Synthesis, characterization and a reactivity study of some allyl palladium complexes bearing bidentate hemi-labile carbene or mixed carbene/PPh3 ligands

Some novel palladium allyl and 2-Meallyl complexes bearing hemilabile spectator ligands containing a pivoting carbene and a labile wing with pyridine nitrogen or thioetheric sulfur as coordinating atom or PPh3 and again a carbene moiety have been synthesized and characterized . The solid state structures of two complexes and the mechanism of the reaction of amination of the allyl coordinated to two selected complexes have been also determined. The proposed mechanism suggests that the attack of the amine occurs trans to the carbene carbon irrespective of the hindrance by the substituent of the labile atom which however can heavily depress the reaction rate.