Polymers of ferrocene
AssigneeThe Dow Chemical Company
InventorsJere D. Fellmann, Philip E. Garrou, Howard P. Withers, Jr., Dietmar Seyferth
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Abstract
Novel linear polymers of ferrocene are prepared by the reaction of 1,1'-dilithioferrocene with controlled amounts of a dihaloorganylphosphine, arsine or stibine. The polymers form stable complexes with Group VIII metals which are useful as recoverable hydroformylation catalysts.
Claims8
A linear polymer of ferrocene substantially free from heteroannular moieties having an absolute molecular weight from about 8.000 to about 160,000 amu having the formula:
- ##STR4## where R is a hydrocarbyl or an oxy containing hydrocarbyl radical of up to about 10 carbons selected from the group consisting of alkyl, aryl, alkaryl, aralkyl, alkenyl, aralkenyl, alkoxy, aryloxy and alkoxyaryl radicals;
- Y is triavalent phosphorus, arsenic or antimony;
- X is halo, hydroxy, R, or an ester group of up to about 10 carbons;
- Z is lithium, hydrogen or a group of the formula Y(R).sub.2 where Y and R are as previously defined;
- and n is an integer greater than 2.
A process for producing linear polymers of ferrocene corresponding to the formula ##STR5## where R is a hydrocarbyl or hydrocarboxyl radical of up to about 10 carbons selected from the group consisting of alkyl, aryl, alkaryl, aralkyl, alkenyl, aralkenyl, alkoxy, aryloxy and alkoxyaryl radicals;
- Y is trivalent phosphorus, arsenic or antimony;
- X is halo;
- and n is an integer greater than 2, comprising reacting 1,1'-dilithioferrocene with a reactive compound of formula X.sub.2 YR where X, Y and R are as previously defined, by controllably adding the reactive compound to the 1,1'-dilithioferrocene at a rate such that formation of dimer by-products is substantially avoided.
Dependencies are inferred from the claim text.