Process for preparing transition metal complexes containing disubstituted cyclopentadienyl ligands
AssigneeWitco Corporation
InventorRichard Lisowsky
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Abstract
A process for preparing transition metal complexes containing disubstituted cyclopentadienyl ligands of the general formula (1) ##STR1## in which a monomeric, monosubstituted cyclopentadiene is reacted using a mixture of an alkali metal oxide or hydroxide and an alkaline earth metal oxide or hydroxide as a metallating agent in polyoxyalkylene polyethers as the reaction medium with organic halides or pseudohalides to give the intermediate disubstituted cyclopentadiene which is, in situ, metallated and reacted with a transition metal halide to give the end product.
Claims12
A process for preparing a transition metal complex containing disubstituted cyclopentadienyl ligands of the general formula (1) ##STR5## wherein R and R.sup.1 are the same or different and each is a C.sub.1 -C.sub.30 -alkyl group, C.sub.2 -C.sub.30 -alkenyl group, C.sub.7 -C.sub.30 -alkyl-aryl group, C.sub.8 -C.sub.30 -alkenylaryl group, C.sub.3 -C.sub.12 -alkoxyalkyl group, C.sub.1 -C.sub.30 -fluoroalkyl group or C.sub.1 -C.sub.6 -alkyl-tri(C.sub.1 -C.sub.10 -alkyl)silyl;
- M" is a transition metal from Group IIIB, IVB, VB, VIB or VIII of the Periodic Table of Elements;
- X' is Cl, Br or I;
- n is the oxidation state of the transition metal M";
- a is .ltoreq.n;
- and a is equal to the number of groups X' on the transition metal to be replaced, wherein said process comprises:
- (a) reacting a monomeric monosubstituted cyclopentadiene of the formula R--C.sub.5 H.sub.9, a first metallating agent and an organic halide R.sup.1 -X wherein X denotes a halide, in a polyoxyalkylene polyether reaction medium to produce an intermediate disubstituted cyclopentadiene, wherein said metallating agent is a mixture of one or more alkali metal compounds selected from the group consisting of alkali metal oxides and alkali metal hydroxides and one or more alkaline earth metal compounds selected from the group consisting of alkaline earth metal oxides and alkaline earth metal hydroxides;
- and
- (b) metallating said intermediate disubstituted cyclopentadiene produced in step (a) with a second metallating agent selected from the group consisting of Li, Na, K, NaH, KH and lithium alkyls to produce a metallated product;
- and
- (c) reacting said metallated product from step (b) with a transition metal compound containing a metal from Group IIIB, IVB, VB, VIB or VIII of the Periodic Table of Elements to produce a transition metal complex of formula (1).
Dependencies are inferred from the claim text.