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Hong Dae Choi - One of the best experts on this subject based on the ideXlab platform.

  • 5-Bromo-2-phenyl-3-phenyl-sulfinyl-1-benzofuran.
    Acta crystallographica. Section E Structure reports online, 2009
    Co-Authors: Hong Dae Choi
    Abstract:

    In the title compound, C(20)H(13)BrO(2)S, the O atom and the phenyl group of the phenyl-sulfinyl substituent are located on opposite sides of the plane of the benzofuran system. The S-bound phenyl ring is almost perpendicular to this plane [80.35 (8)°]. The phenyl ring in the 2-position is twisted with respect to the benzofuran plane, making a dihedral angle of 16.0 (1)°.

  • 5-Chloro-2-phenyl-3-phenyl-sulfinyl-1-benzofuran.
    Acta crystallographica. Section E Structure reports online, 2009
    Co-Authors: Hong Dae Choi
    Abstract:

    In the title compound, C(20)H(13)ClO(2)S, the O atom and the phenyl group of the phenyl-sulfinyl substituent lie on opposite sides of the plane of the benzofuran fragment; the S-bound phenyl ring is nearly perpendicular to this plane [80.87 (5)°]. The phenyl ring in the 2-position is rotated out of the benzofuran plane, making a dihedral angle of 17.43 (7)°. The crystal structure features π-π inter-actions between the phenyl ring and the furyl ring of a neighbouring benzofuran system [centroid-centroid distance = 3.886 (2) Å].

  • 2-Phenyl-3-(phenyl-sulfin-yl)naphtho[1,2-b]furan.
    Acta Crystallographica Section E-structure Reports Online, 2009
    Co-Authors: Hong Dae Choi
    Abstract:

    In the title compound, C24H16O2S, the O atom and the phenyl group of the phenyl­sulfinyl substituent lie on opposite sides of the plane of the naphthofuran fragment; the phenyl ring is almost perpendicular to this plane [81.54 (5)°]. The 2-phenyl ring is rotated out of the naphthofuran plane, making a dihedral angle of 18.2 (1)°.

  • 2-Phenyl-1-(phenyl-sulfin-yl)naphtho[2,1-b]furan.
    Acta Crystallographica Section E-structure Reports Online, 2009
    Co-Authors: Hong Dae Choi
    Abstract:

    In the title compound, C24H16O2S, the O atom and the phenyl group of the phenyl­sulfinyl substituent lie on opposite sides of the plane of the naphthofuran fragment; the phenyl ring is almost perpendicular to this plane [82.34 (5)°]. The 2-phenyl ring is rotated out of the naphthofuran plane making a dihedral angle of 48.21 (6)°. The crystal structure shows π–π inter­actions between the central benzene rings of adjacent mol­ecules [centroid–centroid distance = 3.516 (3) A], as well as non-classical C—H⋯O hydrogen bonds.

Qinhui Wang - One of the best experts on this subject based on the ideXlab platform.

  • mild hydrotreatment of low temperature coal tar distillate product composition
    Chemical Engineering Journal, 2014
    Co-Authors: Wei Tang, Mengxiang Fang, Hongyan Wang, Panlong Yu, Qinhui Wang
    Abstract:

    Abstract The hydrogenation of low temperature coal tar was carried out over a MoNiWP/Al 2 O 3 catalyst under mild conditions to produce clean liquid fuel. The effects of temperature, pressure and liquid hourly space velocity (LHSV) on product composition were determined by FT-IR and GC–MS analysis. The feedstock and products were classified into several groups according to saturation level to probe the reaction mechanisms of the main aromatic compounds in coal tar. At 375 °C, 6 MPa and LHSV of 0.4 h −1 , alkyl-phenols and alkyl-naphthalenes were transformed into cycloalkanes and phenyl cycloalkanes with the yield of 60.4% and 83.9%, respectively. The properties of feedstock were clearly upgraded after hydrotreatment. Methyl substitution on aromatic rings negatively influenced to the conversion of phenyl cycloalkanes to bicyclic alkanes by inhibiting hydrogenation of the aromatic ring. In contrast to previous research on model components, phenyl olefins appeared to be the final product of alkyl-naphthalenes hydrogenation. The transformation of bicyclic compounds to monocyclic compounds was insignificant. Based on these results, a reaction scheme of aromatic compounds in coal tar distillate was proposed.

Lars Eriksson - One of the best experts on this subject based on the ideXlab platform.

H. Matloubi - One of the best experts on this subject based on the ideXlab platform.

Youngyoun Ji - One of the best experts on this subject based on the ideXlab platform.

  • Flame‐retardant ABS resins from novel phenyl isocyanate blocked novolac phenols and triphenyl phosphate
    Journal of Applied Polymer Science, 2020
    Co-Authors: Youngyoun Ji
    Abstract:

    In an effort to prepare a novel novolac phenol (NP) based char former with good solubility, the hydroxyl functionalities of NP were blocked with phenyl isocyanate (PI) via a simple urethane-forming reaction. The chemical structure and properties of the obtained novolac phenol–phenyl isocyanate adduct (NP–PI) were characterized with gel permeation chromatography, Fourier transform infrared spectroscopy, 1H-NMR, and differential scanning calorimetry. Adducts of two kinds of NPs (molecular weights = 450 and 800) with PI were used as potential char formers for this study. Thus, a two-component system using NP–PI as a char former and triphenyl phosphate (TPP) as a phosphorous-based flame retardant was blended with ABS, and the thermal degradation behavior and flame retardance were examined as a function of the molar mass of NP–PI and the TPP/NP–PI ratio with thermogravimetric analysis and limiting oxygen index (LOI) testing. ABS compositions with no NP–PI were also prepared for comparison. The mixtures showed a synergistic effect between TPP and NP–PI on the flame-retardance enhancement of ABS. Those containing the higher molar mass NP–PI adduct were the most flame retardant, and a LOI value as high as 41 was obtained. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 721–728, 2006

  • flame retardant abs resins from novel phenyl isocyanate blocked novolac phenols and triphenyl phosphate
    Journal of Applied Polymer Science, 2006
    Co-Authors: Youngyoun Ji
    Abstract:

    In an effort to prepare a novel novolac phenol (NP) based char former with good solubility, the hydroxyl functionalities of NP were blocked with phenyl isocyanate (PI) via a simple urethane-forming reaction. The chemical structure and properties of the obtained novolac phenol–phenyl isocyanate adduct (NP–PI) were characterized with gel permeation chromatography, Fourier transform infrared spectroscopy, 1H-NMR, and differential scanning calorimetry. Adducts of two kinds of NPs (molecular weights = 450 and 800) with PI were used as potential char formers for this study. Thus, a two-component system using NP–PI as a char former and triphenyl phosphate (TPP) as a phosphorous-based flame retardant was blended with ABS, and the thermal degradation behavior and flame retardance were examined as a function of the molar mass of NP–PI and the TPP/NP–PI ratio with thermogravimetric analysis and limiting oxygen index (LOI) testing. ABS compositions with no NP–PI were also prepared for comparison. The mixtures showed a synergistic effect between TPP and NP–PI on the flame-retardance enhancement of ABS. Those containing the higher molar mass NP–PI adduct were the most flame retardant, and a LOI value as high as 41 was obtained. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 721–728, 2006