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Issue 40, 2011
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Zn(II) Robson macrocycles as templates for chelating diphosphines

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Chelating diphosphines were constructed using dinuclear Zn(II) complexes of Robson macrocycles (Zn-RMCs) as templates. The assembly process is driven by the interaction between the metal centers (Lewis acids) with anionic and neutral Lewis base-functionalized monophosphines. The stability of the final structure depends on the geometry and the affinity of the functional groups of the ditopic phosphines and on the structure of the RMC. In the free ligand the ditopic phosphines coordinate at opposite faces of the pseudo-planar macrocycle as is shown in the molecular structure of several of the assemblies, according to X-ray diffraction. Pre-organization of the system by coordinating the phosphorus atoms to a transition metal center enforced coordination of the functional groups at the same face of the RMC. For several templated diphosphines cis-PtCl2 complexes were identified by NMR. The in situ assembled diphosphines showed a chelating effect in the rhodium catalyzed hydroformylation of 1-octene. Combination of Zn-RMC 3 and phosphine A gave the highest l/b ratio (13) in acetonitrile.

Graphical abstract: Zn(ii) Robson macrocycles as templates for chelating diphosphines

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Publication details

The article was received on 13 May 2011, accepted on 22 Jul 2011 and first published on 26 Aug 2011

Article type: Paper
DOI: 10.1039/C1DT10905G
Dalton Trans., 2011,40, 10686-10697

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    Zn(II) Robson macrocycles as templates for chelating diphosphines

    S. Ponsico, H. Gulyas, M. Martínez-Belmonte, E. C. Escudero-Adán, Z. Freixa and P. W. N. M. van Leeuwen, Dalton Trans., 2011, 40, 10686
    DOI: 10.1039/C1DT10905G

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