Dalton Transactions p. 11150 - 11156 (2020)
Update date:2022-08-17
Topics:
Bryliakov, Konstantin P.
Lubov, Dmitry P.
Lyakin, Oleg Yu.
Rybalova, Tatyana V.
Samsonenko, Denis G.
Talsi, Evgenii P.
Four palladium(ii) complexes with tripodal ligands of the tpa family (tpa = tris(2-pyridylmethyl)amine) have been synthesized and X-ray characterized. These complexes efficiently catalyze benzylic C-H oxidation of various substrates with peracetic acid, affording the corresponding ketones in high yields (up to 100%), at <1 mol% catalyst loadings. Complex [(tpa)Pd(OAc)](PF6) with the least sterically demanding ligand tpa demonstrates the highest substrate conversions and ketone selectivities. Preliminary mechanistic data provide evidence in favor of metal complex-mediated rate-limiting benzylic C-H bond cleavage by an electron-deficient oxidant.
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