• 제목/요약/키워드: bromination

검색결과 60건 처리시간 0.025초

The radical bromination reaction of ethylenecarbonate

  • Moon, Do-Won
    • Archives of Pharmacal Research
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    • 제6권1호
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    • pp.1-6
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    • 1983
  • The reaction of ethylenecarbonate (I) with bromine was carried out in the presence of benzolperoxide as radical initiator. The following several different esters being ring opened were obtained; bromoacetyl-bromoformate, (1-hyroxy, 1, 2-dibromo)-ethyl bromoformate, (1-hydroxy, 1, 2, 2'-tribromo)diethylacarbonate, 2-bromoethyl-tribromoacetate, (1-acetoxy, 1'-bromomethyl)-bromomalo nate, 2-bromoethyl-bromoacetoxy-tribromoacetate.

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A Green Protocol for the Bromination and Iodination of the Aromatic Compounds using H5IO6/NaBr and H5IO6/NaI in the Water

  • Yousefi-Seyf, Jaber;Tajeian, Kazem;Kolvari, Eskandar;Koukabi, Nadiya;Khazaei, Ardeshir;Zolfigol, Mohammad Ali
    • Bulletin of the Korean Chemical Society
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    • 제33권8호
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    • pp.2619-2622
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    • 2012
  • Bromination and iodination of the aromatic compounds have efficiently been carried out at room temperature and $70^{\circ}C$, respectively, in short reaction times using orthoperiodic acid/sodium bromide (1:2) and orthoperiodic acid/sodium iodide (1:2) in water to prepare the corresponding halo compounds with excellent yields.

Molecular Dynamics Simulations of Graphite-Vinylester Nanocomposites and Their Constituents

  • Alkhateb, H.;Al-Ostaz, A.;Cheng, A.H.D.
    • Carbon letters
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    • 제11권4호
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    • pp.316-324
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    • 2010
  • The effects of geometrical parameters on mechanical properties of graphite-vinylester nanocomposites and their constituents (matrix, reinforcement and interface) are studied using molecular dynamics (MD) simulations. Young's modulii of 1.3 TPa and 1.16 TPa are obtained for graphene layer and for graphite layers respectively. Interfacial shear strength resulting from the molecular dynamic (MD) simulations for graphene-vinylester is found to be 256 MPa compared to 126 MPa for graphitevinylester. MD simulations prove that exfoliation improves mechanical properties of graphite nanoplatelet vinylester nanocomposites. Also, the effects of bromination on the mechanical properties of vinylester and interfacial strength of the graphene.brominated vinylester nanocomposites are investigated. MD simulation revealed that, although there is minimal effect of bromination on mechanical properties of pure vinylester, bromination tends to enhance interfacial shear strength between graphite-brominated vinylester/graphene-brominated vinylester in a considerable magnitude.

Benzylic Brominations with N-Bromosuccinimide in 1,2-Dichlorobenzene: Effective Preparation of (2-Bromomethyl-phenyl)-Methoxyiminoacetic Acid Methyl Ester

  • Lee, Sanghyuck;Ra, Choon Sup
    • 청정기술
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    • 제22권4호
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    • pp.269-273
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    • 2016
  • The benzylic bromination of methoxyimino-o-tolyl-acetic acid methyl ester (1) into (2-bromomethyl-phenyl)-methoxyimino-acetic acid methyl ester (2) using N-bromosuccinimide in the presence of 2,2'-azobisisobutyronitrile in various reaction solvents were investigated. The efficiency of the reaction was found to be sensitive to the kind of reaction solvents. We found the benzylic bromination of 1 to 2 can be performed in 1,2-dichlorobenzene as reaction solvent superior to the classic Wohl-Ziegler procedure in both reaction time and isolated yield (8 h vs 12 h, 92 vs 79%). This system provides clean, rapid, and high-yielding reactions with replacement of conventional solvents, such as tetrachloromethane, by less-toxic 1,2-dichlorobenzene.