This reagent allows for control of tacticity, and comes in multiple "generations.
Ball milling with magnesium chloride in the presence of ethyl benzoate is part of the Chien-Wu-Kuo method for synthesis of this reagent, and the Patat-Sinn mechanism describes it partially bonding reactants between two metal atoms. Octahedral coordinative vacancies on its surface are formed by chlorine ligands and an alkyl group in the Cossee-Arlman mechanism. This reagent allows for control of tacticity, and comes in multiple "generations." The reaction series it catalyzes typically ends in beta-H and beta-methyl elimination. For 10 points, name this type of catalyst important in olefin metathesis and polymer synthesis, which usually contains aluminum or titanium and is named for German and Italian chemists.
Ball milling with magnesium chloride in the presence of ethyl benzoate is part of the Chien-Wu-Kuo method for synthesis of this reagent, and the Patat-Sinn mechanism describes it partially bonding reactants between two metal atoms.
Ziegler-Natta catalyst or reagent