Category: chiral-nitrogen-ligands. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Tri(naphthalen-1-yl)phosphine, is researched, Molecular C30H21P, CAS is 3411-48-1, about Hydrogen transfer. XXVII. Influence of ligands in tertiary phosphines on the rate of hydrogenation of olefines with rhodium complexes in homogenous solution.
The rate of homogeneous hydrogenation r of 1-hexene in the presence of various tertiary phosphine-RhCl complexes as catalysts is determined at 25-30° and discussed in relation to the substituents in the phosphines. The phosphine-Rh(I) complexes are prepared from μ-dichlorobis(1,5-hexadiene)dirhodium(I) and tertiary phosphines under H. Maximum r-values are observed for 1:2.2 Rh-phosphine molar ratio. Para substituents with donor quality in PPh3 increase r, but electrophilic substituents in the same position decrease r. Aliphatic ligands in the tertiary phosphines decrease r; an increase of r is only observed for bulk ligands, e.g., in the case of MePPhBu-tert.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis