Patent ID: 7223878
Filing Date: 2007-05-29
Classification: C07F,Y10S

Abstract:
1. 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 R R l is 4, m is 4, L o is an integer from 1 to 4, Z is a bridging structural element between the two cyclopentadienyl rings and v is 1.