UV-light promoted C-H bond activation of benzene and fluorobenzenes by an iridium(i) pincer complex.

Iridium(i) carbonyl complex [Ir(2,6-(PtBu2CH2)2C6H3)(CO)] undergoes reversible C-H bond activation of benzene and a series of fluorobenzenes on UV irradiation. Exclusive ortho-selectivity is observed in reactions of fluorobenzene and 1,2-difluorobenzene.

C-F bond activation of perfluorinated arenes by a bioxazoline-derived N-heterocyclic carbene.

The N-heterocyclic carbene IBioxMe4 enacts selective single and double C-F bond activation of octafluorotoluene and hexafluorobenzene, respectively. The formation of the fluoroarene substituted, zwitterionic imidazoliumolate products is consistent with a mechanism involving nucleophilic aromatic substitution and subsequent oxazoline ring opening by liberated fluoride.

Immobilisation of a molecular epoxidation catalyst on UiO-66 and -67: the effect of pore size on catalyst activity and recycling.

Amino-functionalised metal-organic frameworks UiO-66 and -67 were post-synthetically modified with salicylaldehyde. A molybdenum complex was immobilised on the resulting materials. They were characterised by (13)C-MAS-NMR, XPS and PXRD to confirm immobilisation and stability. The immobilised complex is an active and reusable catalyst for olefin epoxidation with tert-butyl hydroperoxide (TBHP) as an oxidant. It is shown that the effective pore size, probed with Brunauer-Emmett-Teller (BET) surface area analysis and the number of amino groups affect the diffusion of reactants and products, as well as catalyst recycling.

Low-coordinate iridium NHC complexes derived from selective and reversible C-H bond activation of fluoroarenes.

Interaction of the reactive 14 VE {Ir(IBioxMe4)3}(+) fragment with fluoroarenes results exclusively in ortho-C-H bond oxidative addition and formation of 16 VE Ir(iii) derivatives [Ir(IBioxMe4)3(Ar)H](+) (Ar = 2-C6H4F, 2,3-C6H3F2, 2,4,6-C6H2F3). The C-H bond activation reactions occur under mild conditions and are reversible.