Patents by Inventor Mari Imamura
Mari Imamura 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: 9765004Abstract: A production method of ?,?-difluoroacetaldehyde according to the present invention includes reaction of an ?,?-difluoroacetic acid ester with hydrogen gas (H2) in the presence of a ruthenium catalyst. It is possible to selectively obtain ?,?-difluoroacetaldehyde as a partially reduced product of the hydrogenation reaction by the adoption of specific reaction conditions (in particular, reaction solvent and reaction temperature). This hydrogenation process can be alternative to the industrially unpractical hydride reduction process.Type: GrantFiled: August 3, 2016Date of Patent: September 19, 2017Assignee: Central Glass Company, LimitedInventors: Takashi Ootsuka, Mari Imamura, Akihiro Ishii, Koji Ueda, Shunsuke Mimura
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Publication number: 20160340284Abstract: A production method of ?,?-difluoroacetaldehyde according to the present invention includes reaction of an ?,?-difluoroacetic acid ester with hydrogen gas (H2) in the presence of a ruthenium catalyst. It is possible to selectively obtain ?,?-difluoroacetaldehyde as a partially reduced product of the hydrogenation reaction by the adoption of specific reaction conditions (in particular, reaction solvent and reaction temperature). This hydrogenation process can be alternative to the industrially unpractical hydride reduction process.Type: ApplicationFiled: August 3, 2016Publication date: November 24, 2016Inventors: Takashi OOTSUKA, Mari IMAMURA, Akihiro ISHII, Koji UEDA, Shunsuke MIMURA
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Patent number: 9440900Abstract: A production method of ?,?-difluoroacetaldehyde according to the present invention includes reaction of an ?,?-difluoroacetic acid ester with hydrogen gas (H2) in the presence of a ruthenium catalyst. It is possible to selectively obtain ?,?-difluoroacetaldehyde as a partially reduced product of the hydrogenation reaction by the adoption of specific reaction conditions (in particular, reaction solvent and reaction temperature). This hydrogenation process can be alternative to the industrially unpractical hydride reduction process.Type: GrantFiled: January 23, 2014Date of Patent: September 13, 2016Assignee: Central Glass Company, LimitedInventors: Takashi Ootsuka, Mari Imamura, Akihiro Ishii, Koji Ueda, Shunsuke Mimura
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Patent number: 9409843Abstract: A production method of a 1,1,1,5,5,5-hexafluoroacetylacetone hydrate according to the present invention includes: step 1: step 1: obtaining a reaction mixture that contains at least 1,1,1,5,5,5-hexafluoro-3-pentyn-2-one or an equivalent thereof by reaction of a 3,3,3-trifluoropropynyl metal with a trifluoroacetate; and step 2: forming the 1,1,1,5,5,5-hexafluoroacetylacetone hydrate by contact of the reaction mixture obtained in the step 1 with water in the presence of an acid. It is possible to produce 1,1,1,5,5,5-hexafluoroacetylacetone by dehydration of the thus-formed hydrate. Thus, the production method according to the present invention is industrially applicable.Type: GrantFiled: April 2, 2014Date of Patent: August 9, 2016Assignee: Central Glass Company, LimitedInventors: Takashi Ootsuka, Takashi Masuda, Akihiro Ishii, Mari Imamura, Shunsuke Mimura, Masato Kimura, Hiroshi Minesaki
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Publication number: 20160075626Abstract: A production method of a 1,1,1,5,5,5-hexafluoroacetylacetone hydrate according to the present invention includes: step 1: step 1: obtaining a reaction mixture that contains at least 1,1,1,5,5,5-hexafluoro-3-pentyn-2-one or an equivalent thereof by reaction of a 3,3,3-trifluoropropynyl metal with a trifluoroacetate; and step 2: forming the 1,1,1,5,5,5-hexafluoroacetylacetone hydrate by contact of the reaction mixture obtained in the step 1 with water in the presence of an acid. It is possible to produce 1,1,1,5,5,5-hexafluoroacetylacetone by dehydration of the thus-formed hydrate. Thus, the production method according to the present invention is industrially applicable.Type: ApplicationFiled: April 2, 2014Publication date: March 17, 2016Applicant: Central Glass Company LimitedInventors: Takashi OOTSUKA, Takashi MASUDA, Akihiro ISHII, Mari IMAMURA, Shunsuke MIMURA, Masato KIMURA, Hiroshi MINESAKI
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Patent number: 9284248Abstract: A production process of an ?-fluoroaldehyde according to the present invention includes reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a ruthenium complex. It is possible in the present invention to allow relatively easy industrial production of the ?-fluoroaldehyde and to directly obtain, as stable synthetic equivalents of the ?-fluoroaldehyde, not only a hydrate (as obtained by conventional techniques) but also a hemiacetal that is easy to purify and is of high value in synthetic applications. The present invention provides solutions to all problems in the conventional techniques and establishes the significantly useful process for production of the ?-fluoroaldehyde.Type: GrantFiled: March 25, 2015Date of Patent: March 15, 2016Assignee: Central Glass Company, LimitedInventors: Akihiro Ishii, Takashi Ootsuka, Mari Imamura, Takayuki Nishimiya, Kazuto Kimura
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Publication number: 20150329455Abstract: A production method of ?,?-difluoroacetaldehyde according to the present invention includes reaction of an ?,?-difluoroacetic acid ester with hydrogen gas (H2) in the presence of a ruthenium catalyst. It is possible to selectively obtain ?,?-difluoroacetaldehyde as a partially reduced product of the hydrogenation reaction by the adoption of specific reaction conditions (in particular, reaction solvent and reaction temperature). This hydrogenation process can be alternative to the industrially unpractical hydride reduction process.Type: ApplicationFiled: January 23, 2014Publication date: November 19, 2015Applicant: CENTRAL GLASS COMPANY, LIMITEDInventors: Takashi OOTSUKA, Mari IMAMURA, Akihiro ISHII, Koji UEDA, Shunsuke MIMURA
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Publication number: 20150197473Abstract: A production process of an ?-fluoroaldehyde according to the present invention includes reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a ruthenium complex. It is possible in the present invention to allow relatively easy industrial production of the ?-fluoroaldehyde and to directly obtain, as stable synthetic equivalents of the ?-fluoroaldehyde, not only a hydrate (as obtained by conventional techniques) but also a hemiacetal that is easy to purify and is of high value in synthetic applications. The present invention provides solutions to all problems in the conventional techniques and establishes the significantly useful process for production of the ?-fluoroaldehyde.Type: ApplicationFiled: March 25, 2015Publication date: July 16, 2015Inventors: Akihiro ISHII, Takashi OOTSUKA, Mari IMAMURA, Takayuki NISHIMIYA, Kazuto KIMURA
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Patent number: 9024075Abstract: A production process of an ?-fluoroaldehyde according to the present invention includes reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a ruthenium complex. It is possible in the present invention to allow relatively easy industrial production of the ?-fluoroaldehyde and to directly obtain, as stable synthetic equivalents of the ?-fluoroaldehyde, not only a hydrate (as obtained by conventional techniques) but also a hemiacetal that is easy to purify and is of high value in synthetic applications. The present invention provides solutions to all problems in the conventional techniques and establishes the significantly useful process for production of the ?-fluoroaldehyde.Type: GrantFiled: July 24, 2012Date of Patent: May 5, 2015Assignee: Central Glass Company, LimitedInventors: Akihiro Ishii, Takashi Ootsuka, Mari Imamura, Takayuki Nishimiya, Kazuto Kimura
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Publication number: 20140194654Abstract: A production process of an ?-fluoroaldehyde according to the present invention includes reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a ruthenium complex. It is possible in the present invention to allow relatively easy industrial production of the ?-fluoroaldehyde and to directly obtain, as stable synthetic equivalents of the ?-fluoroaldehyde, not only a hydrate (as obtained by conventional techniques) but also a hemiacetal that is easy to purify and is of high value in synthetic applications. The present invention provides solutions to all problems in the conventional techniques and establishes the significantly useful process for production of the ?-fluoroaldehyde.Type: ApplicationFiled: July 24, 2012Publication date: July 10, 2014Applicant: Central Glass Company, LimitedInventors: Akihiro Ishii, Takashi Ootsuka, Mari Imamura, Takayuki Nishimiya, Kazuto Kimura
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Patent number: 8658840Abstract: A production method of a ?-fluoroalcohol includes performing a reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a specific ruthenium complex (i.e. a ruthenium complex of the general formula [2], preferably a ruthenium complex of the general formula [4]). This production method can employ a suitable hydrogen pressure of 1 MPa or less by the use of such a specific ruthenium complex and does not require a high-pressure gas production facility when put in industrial practice. In addition, this production method can remarkably reduce the amount of catalyst used therein (to e.g. a substrate/catalyst ratio of 20,000) in comparison to the substrate/catalyst ratio conventional reduction of ?-fluoroalcohol. It is possible by these reduction in hydrogen pressure and catalyst amount to largely reduce the production cost of the ?-fluoroalcohol.Type: GrantFiled: January 27, 2012Date of Patent: February 25, 2014Assignee: Central Glass Company, LimitedInventors: Akihiro Ishii, Takashi Ootsuka, Takehisa Ishimaru, Mari Imamura
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Publication number: 20130303774Abstract: A production method of a ?-fluoroalcohol includes performing a reaction of an ?-fluoroester with hydrogen gas (H2) in the presence of a specific ruthenium complex (i.e. a ruthenium complex of the general formula [2], preferably a ruthenium complex of the general formula [4]). This production method can employ a suitable hydrogen pressure of 1 MPa or less by the use of such a specific ruthenium complex and does not require a high-pressure gas production facility when put in industrial practice. In addition, this production method can remarkably reduce the amount of catalyst used therein (to e.g. a substrate/catalyst ratio of 20,000) in comparison to the substrate/catalyst ratio conventional reduction of ?-fluoroalcohol. It is possible by these reduction in hydrogen pressure and catalyst amount to largely reduce the production cost of the ?-fluoroalcohol.Type: ApplicationFiled: January 27, 2012Publication date: November 14, 2013Applicant: Central Glass Company, LimitedInventors: Akihiro Ishii, Takashi Ootsuka, Takehisa Ishimaru, Mari Imamura