Synthesis and reactivity of tantalocene zwitterions stabilized by ground-state alpha-agostic interactions via reaction of B(C6F5)(3) with Cp ' Ta-2(=CH2)(CH3) (Cp ' = C5H5, C5H4Me)
Ks. Cook et al., Synthesis and reactivity of tantalocene zwitterions stabilized by ground-state alpha-agostic interactions via reaction of B(C6F5)(3) with Cp ' Ta-2(=CH2)(CH3) (Cp ' = C5H5, C5H4Me), ORGANOMETAL, 19(12), 2000, pp. 2243-2245
Zwitterionic tantalocene derivatives are formed when the perfluorophenyl-su
bstituted borane B(C6F5)(3) is reacted with the tantalocene methyl methylid
ene complexes Cp'Ta-2(=CH2)(CH3) (Cp' = C5H5, C5H4Me). The products arise f
rom borane attack of the methylidene ligand and are characterized by a stro
ng, ground-state alpha-agostic interaction, and insertion. of tert-butyl is
ocyanide occurs exclusively into the agostic Ta-C bond, producing iminoacyl
zwitterions.