Synthesis, Isolation and Characterization of a Triiodo Organometallic Palladium(IV) Complex. Quantitative and Regioselective Synthesis of Two C–I Reductive Elimination Products

Abstract

Iodine and the pincer complex [Pd(O,N,C-L)I], where L is the monoanionic ligand resulting from deprotonation of the acetyl group of the dimethylmonoketal of 2,6-diacetylpyridine, are in equilibrium at low temperatures with the Pd(IV) complex [Pd(O,N,C-L)I3], which can be isolated at –40 ºC and characterized by 1H NMR spectroscopy and Xray diffraction studies, in spite of its great instability. When the same reaction is carried out at room temperature, a quantitative reductive elimination process occurs giving L–I, which in the presence of water affords L'–I, resulting from hydrolysis of L–I.