• 제목/요약/키워드: Cyclohexanedione

검색결과 21건 처리시간 0.026초

Spontaneous Formation of Revival Waves in the 1,4-Cyclohexanedione-Bromate-Ferroin Reaction

  • Huh, Do-Sung;Kim, Young-Joon;Kim, Hye-Sook;Kang, Jong-Kon;Choe, Sang-Joon
    • Bulletin of the Korean Chemical Society
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    • 제25권2호
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    • pp.267-270
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    • 2004
  • The bromate-1,4-cyclohexanedione-ferroin oscillating reactions are uncovered to support two types of wave activities, in which spontaneous formation of circular waves has been achieved after the disappearance of initial waves. The induction period of the revival wave is typically above 10 hours and its dependence on the initial concentrations of reactants is qualitatively different from that of initial waves. In addition to their differences in propagating speed and wavelength, the initial waves and the revival patterns have different colors, suggesting that different reaction mechanisms are involved in the formation of these spatiotemporal behaviors. Our experiments further show that the addition of hydroquinone to the reacting system can significantly shorten the induction time of the revival wave, which implicates that hydroquinone is not only a product in the bromate-1,4-cyclohexanedione-ferroin oscillating reaction but also plays a critical role in the following reactions.

Photochemical Formation of 3-Methoxycyclohex-2-en-1-ones from 1,3-Cyclohexanedione and 2-Allyl-3-hydroxycyclohex-2-en-1-one in Methanol in the Presence of Quinones

  • Kim, Sung-Sik;Chang, Ji-Ae;Kim, Ae-Rhan;Mah, Yoon-Jung;Kim, Hyun-Jin;Kang, Chan
    • Journal of Photoscience
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    • 제7권3호
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    • pp.111-114
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    • 2000
  • Irradiation of 1,3-cyclohexanedione and p-benzoquinone in methanol gave 3-methoxycyclohex-2-en-1-one. Allyl derivative of the 1,3-diketone was prepared as enol from and irradiated in methanol in the presence of p-benzoquinone to give the same type of photoproduct, i.e., 2-allyl-3-methoxycyclohex-2-en-1-one. Allyldibenzoylmethane was synthesized and irradiated with p-benzoauinone in methanol but no remarkable amount of photoproduct was obtained.

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A Green One-Pot Protocol for Regioselective Synthesis of New Substituted 7,8-Dihydrocinnoline-5(6H)-ones

  • Khalafy, Jabbar;Rimaz, Mehdi;Ezzati, Mahnaz;Prager, Rolf H.
    • Bulletin of the Korean Chemical Society
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    • 제33권9호
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    • pp.2890-2896
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    • 2012
  • A simple regioselective synthesis of cinnoline derivatives was achieved by a one-pot three component synthetic methodology. New substituted 7,8-dihydrocinnolin-5(6H)-ones are prepared via one-pot three component reaction of arylglyoxals with 1,3-cyclohexanedione and dimedone in the presence of hydrazine hydrate in moderate to good yields.

Tetracycline과 Flavonoid의 간단한 유도체 합성에 관한 연구 (A Study on the Syntheses of Simple Analogs of Tetracycline and Flavonoid)

  • 김학원
    • 대한화학회지
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    • 제40권8호
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    • pp.549-556
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    • 1996
  • 항생물질 tetracycline(TC)과 여러 가지 다양한 활성도를 보이는 flavonoid화합물들의 단순유도체들(13, 25, 26, 27)을 새로운 벙법으로 합성하였다, 먼저, 1,3-cyclohexanedione 유도체로부터 분자내 benzoyl group의 이동 반응을 이용하여 TC의 A, D ring이 유사한 bicyclic compound 13를 합성하였고, 0-methoxy benzaldehyde로부터 TC의 A, C ring이 유사한 bicyclic compound, 25와 chromone을 모핵으로 하는 flavonoid유도체, 26과 27을 합성하였다.

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수용액에서 폴리에틸렌 글리콜 촉매에 의한 1, 8-Dioxo-octahydroxanthene 유도체의 다용도적이며 실용적인 합성 (A Versatile and Practical Synthesis of 1, 8-Dioxo-octahydroxanthene Derivatives Catalyzed by Polyethylene Glycol (PEG) in Water)

  • Chavan, Abhijit P.
    • 대한화학회지
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    • 제53권4호
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    • pp.415-421
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    • 2009
  • 수용액에서 다양한 알데히드 5, 5-dimethyl-1, 3-cyclohexanedione을 이용한 1, 8-Dioxo-octahydroxanthene 유도체의 편리하고 실용적인 합성이 촉매인 폴리에틸렌 글리콜(PEG)하에서 성공적으로 수행되었다. 간단한 work-up, 깨끗한 생성물, 높은 수율, 친환경적인 용매인 물의 사용은 이 방법의 특색이다.

신규 cyclohexanedione계 화합물 EK3143과 EK3150의 제초작용 발현특성과 Acetyl CoA Carboxylase 활성에 미치는 효과 (Action Characteristics of EK3143 and EK3150, New Cyclohexanedione Herbicides, and Their Effects on Acetyl CoA Carboxylase Activity)

  • 김진석;송종환;조광연
    • 한국잡초학회지
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    • 제18권4호
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    • pp.314-324
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    • 1998
  • 신규로 합성한 cyclohexanedione계 화합물 EK3143과 EK3150의 제초작용 발현의 특성을 기존약제와 비교조사하고, 이들이 ACCase에 대해 어떠한 저해활성을 가지는지를 알아보고자 제반실험을 수행하였다. Sethoxydim은 화본과식물에만 제초효과를 가지며 생육정지와 함께 조직의 황화, 괴사가 나타난다, 반면에 Ek3143과 EK3150은 화본과식물에 대한 활성은 상대적으로 감소되었으나 까마중, 어저귀 등의 광엽잡초에 대해서는 보다 강한 활성을 가졌다. EK3143은 저농도의 보다 폭넓은 범위에서는 백화증상이, 고농도에서는 sethoxydim과 동일한 증상을 나타내었고 EK3150은 모든 농도에서 식물체의 백화를 유기시켰으며 광엽잡초의 경우 분열조직에서 그 증상이 뚜렷하였다. 이들 화합물의 화본과식물에 대한 생육저해 활성과 옥수수 ACCase에 대한 저해정도간에는 일치된 경향을 보였으나 광엽잡초인 어저귀와 까마중에 대한 ACCase 활성과 전식물체(intact plant)에서의 제초활성간에는 일치된 경향을 보이지 않았다. 즉 EK3143과 EK3150은 어저귀와 까마중의 ACCase에 대한 저해활성이 sethoxydim보다 전반적으로 높은 특징을 보이지만, 광엽잡초에 대한 제초활성이 상대적으로 높았던 EK3150이 ACCase에 대해서는 EK3143보다 오히려 낮은 저해활성을 나타내었다. 한편 색소감소 정도가 신장저해보다 빨리 나타나는 norflurazon 및 EK3140 처리에서와는 달리, EK3143과 EK3150 처리에서는 색소감소 보다 신장저해가 보다 빠르게 나타나 다른 저해양상을 보였다. 이상의 결과로 보아 EK3143 EK3150은 ACCase 이외에 다른 작용점을 추가로 저해하는 것으로 생각되며, 약간의 구조변경에따라 제초작용점간의 결합정도에 차이가 생김으로써 생육저해 또는 백화증상이 서로 비중을 달리하여 나타나는 것으로 추정된다.

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Spatial Symmetry Breaking in the Revival Wave of the Belousov-Zhabotinsky Reaction Containing 1,4-Cyclohexanedione

  • Basavaraja, C.;Kim, Na-Ri;Park, Hyun-Tae;Huh, Do-Sung
    • Bulletin of the Korean Chemical Society
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    • 제30권4호
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    • pp.907-912
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    • 2009
  • Complex breakup behavior in the revival wave has been observed in the Belousov-Zhabotinsky(BZ) reaction system containing 1,4-cyclohexanedione (1,4-CHD) in the dish divided into two compartments with a sliding window. A same reaction mixture is poured into the two compartments individually with time difference. Wave propagation exhibited different behavior in the revival wave of the reaction system. This was largely dependent on the progress time prior to the pouring into each compartment and on the gap between the times of pouring into the two compartments. The revival wave in the reaction system is induced spontaneously as a new wave train with a long time lag after the disappearance of the initially induced wave. A thoroughgoing study of the chaotic breakup of propagating chemical wave train was to be possible since the revival wave has a longer wavelength, clearer wave-train patterns, and longer duration period.

Organocatalytic Asymmetric Michael Addition of 1,3-Cyclohexanedione to Benzylidenemalonitriles

  • Suh, Chang Won;Kim, Dae Young
    • Bulletin of the Korean Chemical Society
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    • 제35권1호
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    • pp.98-102
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    • 2014
  • The organocatalytic enantioselective Michael addition reaction promoted by chiral binaphthyl-modified squaramide catalyst have been developed, allowing facile synthesis of the corresponding chiral 2-amino-4H-chromenes derivatives with excellent enantioselectivity (up to 99% ee). The method reported represents a practical entry for the preparation of chiral 2-amino-4H-chromenes derivatives.