Selective C–H activation of
benzene and n-octane under mild conditions by a pincer
IrIII carboxylate
complex, (CCCMesityl)Ir(OAc)2(OH2) (1a), is described. A kinetic study of benzene activation
was undertaken, and the resulting Eyring analysis informed the design
of a
tButylCCCMethyl-ligated
IrIII carboxylate, which exhibited a ΔG
⧧ value for the reaction lower than that observed
for 1a. Elimination of the aquo ligand was found to further
lower the ΔG
⧧ value of benzene
activation, enabling C–H activation by IrIII at
temperatures as low as 30 °C.
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