- Method for preparing 2-chloromaleic anhydride
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The invention relates to the technical field of organic synthesis, in particular to a method for preparing 2-chloromaleic anhydride, which comprises the following steps of adding maleic anhydride intoa reaction bottle, heating until the solid is molten, adding ferric trichloride, and pumping the reaction solution into a mixing module by using a pump, introducing chlorine into the mixing module, heating the micro-channel reaction module, and enabling reaction liquid in the mixing module to pass through the micro-channel reaction module at a certain flow rate, then connecting a micro-reactor with a fixed bed, heating the micro-reactor, introducing the reaction liquid passing through the micro-channel reactor into the fixed bed micro-reactor for reaction by adopting a mixed catalyst consisting of barium chloride and activated carbon, introducing nitrogen at a certain rate, taking away hydrogen chloride gas generated by the reaction, and collecting the reaction liquid, and distilling to obtain the 2-chloromaleic anhydride. The mixed catalyst composed of barium chloride and activated carbon is adopted, the reaction speed is high, the product yield and purity are high, and the requirement for equipment is lowered.
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Paragraph 0030-0037
(2021/02/06)
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- A dinuclear iron(II) complex bearing multidentate pyridinyl ligand: Synthesis, characterization and its catalysis on the hydroxylation of aromatic compounds
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A dinuclear iron(II) complex Fe2L2(μ2-Cl)2Cl2 (L = N,N-bis(pyridin-2-ylmethyl)prop-2-yn-1-amine) was prepared and fully characterized by UV–Vis spectroscopy, elemental analysis, electrochemical analysis and X-ray single crystal diffraction analysis. The catalytic activity of the complex was assessed for the hydroxylation of aromatic compounds by using aqueous H2O2 as an oxidant in acetonitrile. The catalytic system was applicable in a wide range of substrates including aromatic compounds with both electron-donating and electron-withdrawing substituents and showed moderate to good catalytic activity and selectivity in the oxidation reactions. Particularly, in the case of benzene the selectivity of phenol achieve to 74% with the reaction conversion of 24.8%.
- Gu, Erxing,Zhong, Wei,Ma, Hongxia,Xu, Beibei,Wang, Hailong,Liu, Xiaoming
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p. 159 - 165
(2018/03/29)
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- CRYSTAL STRUCTURE OF N-(2,6-DIMETHYLPHENYL)CHLOROMALEINIMIDE
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The crystal structure of N-(2,6-dimethylphenyl)chloromaleinimide solved by the heavy atom method was refined by the 9*9 block-diagonal matrix least squares method to a final R value 0.08 for 1147 observed diffractions.The compound crystallizes in the orthorhombic system with Pbca group and lattice parameters a=13.622(4), b=13.483(7), c=12.768(6) Angstroem, Z=8.Monomeric units, between which interactions of type Cl...H-C and O...H-C occured, formed the crystal structure.Both moieties of the molecule, i.e. the phenyl and the five-membered maleinimide rings were foundto be virtually planar and the central planes intersecting these rings form an angle 78.3 deg.
- Vrabel, Viktor,Kelloe, Eleonora,Lokaj, Jan,Konecny, Vaclav
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p. 2408 - 2414
(2007/10/02)
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