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Tuning the sterics: Rh-catalyzed hydroformylation reactions with ferrocene based diphosphorus ligands
Journal of Catalysis ( IF 6.5 ) Pub Date : 2024-12-02 , DOI: 10.1016/j.jcat.2024.115871
Subhayan Dey, Lea Dettling, Dalma Gál, Clemens Bruhn, Zsolt Kelemen, Christian Müller, Rudolf Pietschnig

The mono- and bidentate ligands FcPPh2 (1), FcPtBu2 (2), FcPMes2 (3), Fc’(PPh2)2 (dppf), Fc’(PMes2)2 (4), Fc’(PMes2)(PPh2) (5), and Fc’(PMes2)(PtBu2) (6) (Fc and Fc’ stand for 1- and 1,1′-substituted ferrocene, respectively) were reacted with Rh(I)-precursors. Maintaining P:Rh stoichiometric ratios of 2:1, dimeric Vaska-type complexes featuring P-Rh-P bridges (715), and monomeric complexes with [Rh(CO)2(acac)] moieties (1622) were obtained. Complexes 1622 were further applied in the Rh-catalyzed hydroformylation of 1-octene, while the linear-to-branched ratio (l/b) of the formed aldehydes decreases with the increase of steric bulk at the P atoms, which was further verified by theoretical calculations. For ligands 35, activation of the C–H bonds of the o-CH3 units of the mesityl substituent occurred with Rh(I), forming complexes with rare five-membered [C3PRh(III)] rings (10, 18a, 20 and 21a). Complexes 8, 10, 11, 13, 15 and 17 were unambiguously characterized by means of single crystal X-ray diffraction.

中文翻译:


调整空间位控:Rh 催化的加氢甲酰化反应与基于二茂铁的二磷配体



单齿和双齿配体 FcPPh2 (1)、FcPtBu2 (2)、FcPMes2 (3)、Fc'(PPh2)2 (dppf)、Fc'(PMes2)2 (4)、Fc'(PMes2)(PPh2) (5) 和 Fc'(PMes2)(PtBu2) (6) (Fc 和 Fc' 分别代表 1 和 1,1′ 取代的二茂铁)与 Rh(I) 前驱体反应。保持 P:Rh 化学计量比为 2:1,获得了具有 P-Rh-P 桥 (7-15) 的二聚体 Vaska 型复合物和具有 [Rh(CO)2(acac)] 部分 (16-22) 的单体复合物。配合物 16-22 进一步应用于 Rh 催化的 1-辛烯加氢甲酰化反应,而形成的醛的线性支链比 (l/b) 随着 P 原子空间体积的增加而降低,这通过理论计算进一步验证了。对于配体 3-5,均等取代基的 o-CH3 单元的 C-H 键与 Rh(I) 一起发生激活,形成具有罕见的五元 [C3PRh(III)] 环(10、18a、20 和 21a)的复合物。配合物 8、10、11、13、15 和 17 通过单晶 X 射线衍射进行了明确的表征。
更新日期:2024-12-02
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