Hydrogenation of unsaturated polymers using divalent diene-containing bis-cyclopentadienyl group IV metal catalysts
AssigneeThe Dow Chemical Company
InventorsDavid D. Devore, James C. Stevens, Stephen F. Hahn, Francis J. Timmers, David R. Wilson
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Abstract
Organic compounds are hydrogenated in the presence of certain bis(pentadienyl) divalent Group IV metal complexes having π-bound, neutral, conjugated diene ligands. These complexes are effective hydrogenation catalysts for polymers containing ethylenic unsaturation. They further provide for selective hydrogenation of ethylenic unsaturation sites in the presence of aromatic groups.
Claims35
A process for selectively hydrogenating a polymer, copolymer or mixture thereof containing olefinic unsaturation comprising (a) contacting the polymer, copolymer or mixture with a hydrogenating agent in the presence of a catalytic amount of a divalent Group IV metal compound, which is represented by the structure:
- CpCp′M•D (Formula 1)
- wherein M is titanium, zirconium or hafnium, Cp and Cp′ are each substituted or unsubstituted cyclopentadienyl ligands, which are optionally the same or different from each other, and D represents a conjugated, neutral diene, which is coordinated via π complexation to the M atom.
Dependencies are inferred from the claim text.