Catalytic complexes based on lanthanides for the...

Details Catalytic complexes based on lanthanides for the... Catalytic complexes based on lanthanides for the...

C - Chemistry, Metallurgy

07

F

C07F 5/00 (2006.01) C08F 4/52 (2006.01) C08F 36/04 (2006.01)

Patent

CA 2251403

Complexes of lanthanides are described, which are effective in the polymerization of conjugated dienes, obtained by reacting LnX3 with at least one Lithium compound selected from: (i) Li(A), the molar ratio Li(A)/LnX3 being from 1.5 to 2.5; (ii) LiLn(A)4, the molar ratio between LiLn(A)4 and LnX3 being from 0.5 to 1.5; wherein Ln is selected from any of the Lanthanides; X is selected from halides, carboxylates, alcoholates, -N(R x) (R y) wherein R x and R y, the same or different, are C1-C5 alkyl radicals; A is an allyl radical having the general formula Image , wherein R1, R2, R3, R4 and R5, the same or different, are selected from hydrogen and C1-C10 alkyl radicals.

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