Patent ID: 6822106
Filing Date: 2004-11-23
Classification: C07F,C08F,Y10S

Abstract:
A process for the preparation of a ligand of formula (V):SiR1R2Qâ€²Lâ€²â€ƒâ€ƒ(V) whereinR1 and R2, the same or different from each other, are selected from hydrogen, a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radical, optionally containing heteroatoms belonging to groups 13 or 15-17 of the Periodic Table of the Elements; optionally R1 and R2 form a ring comprising from 3 to 8 atoms, which can bear substituents; Qâ€² is a moiety of the general formula (VI): or its double bond isomers,wherein A and B are selected from sulfur (S), oxygen (O) or CR5, R5 being selected from hydrogen, a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radicals optionally containing heteroatoms belonging to groups 13 or 15-17 of the Periodic Table of the Elements; either A or B being different from CR5, and wherein the rings containing A and B have a double bond in the allowed position having an aromatic character; if A is S or O, B is CR5 or if B is S or O, A is CR5; R3 and R4, the same or different from each other, are selected from hydrogen, a C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl optionally containing heteroatoms belonging to groups 13 or 15-17 of the Periodic Table of the Elements; Lâ€² is a moiety of the general formula (VII): or its double bond isomers,wherein R6, R7, R8 and R9, the same or different from each other, are selected from C1-C20-alkyl, C3-C20-cycloalkyl, C2-C20-alkenyl, C6-C20-aryl, C7-C20-alkylaryl or C7-C20-arylalkyl radicals optionally containing heteroatoms belonging to groups 13 or 15-17 of the Periodic Table of the Elements; and at least two adjacent R6 and R7 or R8 and R9 can form a ring comprising from 3 to 8 atoms, optionally bearing substituents and optionally containing heteroatoms belonging to groups 13 or 15-17 of the Periodic Table of the Elements; comprising the following steps: i) treating a compound of formula (VIII) with at least one equivalent of a base selected from the group consisting of metallic sodium and potassium, sodium and potassium hydroxide and an organolithium compound; â€ƒwherein the rings containing A and B have a double bond in the allowed position having an aromatic character; A, B, R3 and R4 are defined as above; ii) contacting the corresponding anionic compound obtained from step i) with a compound of general formula (IX): YLâ€²SiR1R2â€ƒâ€ƒ(IX) â€ƒwherein Lâ€², R1, R2 have the meaning described above and Y is a halogen atom selected from the group consisting of fluoride, chloride, bromide and iodide.