Organotransition metal compounds

A method for synthesizing a metallocene compound having the racemic structure of the general formula (II) ##STR13## wherein M.sup.1 is a group IV transition metal atom, A is a nitrogen or phosphorous atom, R.sup.1 is a aryl group, R.sup.2 is a saturated hydrocarbon group having 1-10 carbon atoms, whereby each of R.sup.2 can bind one another to constitute a ring containing A and M.sup.1, L.sup.1 and L.sup.2 can be each identical or different and are a substituted cyclopentadienyl, indenyl, substituted indenyl or substituted fluorenyl groups, B is a hydrocarbon having 1-20 carbon atoms, silylene having 1-20 carbon atoms, oligosilylene or germylene groups, binding to L.sup.1 and L.sup.2, and M.sup.1 can be also coordinated with an ether or an amine at any coordination number, by reacting

• (a) an organotransition metal compound of the general formula (I) ##STR14## wherein M.sup.1 is a group IV transition metal atom. A is a nitrogen or phosphorus atom, R.sup.1 is a aryl group, R.sup.2 is a saturated hydrocarbon group having 1-10 carbon atoms, whereby each of R.sup.2 can bind one another to constitute a ring containing A and M.sup.1, X can be identical or different and is each a halogen atom, and M.sup.1 can be also coordinated with an ether or an amine at any coordination number, provided that when R.sup.2 is a saturated hydrocarbon group having one carbon atom, and M.sup.1 is a zirconium atom whereby each of R.sup.2 binds one another to constitute a ring containing A and M.sup.1, then M.sup.1 is not coordinated with two molecules of 1,4 -dioxane;
• with
• (b) a compound of general formula (VI)
• (M.sup.2).sup.+ (L.sup.1).sup.- -B-(L.sup.2).sup.- (M.sup.2).sup.+(VI)
• wherein L.sup.1 and L.sup.2 can be each identical or different and are substituted cyclopentadienyl, indenyl, substituted indenyl or substituted fluorenyl groups, B is a hydrocarbon having 1-20 carbon atoms, silylene having 1-20 carbon atoms, oligosilylene or germylene groups, binding to L.sup.1 and L.sup.2, and M.sup.2 is an alkaline or alkaline earth metals and can be also coordinated with an ether or an amine at any coordination number.