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-Me3Pz)2 (Ar = phenyl or p-tolyl), with W(CO)5THF results in the oxidative addition of the tin−carbon(sp3) 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 κ3-[N,C,N] chelating ligand.