Tungsten imido catalysts for selective ethylene dimerisation

A tungsten imido complex W(NDipp)Me3Cl (Dipp = 2,6-Pr-i-C6H3) is active for the selective dimerisation of ethylene to yield 1-butene under mild conditions. Immobilisation and activation of W(NDipp)Cl-4(THF) on layered double hydroxides, silica or polymethylaluminoxane yields active solid state catalysts for the selective dimerisation of ethylene. The polymethylaluminoxane-based catalyst displays a turnover frequency (4.0 mol(C2H4) mol(W)(-1) h(-1)) almost 7 times that of the homogeneous catalyst.