197155-50-3Relevant articles and documents
A medium fluorous Grubbs-Hoveyda 2nd generation catalyst for phase transfer catalysis of ring closing metathesis reactions
Kobayashi, Yuki,Inukai, Sae,Kondo, Natsuki,Watanabe, Tomoko,Sugiyama, Yuya,Hamamoto, Hiromi,Shioiri, Takayuki,Matsugi, Masato
supporting information, p. 1363 - 1366 (2015/03/04)
A fluorous Grubbs-Hoveyda metathesis catalyst supported on Teflon powder, that readily moves between the solid phase (Teflon) and the liquid phase (DMF) was prepared. By modulating the hydrophobicity of the reaction medium at the end of the reaction, the supported catalyst could be recovered by simple filtration even though the catalyst existed in a homogeneous state during the reaction. In RCM reactions, the catalyst could be reused up to three times with only a slight loss in reactivity with each subsequent cycle.
Synthesis and reactivity of oxygen chelated ruthenium carbene metathesis catalysts
Zhang, Yiran,Shao, Mingbo,Zhang, Huizhu,Li, Yuqing,Liu, Dongyu,Cheng, Yu,Liu, Guiyan,Wang, Jianhui
, p. 1 - 9 (2014/03/21)
The rate of initiation of Hoveyda catalysts is affected by the electronic and steric effects that act upon the Rua?O coordination. In order to boost the activity of Hoveyda catalysts, a series of new oxygen chelated ruthenium carbene metathesis catalysts containing an N-heterocyclic carbene (NHC) and a carbonyl group has been developed, and their catalytic activities for olefin metathesis reactions were investigated. The aliphatic end groups of complexes (H2IMes)(Cl)2RuC(H)[(C6H 3X)OCH(Me)(C(O)OEt)(X = H, OMe, Me, NO2)] were functionalized by the attachment of a straight-chain ester. The X-ray structures of complex (H2IMes)(Cl)2RuC(H)[(C6H 4)OCH(Me)(C(O)NMe2)] showed that the carbonyl oxygen of the amide and the terminal oxygen of the benzylidene ether are both coordinated to the metal to give an octahedral structure. However, the carbonyl oxygen of complexes (H2IMes)(Cl)2RuC(H)[(C6H 3X)OCH(CH2C(O)OCH2)(X = H, OMe)] does not coordinate to the metal due to the steric effect of the lactone. All these complexes were used as catalysts for olefin metathesis reactions and all exhibited excellent performances for the ring-closing metathesis (RCM) of diethyl diallymalonate at 30 C. The initiation rate of these catalysts was higher than that for the Hoveyda catalyst ((H2IMes)(Cl) 2RuC(H)(C6H4-2-OiPr)) and these complexes are also active for cross metathesis (CM).
A unique ruthenium carbyne complex: A highly thermo-endurable catalyst for olefin metathesis
Wang, Jianhui,Shao, Mingbo,Zheng, Lu,Qiao, Weixia,Wang, Jingjing
supporting information, p. 2743 - 2750,8 (2012/12/12)
A cationic ruthenium carbyne complex was prepared and was found to initiate olefin metathesis reactions with good activities, which throws a new light on the design of a new type of ruthenium catalyst for RCM reactions. More importantly, no double bond isomerized by-product was observed even at elevated temperatures in reactions catalyzed by the new carbyne complex. A mechanism involving the in situ conversion of the ruthenium carbyne to a ruthenium carbene complex via addition of an iodide to the carbyne carbon was also proposed.
