Abstract
The tungsten(VI) complexes W(O-2,6-C 6H 3Cl 2) 2Cl 4 and W(O-2,6-C 6H 3Ph 2) 2Cl 4 are active catalysts for the metathesis of 1-octene in the presence of R 4Sn (R = Bu, Me) compounds as cocatalysts. Optimum metathesis conditions are an interaction time of ≥ 10 min, interaction and reaction temperatures > 65°C, Sn/W molar ratio = 3. Slow isomerisation (followed by secondary metathesis reactions) and dimerisation occur in parallel with the primary metathesis reaction i.e. the formation of 7-tetradecene and ethene. No metathesis is observed using W(O-2,6-C 6H 3Me 2) 2Cl 4 and W(O-2,6-C 6H 3Bu t 2) 2Cl 4 as catalysts under the same conditions. Deactivation of the catalytic systems are observed in the presence of added oxygenates. The W(O-2,6-C 6H 3Ph 2) 2Cl 4/Bu 4Sn catalytic system showed less deactivation than the W(O-2,6-C 6H 3Cl 2) 2Cl 4/Bu 4Sn catalytic system. The catalytic systems are also active in an air atmosphere.
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