Structure and Reactivity of Chromium(VI) Alkylidenes

Bis­(arylimido)­Cr­(VI)
dialkyls lacking β-hydrogen decompose
by α-hydrogen abstraction and, upon trapping with triphenylphosphine,
yield isolable alkylidene complexes. Two such complexes, namely (ArN)2CrCHR­(PPh3) (R = tBu, SiMe3), have been structurally characterized. The coordinatively
unsaturated alkylidene intermediates are highly reactive; they effect
CH activation of saturated hydrocarbons and they react with
olefins to produce metallacyclobutanes.