✍ Scribed by Zheng Huang; Maurice Brookhart; Alan S. Goldman; Sabuj Kundu; Amlan Ray; Susannah L. Scott; Brian C. Vicente
No coin nor oath required. For personal study only.
Pincer‐ligated iridium complexes have proven to be highly effective catalysts for the dehydrogenation and transfer‐dehydrogenation of alkanes. Immobilization onto a solid support offers significant potential advantages in the application of such catalysts particularly with respect to catalyst separation and recycling. We describe three approaches toward such immobilization: (i) covalent attachment to a Merrifield resin, (ii) covalent bonding to silica via a pendant alkoxysilane group, and (iii) adsorption on γ‐alumina (γ‐Al~2~O~3~), through basic functional groups on the __para‐__position of the pincer ligand. The simplest of these approaches, adsorption on γ‐Al~2~O~3~, is also found to be the most effective, yielding catalysts that are robust, recyclable, and comparable to or even more active than the corresponding species in solution. Spectroscopic evidence (NMR, IR) and studies of catalytic activity support the hypothesis that binding occurs at the __para‐__substituent and that this has only a relatively subtle and indirect influence on catalytic behavior.
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