Highly trans-stereospecific isoprene polymerization by neodymium borohydrido catalysts

abstract

Highly stereospecific polymerization of isoprene was achieved using borohydridoneodymium complexes. In combination with stoichiometric amounts of dialkylmagnesium, Nd(BH4)(3)(THF)(3) (1) and Cp*'Nd(BH4)(2)(THF)(2) (2) (Cp*' = C(5)Me(4)nPr) afford very efficient catalysts. The activity reaches 37300 (g of polyisoprene/mol of Nd)/h. Half-lanthanidocene 2 gives rise to polyisoprene, 98.5% trans-regular, the highest content yet described for a homogeneous organometallic catalyst. NMR experiments argue for the formation of bimetallic Nd(mu-BH4)Mg active species.

keywords

RARE-EARTH-METALS; BUTADIENE POLYMERIZATION; DIENE POLYMERIZATION; LANTHANIDE CATALYSTS; ALPHA-OLEFIN; COMPLEXES; COPOLYMERIZATION; COORDINATION; COCATALYST; MECHANISM

subject category

Polymer Science

authors

Bonnet, F; Visseaux, M; Pereira, A; Barbier-Baudry, D

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