Isolation and characterization of an iodide bridged dimeric palladium complex in carbonylation of methanol

Iodide bridged palladium dimeric complex, [PPh3CH3]2[Pd2I6] was isolated from the reaction mixtures of carbonylation of methanol using Pd(OAc)2-HI-PPh3 catalyst system and characterized using NMR and X-ray crystallography. Reaction mechanism was proposed based on UV and IR spectroscopic characterizations.