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Issue 30, 2011
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Highly trans-1,4 selective (co-)polymerization of butadiene and isoprene with quinolyl anilido rare earth metal bis(alkyl) precursors

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Abstract

The N-R-quinolinyl-8-amino ligands HL1–3 (R = 2,6-iPr2C6H3 (HL1), 2,6-Et2C6H3 (HL2), 2,6-Me2C6H3 (HL3)) have been prepared, which reacted readily with one equiv. of rare earth metal tris(alkyl)s to afford the corresponding bis(alkyl) complexes L1Y(CH2SiMe3)2(THF) (1) and L1–3Lu(CH2SiMe3)2(THF) (2–4) viaalkane elimination. Contrastingly, treatment of the in situ generated neodymium tri(alkyl)s with HL1 afforded a mono(alkyl) neodymium complex (5). Complexes 1, 2 and 5 in combination with aluminium alkyls and organoborates established homogenous ternary systems that exhibited versatile catalytic activities and trans-1,4 selectivities for the polymerization of butadiene, depending on the types of aluminium alkyl, organoborate and rare earth metal used. Furthermore, the trans-1,4 selective copolymerization of butadiene and isoprene was achieved by using the ternary system of 1/AlMe3/[Ph3C][B(C6F5)4]. Both the kinetics of copolymerization and the thermal behavior of the copolymers were investigated.

Graphical abstract: Highly trans-1,4 selective (co-)polymerization of butadiene and isoprene with quinolyl anilido rare earth metal bis(alkyl) precursors

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Publication details

The article was received on 18 Jan 2011, accepted on 01 Mar 2011 and first published on 25 Mar 2011


Article type: Paper
DOI: 10.1039/C1DT10100E
Citation: Dalton Trans., 2011,40, 7755-7761
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    Highly trans-1,4 selective (co-)polymerization of butadiene and isoprene with quinolyl anilido rare earth metal bis(alkyl) precursors

    D. Liu and D. Cui, Dalton Trans., 2011, 40, 7755
    DOI: 10.1039/C1DT10100E

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