cs400508v_si_001.pdf (505.45 kB)
Metallacyclobutane Substitution and Its Effect on Alkene Metathesis for Propylene Production over W–H/Al2O3: Case of Isobutene/2-Butene Cross-Metathesis
journal contribution
posted on 2013-09-06, 00:00 authored by Kai C. Szeto, Etienne Mazoyer, Nicolas Merle, Sebastien Norsic, Jean-Marie Basset, Christopher P. Nicholas, Mostafa TaoufikCross metathesis between 2-butenes
and isobutene yielding the valuable
products propylene and 2-methyl-2-butene has been investigated at
low pressure and temperature using WH3/Al2O3, a highly active and selective catalyst. Two
parallel catalytic cycles for this reaction have been proposed where
the cycle involving the less sterically hindered tungstacyclobutane
intermediates is most likely favored. Moreover, it has been found
that the arrangement of substituents on the least thermodynamically
favored tungstacyclobutane governs the conversion rate of the cross
metathesis reaction for propylene production from butenes and/or ethylene.