Patent ID: 7223878

Claim:
A process for separating inorganic and organometallic by-products from a mixture comprising at least one organometallic transition metal compound as product and at least one organometallic by-product and at least one inorganic by-product as by-products, which comprises the steps A) admixing the mixture comprising the product, the organometallic by-product and the inorganic by-product with a mixture comprising at least one polar organic extractant and water, wherein the molar ratio of the polar organic extractant to water is from 10:1 to 1:10, and separating off the undissolved residue, B) washing the residue from step A) with a nonpolar organic extractant or a mixture comprising at least one nonpolar organic extractant and at least one aprotic polar organic solvent and C) drying the residue which has been washed in step B) and comprises the organo-metallic transition metal compound, wherein the organometallic transition metal compound is a compound of the formula (II) in racemic form where M 4 is a metal of groups 3, 4, 5 or 6 of the Periodic Table of Element, R 15 are identical or different and are each a hydrogen atom or Si(R 17 ) 3 , where R 17 are identical or different and are each a hydrogen atom of a C 1 –C 40 group, or R 15 is a C 1 –C 30 group, or two or more radicals R 15 may be jointed to one another so that the radicals R 15 and the atoms of the cyclopentadienyl ring which connect them form a C 4 –C 24 ring system which may in turn be substituted, R 16 are identical or different and are each a hydrogen atom or a Si(R 18 ) 3 R 18 are identical or different and are each a hydrogen atom or a C 1 –C 40 group, or R 16 is a C 1 –C 30 group, or two or more radicals R 16 may be joined to one another so that the radicals R 16 and the atoms of the cyclopentadienyl ring which connect them form a C 4 –C 24 ring system which may in turn be substituted, l is 4, m is 4, L 1 are identical or different and are each a hydrogen atom, a C 1 –C 10 -hydrocarbon group, a halogen atom, OR 19 , SR 19 , OSi(R 19 ) 3 , Si(R 19 ) 3 , P(R 19 ) 2 or N(R 19 ) 2 where R 19 is a C 1 –C 10 -alkyl group, a halogenated C 1 –C 10 -alkyl group, a C 6 –C 20 -aryl group, a C 7 –C 20 -alkylaryl group or a halogenated C 6 –C 20 -aryl group, or L 1 is a toluenesulfonyl, trifluoroacetyl, trifluoroacetoxyl, trifluoromethane-sulfonyl, nonafluorobutanesulfonyl or 2,2,2-trifluoroethanesulfonyl group, o is an integer from 1 to 4, Z is a bridging structural element between the two cyclopentadienyl rings and v is 1.