S. P. Smidt, A. Pfaltz, Eloísa Martínez-Viviente
Feb 5, 2003
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Quality indicators
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Organometallics
Abstract
Two trinuclear iridium hydride clusters of the type [Ir3(μ3-H)(H)6(PHOX)3]X1X2 (X1 = PF6, X2 = OTf; X1 = X2 = PF6; X1 = X2 = OTf; PHOX = (S)-4-tert-butyl-2-[2-(di-o-tolylphosphinyl)phenyl]-4,5-dihydrooxazole, (S)-2-[2-(diphenylphosphinyl)phenyl]-4-isopropyl-4,5-dihydrooxazole) have been prepared and characterized by X-ray diffraction and multidimensional NMR. They contain a single bridging hydride in pseudo-trans position to the P-donors. The complexed PHOX ligands reveal a chiral pocket involving one pseudoequatorial P-aryl substituent and one pseudoaxial (proximate to the oxazoline substituent) P-aryl group. These trinuclear complexes are shown to be inactive as hydrogenation catalysts.