• Title/Summary/Keyword: chemical reduction

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Selective Reduction of $\alpha,\beta$-Unsaturated Ketones with Borohydride Exchange Resin-$CuSO_4$ in Methanol

  • Yoon, Nung-Min;Sim, Tae-Bo
    • Bulletin of the Korean Chemical Society
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    • v.14 no.6
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    • pp.749-752
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    • 1993

  • Borohydride exchange resin $(BER)-CuSO_4$ system readily reduces {\alpha},{\beta}$-unsaturated ketones to the corresponding saturated alcohols quantitatively. This reduction tolerates many functional groups such as carbon-carbon multiple bonds, chlorides, epoxides, esters, amides and nitriles.

  • https://doi.org/10.5012/bkcs.1993.14.6.749 인용 PDF

Analysis of Reduction Factors to Creep Deformation of Reinforced Geosynthetics

  • Jeon, Han-Yong;Yuu, Jung-Jo;Mok, Mun-Sung
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10a
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    • pp.104-104
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    • 2003

  • Geosynthetic Reinforcements - membrane drawn type, warp/knitted type, junction bonded type and composite type geogrids, strip type reinforcement - were used to compare the long-term perfor-mance by total factor of safety with reduction factors during service periods. To evaluate the reduction factors, wide-width tensile property, installation damage, creep deformation, chemical and biological degradation tests were performed. Long-term design strengths of geosynthetic reinforcements were calculated by using GRI standard Test Method GG4.

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Electrochemical Reduction of Oxygen at Co(II)-3,4-bis (salicylidene diimine)toluene Complex supported Glassy Carbon Electrode

  • 최용국;조기형;박경희
    • Bulletin of the Korean Chemical Society
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    • v.16 no.1
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    • pp.21-26
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    • 1995

  • Electrochemical reduction of oxygen has been carried out at glassy carbon electrode and carbon ultramicroelectrode, the surface of which is modified with a new Co(Ⅱ)-Schiff base complex, Co(Ⅱ)-3,4-bis(salicylidene diimine)toluene in 1 M KOH solution. The results obtained from cyclic voltammetric and chronoamperometric experiments are consistent with the formation of the reasonably stable superoxide ions as a primary electron transfer reaction product. The exchange rate constant obtained for oxygen reduction is about 0.02 cm/s.

  • https://doi.org/10.5012/bkcs.1995.16.1.21 인용 PDF