A method for the separation of cyclopentadienyl - or benzene - pi - complexes of transition metals by means of their adducts with thiourea

摘要

Cyclopenteadienyl- or benzene-pi-complexes of transition metals, having general formula LML' (I) (where L is an unsubstd. cyclopentadienyl- or an unsubstd. benzene ring, L' is an unsubstd. cyclopentadienyl-, an unsubstd. benzene ring or carbonyl gps. and M is a transition metal) are separated from their mixtures with cpds. (II) which do not form adducts with thiourea in the presence of an organic solvent consisting of a 1-3C alkanol and/or a dialkyl ketone; (2) separating the adducts of thiourea with (I) from (II) and (3) decomposing the adducts with release of (I). Purifying (I) for use as anti-knocking cpds., biologically active materials, stabilisers for polymers, insecticides, dyes, additives to fuels, paints, lacquers, oils and rubber and for prodn. of metallic coatings. Urea adducts of (I) may be used in improving storage stability of (I).