Selective dimerisation of 1-hexene mediated by aluminium alkyl chloride-activated tungsten imido complexes

Abstract

The selective dimerisation of 1-hexene to dodecenes was accomplished using catalysts generated from a tungsten mono- [WCl4(NR)(thf)] or bis- [WCl2(NR)2(dme)] imido complex following activation with EtAlCl2. These catalytic systems achieve...

Recent developments in catalyst systems for selective oligomerization and polymerization of higher α-olefins

“…13, which can dimerize 1-hexene with activities comparable to other non-metallocenebased complexes studied earlier for such alpha olefin oligomerizations. 69 In contrast, when analogous Nb and Ta imido complexes were synthesized and tested for 1-hexene dimeriza- tion, almost all the catalysts showed very poor activity with <5% olefin conversion and total C 6 oligomer (C 12 + C 18 ) fraction yielding a mere 2%. The pronounced propensity for the isomerization of linear olefins to internal olefins (∼40% isomers) is mainly attributed to the Lewis acidic nature of the EtAlCl 2 activator employed in these reactions.…”