A New Cyclometalation Motif:  Synthesis, Structure, and Reactivity of Palladacycles That Contain a Chiral Rhenium Fragment in the Backbone and Are Catalyst Precursors for Heck Reactions

Abstract

Reactions of ( R )-[(η 5 -C 5 H 5 )Re(NO)(PPh 3 )(CH 2 PPh 2 H)] + X -, mild base, and Pd(OAc) 2 yield the novel Pd 3 (OAc) 4 -based palladacycle which has been characterized crystallographically and elaborated to dimeric halide-bridged and monomeric palladacycles that are effective catalyst precursors for the Heck reaction.