Highly trans-1,4 selective (co-)polymerization ofbutadiene and isoprene with quinolyl anilido rare earth metal bis(alkyl) precursors
writer：Dongtao Liu and Dongmei Cui
keywords：aluminium alkyl，copolymerization ，butadiene ， isoprenewas，catalytic activities
source：期刊
specific source：http://pubs.rsc.org/en/content/articlepdf/2011/dt/c1dt10100e
Issue time：2011年
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 ofbutadiene, depending on the types of
aluminium alkyl, organoborate and rare earth metalused. Furthermore,
the trans-1,4
selective copolymerization of butadiene and isoprenewas
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.
