- Synthesis of fluorinated block copolymers and their application as novel polymerisation surfactants in supercritical carbon dioxide
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Screened anionic copolymerisation of methyl methacrylate with the perfluoroalkyl methacrylates 2 affords well-defined AB block copolymers 4-6, which serve as effective surfactants in the dispersion polymerisation of methyl methacrylate in supercritical carbon dioxide.
- Yong, Tuck-Mun,Hems, William P.,Van Nunen, Johanna L. M.,Holmes, Andrew B.,Steinke, Joachim H. G.,Taylor, Philip L.,Segal, John A.,Griffin, David A.
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Read Online
- METHOD FOR PRODUCING FLUORINE-CONTAINING (METH) ACRYLATE
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To provide a method for producing fluorine-containing (meth) acrylate that allows a reaction to proceed under a mild condition and can be conducted conveniently and industrially.SOLUTION: A method for producing a fluorine-containing (meth) acrylate includes a process in which: a fluorine-containing alkyl iodide represented by general formula (1) and a (meth) acrylic acid metal salt are reacted with each other in a mixed solvent of organic solvent and water in the presence of a phase transfer catalyst. Rf-(CH2)n-I (1) (where, Rf is a C1-16 fluorinated aliphatic hydrocarbon group, n is an integer of 1-4).SELECTED DRAWING: None
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Paragraph 0043-0047; 0059
(2021/03/13)
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- Dehydrogenative Silylation of Alkenes for the Synthesis of Substituted Allylsilanes by Photoredox, Hydrogen-Atom Transfer, and Cobalt Catalysis
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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.
- Yu, Wan-Lei,Luo, Yong-Chun,Yan, Lei,Liu, Dan,Wang, Zhu-Yin,Xu, Peng-Fei
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supporting information
p. 10941 - 10945
(2019/07/17)
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- Cyanide-Free One-Pot Synthesis of Methacrylic Esters from Acetone
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Methacrylic esters, represented by methyl methacrylate (MMA), are widely used as commodity chemicals. Here, the one-pot synthesis of methacrylic esters from acetone, a haloform and alcohols in the presence of an organic base is described. Using DBU as the organic base for the reaction of acetone, chloroform and methanol in acetonitrile afforded MMA in 66 % yield. When the solvent was replaced by benzonitrile, the product MMA was successfully purified by distillation. Applicability of this process to various alcohols was also investigated to show ethyl, phenyl, CF3CH2, and n-C6F13CH2CH2 esters were obtained in moderate yields. The use of bromoform instead of chloroform resulted in the improvement of the yield, for example, methyl and n-C6F13CH2CH2 esters up to 81 and 70 %, respectively. The reaction with deuterated starting materials acetone-d6 and MeOH-d4, with DBU in acetonitrile afforded deuterated MMA (MMA-d8) in 70 % yield.
- Koyama, Minoru,Kawakami, Takafumi,Okazoe, Takashi,Nozaki, Kyoko
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p. 10913 - 10917
(2019/08/02)
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- METHOD FOR PRODUCING UNSATURATED ACID AND/OR UNSATURATED ACID ESTER
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The present invention relates to a method for producing an unsaturated acid and/or an unsaturated acid ester, containing a process A of reacting a compound (1) represented by the following formula (1) at a temperature of 0° C. to 350° C. in the presence of a Br?nsted acid catalyst and/or a Lewis acid catalyst, to prepare a compound (2) represented by the following formula (2); in which each of R1, R2 and R4 independently represents a hydrogen atom, a deuterium atom or an alkyl group; each of R3 and R5 independently represents a hydrogen atom or a deuterium atom; R6 represents a hydrogen atom, a deuterium atom, or an alkyl group or an aryl group; and X represents a chlorine atom, a fluorine atom, a bromine atom, or an iodine atom.
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Paragraph 0110-0111
(2015/07/02)
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- PROCESS FOR PRODUCING ESTER COMPOUND
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PROBLEM To provide an environmentally-friendly method for producing industrially an ester compound. SOLUTION The present invention is a method for producing an ester compound which comprises subjecting a carboxylic acid and an alcohol to dehydration-condensation reaction using an involatile acid catalyst and then removing the residual acid catalyst by bringing a weak basic substance into contact with the residual acid catalyst.
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Page/Page column 15
(2010/12/31)
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- Process for producing a polyfluoroalkyl (meth)acrylate
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A process for producing a polyfluoroalkyl (meth)acrylate, which comprises isolating, from a reaction mixture containing a polyfluoroalkyl (meth)acrylate obtained by reacting a polyfluoroalkyl iodide of the formula CnF2n+1(CH2)mI (wherein n is an integer of from 2 to 7, and m is an integer of from 1 to 4) with a metal (meth)acrylate in tert-butanol, said polyfluoroalkyl (meth)acrylate by the following steps (1) to (3):(1) a step of taking out a crude liquid from the reaction mixture by solid-liquid separation;(2) a step of distilling the crude liquid to separate it into compound group A of compounds having a lower boiling point than the polyfluoroalkyl (meth)acrylate and compound group B of the polyfluoroalkyl (meth)acrylate and compounds having a higher boiling point than the polyfluoroalkyl (meth)acrylate; and(3) a step of distilling and purifying the polyfluoroalkyl (meth)acrylate from the compound group B in the presence of a polymerization inhibitor.
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- Synthesis and characterization of semifluorinated polymers via group transfer polymerization
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Group transfer polymerization (GTP) was used to prepare semifluorinated polymers based on acrylic and methacrylic monomers. In the first case, electrophilic catalyzed GTP was applied with 1-methoxy-2-methyl-1-trimethylsilyloxy-1-propene (MMTP) as initiator, zinc iodide as catalyst and 1H,1H,2H,2H-perfluorooctyl acrylate as monomer. In this way it has been possible to obtain oligomers. Higher molecular weight polymers were prepared by means of the nucleophilic tetrabutylammonium benzoate as catalyst. With MMTP as initiator, 1H,1H,2H,2H-perfluoroalkyl methacrylates, F(CF2)m(CH2)2OCOC(CH3)=CH2, were polymerized to molecular weights > 4.5 kg mol-1. The polydispersity was found to depend strongly on the length of the perfuoroalkyl side chain, i.e. Mw/Mn decreases with increasing m.
- Krupers, Maarten J.,Moeller, Martin
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p. 119 - 124
(2007/10/03)
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Several fluorinated and chlorofluorinated acrylates and methacrylates were synthesized from the alcohols RFCH2OH with RF=CCl3, CHClCH2CCl3, (CF2CFCl)nCl, (C2F4)nH, CF3, C7F15 and C6F13CH2. The corresponding polymers were also studied for their application as transparent polymeric materials. For this purpose the refractive indices n20D of the monomers and the polymers were measured as were the Tg values of the polymers. A study of their infrared spectra shows to what extent these products could be utilized taking into consideration their absorption in the long wavelength range between 0.85 and 1.50 m. The refractive indices of these polymers, which are reduced when increasing the number of fluorine atoms in the molecule, and that of the Tg measured between 50 and 70° C for the fluorinated methacrylates, indicate a potential use of these polymers as sheathing materials for optical fibres.
- Boutevin,Rigal,Rousseau,Bosc
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