Highly selective chromium(III) ethylene trimerization catalysts with [NON] and [NSN] heteroscorpionate ligands

Abstract

Cr(III) complexes with [NON] and [NSN] heteroscorpionate ligands derived from bis(pyrazol-l-yl)methane have been prepared, which are active for ethylene trimerization to 1-hexene with high selectivity. Structural studies have established the coordination of the ether or thioether pendant group, which leads to a bicyclic metallaheterocycle flanked by pyrazoyl rings. © 2008 American Chemical Society.