsuneyuki Nagase
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Patent number: 4169207Abstract: An optically active lysine alkyl ester.dihydrochloride is racemized by heating at 100.degree. C. to 250.degree. C. under an atmosphere of hydrogen. By combining this process with asymmetric hydrolysis of racemic lysine alkyl ester with enzymes, racemic lysine alkyl ester can be converted all to L-lysine.Type: GrantFiled: June 19, 1978Date of Patent: September 25, 1979Assignee: Sumitomo Chemical Company, LimitedInventors: Motoo Hazama, Gohu Suzukamo
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Patent number: 4158016Abstract: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##STR1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with a catalyst comprising an alkali metal and a polycyclic aromatic hydrocarbon until a sufficient amount of the optically active amine is racemized.Type: GrantFiled: December 16, 1977Date of Patent: June 12, 1979Assignee: Sumitomo Chemical Company, LimitedInventors: Tsuneyuki Nagase, Gohu Suzukamo, Yoshio Suzuki
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Patent number: 4154744Abstract: A process for producing furan derivatives of the formula, ##STR1## wherein R is hydrogen, methyl or chloromethyl, which comprises reacting a mono- or a disaccharide with hydrochloric acid in a mixture containing water, an organic solvent and a catalytic amount of a surface active agent.Type: GrantFiled: October 7, 1977Date of Patent: May 15, 1979Assignee: Sumitomo Chemical Company, LimitedInventors: Kazuhiko Hamada, Gohu Suzukamo, Tsuneyuki Nagase
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Patent number: 3989750Abstract: A method for racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids of the formula: ##EQU1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom or an alkyl group having 1 to 4 carbon atoms or, when taken together with the carbon atom to which they are attached, represent a cycloalkylidene group having 4 to 6 carbon atoms, which comprises the step of contacting the corresponding acid halide with a Lewis acid.Type: GrantFiled: November 8, 1974Date of Patent: November 2, 1976Assignee: Sumitomo Chemical Company, LimitedInventors: Tsuneyuki Nagase, Gohu Suzukamo
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Patent number: 3970700Abstract: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##EQU1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with an alkali metal catalyst selected from the group consisting of (1) an alkali metal deposited on a solid carrier, (2) an alkali metal dispersed in a liquid medium and (3) an alkali metal alloy at a temperature of from -10.degree. to 50.degree.C until a sufficient amount of the optically active amine is recemized.Type: GrantFiled: September 6, 1974Date of Patent: July 20, 1976Assignee: Sumitomo Chemical Company, LimitedInventors: Tsuneyuki Nagase, Gohu Suzukamo, Yoshio Suzuki
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Patent number: 3943167Abstract: A process for preparing trans-chrysanthemic acid which comprises reacting a mixture of alkyl trans-chrysanthemate and alkyl cis-chrysanthemate with an equimolar amount or less of an alkali with respect to the trans-isomer in the presence of water or an alcohol to hydrolyze the trans-isomer predominantly and separating the hydrolyzed trans-isomer from the unreacted cis-isomer.Type: GrantFiled: November 13, 1973Date of Patent: March 9, 1976Assignee: Sumitomo Chemical Company, LimitedInventors: Gohu Suzukamo, Masami Fukao, Tsuneyuki Nagase, Horosuke Toshioka
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Patent number: 3931280Abstract: Alkyl cis-chrysanthemate is treated with a catalytic amount of alkali metal alkoxide at a temperature of about 50.degree. to 200.degree.C in the absence or presence of an aprotic solvent to give alkyl trans-chrysanthemate in a high purity and an excellent yield.Type: GrantFiled: September 7, 1973Date of Patent: January 6, 1976Assignee: Sumitomo Chemical Company, LimitedInventors: Tsuneyuki Nagase, Gohu Suzukamo, Masami Fukao, Hirosuke Yoshioka