Metal complexes with an adamantane-like structure

Details Metal complexes with an adamantane-like structure Metal complexes with an adamantane-like structure

1999-04-14

2000-06-20

Nazario-Gonzalez, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 43, 556 52, 556 54, 556 56, 556 57, 556 58, 502103, 502117, 526160, C07F 700, C07F 900, C07F 1100

Patent

active

060779659

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to metal complexes of the formula I ##STR2## where the substituents have the following meanings: M is a metal of transition group III, IV, V or VI of the Periodic Table of the Elements or a metal of the lanthanide series, or VI of the Periodic Table of the Elements, C.sub.1 -C.sub.10 -alkoxy, C.sub.1 -C.sub.10 -alkylthio or dialkylamido having from 1 to 4 carbon atoms in each alkyl radical, is 0, 1 or 2 and 40 the valence of M is 2+n.
The present invention further relates to a process for preparing such metal complexes and to their use as constituents of a catalyst system for polymerizing olefinically unsaturated compounds.
Metallocene complexes are known as constituents of catalyst complexes for polymerizing olefinically unsaturated compounds. For example, WO 95/06071 describes heterofunctional compounds containing cyclopentadienyl radicals. However, this class of compounds is not able to effectively suppress chain transfer by .beta.-hydride elimination, which leads to premature stopping of the polymerization and thereby to limited molecular weights.
DE-A 44 20 783 discloses heterofunctional, cyclopentadienyl-free compounds which, however, have an open catalyst structure and are therefore not stereoselective or favor chain transfer by .beta.-hydrogen elimination.
It is an object of the present invention to provide novel metal complexes which can be used as constituents of catalyst systems for polymerizing olefinically unsaturated compounds and in the process effectively suppress .beta.-hydrogen elimination and are stereoselective. In addition, the novel metal complexes should be simple to prepare.
We have found that this object is achieved by the metal complexes defined at the outset.
We have also found a process for preparing such metal complexes and also their use as constituents of a catalyst system for polymerizing olefinically unsaturated compounds.
Among the metal complexes of the formula I, preference is given to those in which the substituents have the following meanings: Elements, preferably a metal of transition group IV, i.e. titanium, zirconium or hafnium, in particular titanium, C.sub.1 -C.sub.10 -alkoxy, dialkylamido, alkylaryl, arylalkyl, haloalkyl or haloaryl each having from 1 to carbon atoms in the alkyl radical and from 6 to 20 carbon atoms in the aryl radical, or fluorine, chlorine, bromine or iodine, preferably C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or chlorine, in particular methyl, isobutyl, methoxy, isopropoxy or chlorine, Periodic Table of the Elements, preferably N, P, O or S as anion, preferably hydrogen, methyl, ethyl, n-propyl or cyclohexyl, -C.sub.10 -cycloalkyl, C.sub.6 -C.sub.20 -aryl, alkylaryl, arylalkyl, haloalkyl or haloaryl each having from 1 to 10 carbon atoms in the alkyl radical and from 6 to 20 carbon atoms in the aryl radical, or fluorine, chlorine, bromine or iodine, or two adjacent radicals may together form a cyclic group having from 4 to 5 carbon atoms, or Si(R.sup.12).sub.3 where C.sub.6 -C.sub.15 -aryl, and in particular
Examples of particularly preferred metal complexes of the formula I are: diisopropoxide diisopropoxide diisopropoxide
The metal complexes 1,3-dimethylamido-5,5-dimethylcyclohexanetitanium dichloride, 1,3-dimethylamido-5,5-dimethylcyclohexanedimethyltitanium and 1,3-di(isopropylamido)-2,5,5-trimethylcyclohexanetitanium dichloride are particularly preferred.
The novel metal complexes of the formula I can be prepared by the following methods:
A compound of the formula II ##STR3## is metallated.
This is preferably done by reacting a compound of the formula II with hydrides, carboorganic compounds, nitrogenorganic compounds or organosilicon compounds of alkali metals or alkaline earth metals and then treating the product with halogen, alkoxy or aryloxy compounds of M.
Compounds of the formula II can be prepared as follows:
A compound of the formula V ##STR4## where R.sup.13 and R.sup.14 are .dbd.O, .dbd.S or .dbd.NR.sup.15 where R.sup.15 is hydrogen, C.sub.1 -C.sub.10 -alkyl or C.sub.4 -C.sub.6 -cycloalkyl

REFERENCES:
patent: 5707913 (1998-01-01), Schlund et al.
Chem. Abst, Inorg. Chem. Acta, Bd. 212, N4. 1-2, S. 281-288 (1994).

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