Method for producing alkyl-bridged ligand systems and transition metal compounds

A process for preparing compounds of the formula I:

• where
• M1 is Ti, Zr or Hf,
• R1 are identical or different and are each hydrogen or a C1-C20 group, and
• R2 are identical or different and are each hydrogen or a C1-C20 group, where R1 together with R2 may also form a monocyclic or polycyclic ring system, and
• R3 are identical or different and are each a hydrogen atom or a C6-C18-aryl group which may be substituted, C5-C18-heteroaryl, C7-C20-arylalkyl, C7-C20-alkylaryl, fluorinated C6-C18-aryl, fluorinated C7-C20-arylalkyl or fluorinated C7-C20-alkylaryl, and two radicals R3 and R4 may form a monocyclic or polycyclic ring system,
• R4 are identical or different and are each a hydrogen atom or together with R3 form a monocyclic or polycyclic ring system,
• R5, R6 are identical or different and are each a hydrogen atom or a C1-C20 group,
• R7, R8, R9, R10 are identical or different and are each a hydrogen atom or a C1-C20 group, and may, among one another, form a monocyclic or bicyclic ring system,
• i is from 1 to 10 and
• j is from 1 to 10 and
• X1, X2 may be identical or different and are halogen atoms, alkyl groups or substituted or unsubstituted phenoxides or X1 together with one or more radicals X1 or X2 forms a monocyclic or polycyclic ring system,
• comprising the following steps:
• A) reacting a compound of the formula II
• where
• R1, R2, R3, R4, R5 and R6 are as defined above and
• R11 is a hydrogen atom and
• R12 is hydrogen or a group which can be replaced by a metal,
• with a compound of the formula III
• M2R13 (III)
• where
• M2 is lithium and
• R13 is a hydrogen atom or a C1-C20 group
• to form a compound of the formula IV
• where
• R1, R2, R3, R4, R5, R6, R11 are as defined above and
• M2 is as defined above
• B) reacting the compound of the formula IV obtained from step A) with a compound of the formula V
• where
• R7, R8, R9 and R10 are as defined above and
• R14, R15 are identical and are trifluoromethyl and
• i is from 1 to 10 and
• j is from 1 to 10,
• to form a compound of the formula VI
• where
• R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 are as defined above and
• i and j are as defined above,
• C) reacting the compound of the formula VI obtained from step B) with a compound of the formula III as described in step A) to form a compound of the formula VII
• where
• R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 and R11 are as defined above and
• M2 is as defined above and
• n is 2 and
• i and j are as defined above, and
• A) reacting the compound of the formula VII obtained from step C) with a compound of the formula VIII
• M1(X1)f(X2)g(D)a
• where
• M1 is an element of transition groups I to VIII of the Periodic Table of the Elements and
• D is a donor solvent containing at least one oxygen atom and/or sulfur atom, and
• X1 and X2 are identical or different and are as defined above, and
• f is from 0 to 4, and
• g is from 0 to 4 and the sum of f+g corresponds to the oxidation state of the metal ion, and
• a is from 1 to 100,
• to give the target compound of the formula I.