An Unprecedented κ3-[N,C,N] Coordination Mode of the Bis(3,4,5-trimethylpyrazol-1-yl)methide Ligand

Abstract

Treatment of triarylstannyl-bis(3,4,5-trimethylpyrazol-1-yl)methane, Ar3SnCH(3,4,5-Me 3 Pz) 2 (Ar = phenyl or p-tolyl), with W(CO) 5 THF results in the oxidative addition of the tin-carbon(sp 3 ) bond to the tungsten(0) center to yield the heterodinuclear complexes CH(3,4,5-Me3Pz) 2 (CO)3W-SnAr3, in which four-membered metallacycles are found and bis(3,4,5-trimethylpyrazol-1-yl)methide acts as a tridentate monoanionic κ 3 -[N,C,N] chelating ligand.