Method for producing octahydrofluorenyl metal complexes
AssigneeThe Dow Chemical Company
InventorsThomas H. Newman, Jerzy Klosin, Peter N. Nickias
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Abstract
Octahydrofluorenyl metal complexes, such as octahydrofluorenyltitanium trichloride, or ring substituted octahydrofluorenyl metal complexes wherein the metal is in the +2, +3 or +4 formal oxidation state are prepared by reduction of tetra- or hexa-hydrofluorenyl metal complexes. The reduction reaction may be carried out at ambient pressure and temperature in the presence of a catalyst. The process of the present invention permits preparation of octahydrofluorenyltitanium metal complexes from a series of high yield reactions starting with fluorene.
Claims18
A process for producing octahydrofluorenyl metal complexes corresponding to the formula:
- E.sub.n MX.sub.p X'.sub.q
- wherein:
- E is an octahydrofluorenyl group or an octahydrofluorenyl group substituted with from 1 to 15 hydrocarbyl groups, each such hydrocarbyl group having 1 to 10 carbon atoms;
- n is 1 or 2;
- M is titanium, zirconium or hafnium in the +2, +3 or +4 formal oxidation state;
- X is independently in each occurrence an anionic ligand group having up to 40 atoms;
- p is 0, 1, 2 or 3, and n+p equals the formal oxidation state of M;
- X' is an inert, neutral donor ligand;
- and
- q is 0, 1, or 2;
- the process comprising the step of contacting a fiuorenyl metal complex with hydrogen gas, the fluorenyl metal complex corresponding to the formula:
- A.sub.n MX.sub.p X'.sub.q
- wherein A is a tetrahydrofluorenyl group, a tetrahydrofluorenyl group substituted with from 1 to 13 hydrocarbyl groups, a hexahydrofluorenyl group, or a hexahydrofluorenyl group substituted with from 1 to 15 hydrocarbyl groups, each such hydrocarbyl group having 1 to 10 carbon atoms.
Dependencies are inferred from the claim text.