Stereospecific polymerization of isoprene with Nd(BH4)(3)(THF)(3)/MgBu2 as catalyst

resumo

The neodymium trisborohydride Nd(BH4)(3)(THF)(3) (THF=tetrahydrofuran) has been used as a catalyst precursor for isoprene polymerization for the first time. Associated to an excess of Al(Et)(3), the resulting catalyst is moderately active, giving a mixture of cis- and trans- polymer. Addition of a stoichiometric amount of MgBu2 to Nd(BH4)(3)(THF)(3) affords a stereospecific catalyst providing trans-1,4-polyisoprene, more than 96% regular. That dual component Nd/Mg system also shows a better efficiency and good control of the molecular weights. A molecular structure is tentatively attributed to a bimetallic active species, based on H-1 NMR experiments.

palavras-chave

LANTHANIDE CATALYSTS; COPOLYMERIZATION; COORDINATION; PRECURSORS; CHEMISTRY; PROGRESS

categoria

Polymer Science

autores

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

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