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Issue 16, 2011
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Reactions of phosphinites with oxide surfaces: a new method for anchoring organic and organometallic complexes

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Abstract

When a pincer-ligated iridium complex with a phosphinite substituent in the para-position of the aromatic backbone is immobilized on γ-alumina, it becomes a highly effective supported catalyst for the transfer-dehydrogenation of alkanes. The nature of the interaction between the organometallic complex and the support was investigated using solid-state 31P MAS NMR spectroscopy, solution-state 1H and 31P{1H} NMR spectroscopy, IR and GC/MS analysis of extracted reaction products. The phosphinite substituent is cleaved from the pincer ligand by its reaction with hydroxyl groups on the γ-alumina surface, resulting in covalent anchoring of the complex via the aryl ring. A similar reaction occurs on silica, allowing for ready grafting onto this support as well. A strategy for anchoring homogeneous catalysts on hydroxyl-terminated oxide supports though the selective cleavage of [POR]-containing ligand substituents is suggested.

Graphical abstract: Reactions of phosphinites with oxide surfaces: a new method for anchoring organic and organometallic complexes

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Publication details

The article was received on 11 Oct 2010, accepted on 03 Feb 2011 and first published on 08 Mar 2011


Article type: Paper
DOI: 10.1039/C0DT01369B
Citation: Dalton Trans., 2011,40, 4268-4274
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    Reactions of phosphinites with oxide surfaces: a new method for anchoring organic and organometallic complexes

    B. C. Vicente, Z. Huang, M. Brookhart, A. S. Goldman and S. L. Scott, Dalton Trans., 2011, 40, 4268
    DOI: 10.1039/C0DT01369B

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