97-88-1Relevant articles and documents
Dehydrogenative Silylation of Alkenes for the Synthesis of Substituted Allylsilanes by Photoredox, Hydrogen-Atom Transfer, and Cobalt Catalysis
Yu, Wan-Lei,Luo, Yong-Chun,Yan, Lei,Liu, Dan,Wang, Zhu-Yin,Xu, Peng-Fei
supporting information, p. 10941 - 10945 (2019/07/17)
A synergistic catalytic method combining photoredox catalysis, hydrogen-atom transfer, and proton-reduction catalysis for the dehydrogenative silylation of alkenes was developed. With this approach, a highly concise route to substituted allylsilanes has been achieved under very mild reaction conditions without using oxidants. This transformation features good to excellent yields, operational simplicity, and high atom economy. Based on control experiments, a possible reaction mechanism is proposed.
Silica-Supported MnII Sites as Efficient Catalysts for Carbonyl Hydroboration, Hydrosilylation, and Transesterification
Ghaffari, Behnaz,Mendes-Burak, Jorge,Chan, Ka Wing,Copéret, Christophe
supporting information, p. 13869 - 13873 (2019/11/11)
Manganese, the third most abundant transition-metal element after iron and titanium, has recently been demonstrated to be an effective homogeneous catalyst in numerous reactions. Herein, the preparation of silica-supported MnII sites is reported using Surface Organometallic Chemistry (SOMC), combined with tailored thermolytic molecular precursors approach based on Mn2[OSi(OtBu)3]4 and Mn{N(SiMe3)2}2?THF. These supported MnII sites, free of organic ligands, efficiently catalyze numerous reactions: hydroboration and hydrosilylation of ketones and aldehydes as well as the transesterification of industrially relevant substrates.
METHOD FOR THE PRODUCTION PROCESS OF METHACRYL ACID ESTER
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Paragraph 0045; 0048; 0049, (2017/06/02)
The present invention relates to a method of preparing a methacrylic acid ester by performing a transesterification reaction while air blowing an alkyl methacrylic acid ester and an alcohol in the presence of a catalyst represented by chemical formula 1, to prepare a methacrylic acid ester. According to the present invention, a method of preparing a methacrylic acid ester may prevent a polymer from being generated and also increase yield when preparing a methacrylic acid ester without using an additional polymerization inhibitor.
METHOD FOR THE PRODUCTION PROCESS OF BUTYL METHACRYLATE
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Paragraph 0028-0030, (2017/01/09)
The present invention relates to a preparation method of butyl methacrylate, which comprises the steps of: a) preparing butyl methacrylate through ester exchange reaction of n-butanol and methyl methacrylate in the presence of titanium tetrabutoxide catalyst; and b) removing the catalyst by adding glycerol to butyl methacrylate after the ester exchange reaction. The preparation method of butyl methacrylate in the present invention improves removal rate of residual solvents remaining after recovering the products after the ester exchange reaction, and has the catalyst removal process at low costs.COPYRIGHT KIPO 2016
METHOD FOR THE PRODUCTION PROCESS OF METHACRYL ACID ESTER
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Paragraph 0037-0040, (2017/02/09)
The present invention relates to a preparation method of methacrylic acid ester. The preparation method of methacrylic acid ester comprises the steps of: a) preparing methacrylic ester by having an ester exchange reaction of alcohol and alkyl methacrylic acid ester in presence of an ester exchange catalyst and a polymerization inhibitor; and b) removing the catalyst by adding methanol and water after the ester exchange reaction. The preparation method of the present invention can improve removal rate while using easily obtainable water and methanol which is one of the products of the reaction.COPYRIGHT KIPO 2016
Method of manufacturing methacrylic acid ester
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Paragraph 0073; 0074; 0075; 0082, (2017/04/04)
The present invention relates to a method for producing methacrylic acid ester. More specifically, the present invention relates to a method for producing methacrylic acid ester, by carrying out an ester interchange reaction between methacrylate and alcohol in the presence of a catalyst and a polymerization inhibitor, which includes a step of calculating an equation for the degree of catalyst inactivity from a variable of the ester interchange reaction.(AA) Degree of catalyst inactivity, andPhi;(BB) Single input variable, andeta;COPYRIGHT KIPO 2016
METHOD FOR THE PRODUCTION PROCESS OF METHACRYL ACID
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Paragraph 0003; 0048-0051, (2017/06/02)
The present invention relates to a continuous production method of butyl (meth)acrylate, in which methyl (meth)acrylate and butanol undergo an ester exchange reaction in the presence of an ester exchange catalyst and a polymerization inhibitor, and gasified unreacted methyl(meth)acrylate and produced methanol, through the ester exchange reaction, are removed as an azeotropic mixture from an azeotropic tower. In the continuous production method of butyl (meth)acrylate, the reflux ratio is controlled such that temperatures inside the azeotropic tower, converted to temperatures at atmospheric pressure, remain in the following ranges: 64-65anddeg;C at the uppermost part, 65-89anddeg;C at the middle part, and 89-102anddeg;C at the bottom part, and the azeotropic mixture contains 10 ppm or less of butanol. The amount of butanol contained in the azeotropic mixture to be removed from the azeotropic tower is minimized, and thus the continuous production method of butyl (meth)acrylate of the present invention has the advantage of eliminating the need for a separate isolation process.COPYRIGHT KIPO 2016
Process for preparation of methyl methacrylate by esterification during oxidation
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Paragraph 0126, (2014/09/17)
The invention relates to a process for preparation of methacrylic acid, comprising the steps: a) providing a feed composition comprising a main compound selected from isobutylene and tert-butyl alcohol and at least one co-compound selected from the group consisting of methanol, dimethyl ether and formaldehyde; b) subjecting the feed composition provided in step a) with at least a first part of said at least one co-compound to a catalytic reaction zone and obtaining an oxidation phase comprising methyl methacrylate and methacrylic acid. The invention also relates a process for preparation of methyl methacrylate, further comprising the step of: c) esterification of at least a part of the oxidation phase obtained in step b), to an apparatus for preparation of methacrylic acid, to an apparatus for preparation of methyl methacrylate, to a process carried out in the apparatus, to methacrylic acid, to methyl methacrylate, to methacrylate esters, to a process for preparation of a polymer comprising at least one methacrylic acid, methyl methacrylate and/or methacrylate ester monomer unit, to a polymer comprising at least one methacrylic acid, methyl methacrylate and/or methacrylate ester monomer, to a process for preparation of a composition, to a composition, to chemical products, and to the use of at least one of methacrylic acid, methyl methacrylate, methacrylate ester, a polymer and/or a composition in chemical products.
Aerobic oxidative esterification of aldehydes with alcohols by gold-nickel oxide nanoparticle catalysts with a core-shell structure
Suzuki, Ken,Yamaguchi, Tatsuo,Matsushita, Ken,Iitsuka, Chihiro,Miura, Junichi,Akaogi, Takayuki,Ishida, Hiroshi
, p. 1845 - 1849 (2013/09/02)
Oxidative esterification of aldehydes with alcohols proceeds with high efficiency in the presence of molecular oxygen on supported gold-nickel oxide (AuNiOx) nanoparticle catalysts. The method is environmentally benign because it requires only molecular oxygen as the terminal oxidant and gives water as the side product. The AuNiOx nanoparticles have a core-shell structure, with the Au nanoparticles at the core and the surface covered by highly oxidized NiOx. Aerobic oxidative esterification of methacrolein in methanol to methyl methacrylate is an important industrial method for the production of polymethyl methacrylate.
Fluidic devices comprising photocontrollable units
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, (2011/11/13)
Photochromic materials that are useful for a variety of applications, including for making various unit functions of fluidic devices, particularly microfluidic devices, such as microchannels, valves and gates, using spiropyran materials, such as a polymeric composition comprising a spiropyran. In certain disclosed embodiments the spiropyran is admixed with a polymeric material. For example, the spiropyran may be intercalated into a polyalkylene or polyalkylene phthalate. The spiropyran also may be polymerized with at least one additional monomer to form a heteropolymer, such as by polymerization with styrene, styrene derivatives, acrylate and acrylate derivatives. The spiropyran compositions can be used to make, for example, a photoactuatable valve, a fluidic channel, etc. The valve may be associated with a microchannel, including photochromic microchannel. In certain disclosed embodiments, the valve, at least one microchannel, or both, are re-patternable by light exposure. Embodiments of a method for using a photochromic material in a microfluidic device also are disclosed. One disclosed embodiment concerns providing a microfluidic device comprising at least one re-patternable microchannel defined by a spiropyran photochromic material, at least one photoactuatable valve comprising the same or a different spiropyran photochromic material, or both. Spiropyran photochromic material is serially exposed to light of different wavelengths to move a fluid, to actuate a gate or valve, or both.