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首页> 外文期刊>Catalysis science & technology >Ligand effects in rhodium-catalyzed hydroformylation with bisphosphines: steric or electronic?
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Ligand effects in rhodium-catalyzed hydroformylation with bisphosphines: steric or electronic?

机译：配体影响rhodium-catalyzed加氢甲酰化bisphosphines:空间电子吗?

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摘要

Twelve commercially available bisphosphine ligands have been evaluated in rhodium-catalyzed hydroformylation reactions. All ligands exhibited high chemoselectivities for aldehyde formation. The highest enantioselectivity (53% ee) of styrene hydroformylation was achieved with (S)-BTFM-Garphos (L7) substituted with electron withdrawing substituents. High pressure NMR (HP-NMR) spectroscopy and in situ high pressure IR spectroscopy (HP-IR) were used to study the resting states of the catalyst species in the reactions. The ligand effect on the structures of the observable species was examined. Both electronic and steric factors were considered to contribute to the performance of the various ligands. The results showed that decreasing the phosphine basicity increased the enantioselectivity, while in the systems studied here the steric character plays a less important role than the electronic features in achieving good regioselectivities.
机译：十二个商用bisphosphine配体一直在评估rhodium-catalyzed吗加氢甲酰化反应。高chemoselectivities醛的形成。最高的选择性(ee) 53%苯加氢甲酰化实现(S) -BTFM-Garphos(地级)代替电子取代基撤出。(HP-NMR)原位光谱和高压力红外光谱(HP-IR)被用来研究静息状态的催化剂种类反应。可观察到的物种被检查。电子和立体因素被认为导致不同的性能配体。磷化氢碱度增加了构型,在系统研究这里的空间角色扮演了一个不那么重要了在实现的作用比电子特性良好的区域选择性。

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