Synthesis and X-ray crystal structure of a Wv metallocycle [{W(CH2C6H4CH2-o)2O}2Mg(tetrahydrofuran)4]

Abstract

Reaction of[WCl₄(O)] with eithero-C₆H₄(CH₂MgCl)₂ or Mg{(CH₂)₂C₆H₄-o}(htf) in tetrahydrofuran (thf) gives the W^V complex [{[graphic omitted]H₂-o₂[graphic omitted]g(thf)₄], (1)via W^v oxochloride intermediates; that one of the o-xylidene chelating ligands has a large fold angle (66·1%deg;, of 42·.4° for the other) possibly owing to an aromatic π-interaction with the tungsten atom.