Paramagnetic 1,3-dimetallacyclobutadienes of tungsten(VI): -2,4-bis(trimethylsilyl)-1,3-dihalogeno-l,1,3,3-tetrakis(trimethylsilylmethyl)-1,3-ditungstacyclobutadienes

Abstract

Addition of halogens, X₂, to hydrocarbon solutions of [(Me₃SiCH₂)₂W(µ-CSiMe₃)]₂ leads to the novel paramagnetic W^VI containing compounds [X(Me₃SiCH₂)₂W(µ-CSiMe₃)]₂, where X = Cl, Br, and I, which contain tungsten atoms in a pseudo trigonal bipyramidal environment (X axial) joined along a common axial–equatorial edge by the µCSiMe₃ ligands (W–W 2.75 Å).