The Dow Chemical Company

University of California

Mark S Delaney

Richard E Campbell, Jr

William Monroe Coleman, Iii

Marion Frederick Hawthorne

James L Brewbaker

Gregory F Schmidt

William B Marshall

A complex of an alkyllithium compound and 1,2-dipyrrolidinoethane is useful as an initiator for the polymerization of ethylene and ethylene block copolymers.

Initiator and method for polymerizing ethylene and preparing block

Catalyst compositions are disclosed which are a combination of a supported titanium compound such as titanium tetraisopropoxide supported on magnesium dichloride and at least one other supported metallic catalyst such as dicyclopentadienyl zirconium dichloride supported on alumina and a cocatalyst such as aluminoxane. These catalysts are useful in the polymerization of .alpha.-olefins.

Heterogeneous organometallic catalysts containing a supported titanium

An extraordinarily active carborane catalyst for use in hydrogenation, hydroformulation and isomerization reactions. The new catalyst is a modification of known metallocarborane catalysts having a transition metal symmetrically bonded to the pentagonal face of a dicarborane cage with two triphenylphosphine ligands and one hydrogen ligand occupying the remaining transition metal ligand sites. The new alkene-metallocarborane replaces one of the triphenylphosphine ligands with a lower chelating or bridging alkene which is bound to both the transition metal and the carborane cage. The alkene-metallocarborane catalyst may be used as a homogenous catalyst or may be bound to a suitable polymer support for use as a heterogeneous catalyst. The catalyst has been found to be among the most highly reactive catalysts known to date. It is believed the high reactivity of the new catalyst is due to the in situ irreversible hydrogenation of the alkene side chain to produce an open coordination site on the transition metal atom.

Metallocarborane precursor and catalyst

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Midland, MI, United States of America

Mark S Delaney