(Pyrazol-1-ylmethyl)pyridine palladium complexes: Synthesis, molecular structures, and activation of small molecules

Pyrazol-1-yl)pyridine forms both dichloro and chloromethyl palladium complexes. Removal of chloride from the chloromethyl complexes forms cationic species that polymerize ethylene. The neutral chloromethyl palladium complexes readily react with sulfur dioxide and carbon monoxide, leading to insertion of these molecules in the palladium-carbon bond of the chloromethyl palladium complexes.