Regeneration of an Iridium(III) Complex Active for
Alkane Dehydrogenation Using Molecular Oxygen
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Abstract
(<sup><i>dm</i></sup>Phebox)Ir(OAc)<sub>2</sub>(OH<sub>2</sub>) (<b>1a</b>) has previously been found to promote stoichiometric
alkane dehydrogenation, affording alkene, acetic acid, and the corresponding
Ir hydride complex (<sup><i>dm</i></sup>Phebox)Ir(OAc)(H)
(<b>2a</b>) in high yield. In this study, we describe the use
of oxygen to quantitatively regenerate <b>1a</b> from <b>2a</b> and HOAc. Distinct reaction intermediates are observed
during the conversion of <b>2a</b> to <b>1a</b>, depending
upon the presence or absence of 1 equiv of acetic acid, highlighting
potential mechanistic implications regarding alkane dehydrogenation
catalysis and the use of oxygen as an oxidant in such systems
