Coordinately and electronically unsaturated organometallic complexes

Low-valent, early transition metal alkyl complexes are of fundamental importance to the study of olefin polymerization catalysis, yet such species are relatively rare. As part of our effort to model polymerization catalysts, we have prepared a series of metal alkyl complexes that have low coordination numbers and electron counts.;Dippe adducts of trivalent metals can also be prepared. Reaction of dippe with MCl;The reaction of divalent transition metal halides with the bulky chelating phosphine 1,2-bis(diisopropylphosphino)ethane, dippe, gives a series of coordinately unsaturated complexes of stoichiometry MX...