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首页> 外文期刊>Chemistry: A European journal >Linker-free, silica-bound olefin-metathesis catalysts: Applications in heterogeneous catalysis
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Linker-free, silica-bound olefin-metathesis catalysts: Applications in heterogeneous catalysis

机译：无接头，与二氧化硅结合的烯烃复分解催化剂：在非均相催化中的应用

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摘要

A set of heterogenized olefin-metathesis catalysts, which consisted of Ru complexes with the H_2ITap ligand (1,3-bis(2',6'-dimethyl-4'dimethyl aminophenyl)-4,5-dihydroimidazol-2-ylidene) that had been adsorbed onto a silica support, has been prepared. These complexes showed strong binding to the solid support without the need for tethering groups on the complex or functionalized silica. The catalysts were tested in the ring-opening-ring-closing-metathesis (RO-RCM) of cyclooctene (COE) and the self-metathesis of methyl oleate under continuous-flow conditions. The best complexes showed a TON>4000, which surpasses the previously reported materials that were either based on the Grubbs-Hoveyda II complex on silica or on the classical heterogeneous Re_2O_7/B_2O_3 catalyst. Born free: Silica adsorption of ruthenium carbenes with the H_2ITap ligand (see figure) yielded heterogeneous materials without the need for tethering groups on the complex or the support. These materials were tested as catalysts in the ring-opening-ring-closing-metathesis of cyclooctene and the cross-metathesis of methyl oleate under continuous-flow conditions. The best complexes showed a TON>4000, which surpasses the most active silica-based materials.
机译：一套异质烯烃复分解催化剂，由具有H_2ITap配体（1,3-双（2'，6'-二甲基-4'二甲基氨基苯基）-4,5-二氢咪唑-2-亚基）的Ru配合物组成已经被吸附到二氧化硅载体上。这些络合物显示出与固相载体的牢固结合，而无需络合物或功能化二氧化硅上的束缚基团。在连续流动条件下，在环辛烯（COE）的开环-开环-复分解（RO-RCM）和油酸甲酯的自复分解中对催化剂进行了测试。最佳配合物的TON> 4000，超过了先前报道的基于二氧化硅上的Grubbs-Hoveyda II配合物或经典的非均相Re_2O_7 / B_2O_3催化剂的材料。无内生：用H_2ITap配体（见图）进行二氧化硅吸附钌卡宾烯可得到异质材料，而无需在配合物或载体上形成束缚基团。在连续流动条件下，在环辛烯的开环-开环-复分解反应和油酸甲酯的交叉复分解反应中，将这些材料作为催化剂进行了测试。最好的配合物显示TON> 4000，超过了最具活性的二氧化硅基材料。

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