• 제목/요약/키워드: Ruthenium catalyst

검색결과 59건 처리시간 0.021초

Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes

  • Ura, Yasuyuki;Tsujita, Hiroshi;Mitsudo, Take-Aki;Kondo, Teruyuki
    • Bulletin of the Korean Chemical Society
    • /
    • 제28권12호
    • /
    • pp.2139-2152
    • /
    • 2007
  • Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products. In this review, our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed: 1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy = 2,2':6',2''-terpyridine] or [RuCl2(η6-C6H6)]2/Zn in alcohols, 2) A novel synthesis of 2-alkylidenetetrahydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts, such as Ru(η4-cod)(η6-cot) [cod = 1,5-cyclooctadiene, cot = 1,3,5-cyclooctatriene] and Ru(η6-cot)(η2-dmfm)2 [dmfm = dimethyl fumarate], 3) Regio- and stereoselective synthesis of enamides by Ru(η6-cot)(η2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes, and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(η6-cot)(η2-dmfm)2 catalyst in the presence of primary alcohols.

루테늄 지르코니아 불균일 촉매를 이용한 알켄 또는 알킨의 효과적인 산화절단반응 (Efficient Oxidative Scission of Alkenes or Alkynes with Heterogeneous Ruthenium Zirconia Catalyst)

  • 모비나 이르샤드;최봉길;강온유;홍석복;황성연;허영민;김정원
    • 공업화학
    • /
    • 제27권6호
    • /
    • pp.659-663
    • /
    • 2016
  • 알켄 또는 알킨의 산화 반응이 루테늄 지르코니아 불균일 촉매에 의해 매우 선택적이며 효율적으로 전환되었다. 절단반응을 통해, C-C 이중 결합은 알데히드 관능기로, 삼중 결합은 다이케톤 또는 카르복시산으로 전환되었는데, 다양한 기질들이 $30^{\circ}C$에서 $PhI(OAc)_2$ 산화제와 dichloromethane 및 물(각각 5 mL와 0.5 mL)의 혼합 용매 조건에서 반응이 수행되었다. 사용된 촉매 $Ru(OH)_x/ZrO_2$는 이 절단 반응에 대해 기존의 다른 루테늄 기반 불균일 또는 균일 촉매들보다 더 좋은 활성과 선택성을 보였다. 반응이 진행되는 동안, 제조된 촉매의 기계적인 물성은 안정적이었고, 금속의 침출은 전혀 보이지 않았다. 불포화된 탄화수소들의 산화적 절단에 대해, 합성된 촉매는 여러 번 재사용해도 그 촉매의 성능을 그대로 유지하였다.

Ruthenium Complex Catalyzed Syntehesis of Diamino Compounds from ${\alpha},{\omega}$-Diols and Secondary Amines

  • Keun-Tae Huh;Sang Chul Shim;Chll Hoon Doh
    • Bulletin of the Korean Chemical Society
    • /
    • 제11권1호
    • /
    • pp.45-49
    • /
    • 1990
  • ${\alpha},{\omega}$-Diols react with secondary amines in the presence of a catalytic amount of ruthenium catalyst at $180^{\circ}C$ to give diamino compounds in good to excellent yields. The yield of diamino compound was affected by the molar ratio of ${\alpha},{\omega}$-diol to secondary amine. The reaction is affected by the nature of the phosphorus ligands employed and the effectiveness of the added ligand is completely different depending on the chain length of the ${\alpha},{\omega}$-diol. The reaction between ethylene glycol and primary amine in the presence of a catalytic amount of ruthenium catalyst gave 1,4-disubstituted piperazine.