Dialing in single-site reactivity of a supported calixarene-protected tetrairidium cluster catalyst.

ABSTRACT: A closed Ir₄ carbonyl cluster, 1, comprising a tetrahedral metal frame and three sterically bulky tert-butyl-calix[4]arene(OPr)₃(OCH₂PPh₂) (Ph = phenyl; Pr = propyl) ligands at the basal plane, was characterized with variable-temperature ¹³C NMR spectroscopy, which show the absence of scrambling of the CO ligands at temperatures up to 313 K. This demonstration of distinct sites for the CO ligands was found to extend to the reactivity and catalytic properties, as shown by selective decarbonylation in a reaction with trimethylamine N-oxide (TMAO) as an oxidant, which, reacting in the presence of ethylene, leads to the selective bonding of an ethyl ligand at the apical Ir site. These clusters were supported intact on porous

SUBMITTER: Palermo A 

PROVIDER: S-EPMC5607854 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature