Fig. 2. (a) Comparison of the carboboration pathway and the B(C₆F₅)₃-catalyzed hydrosilylation of alkyne. Performed at the M06-2X/cc-pVTZ/(PCM, CH₂Cl₂)//M06-2X/6-311G(d,p)/(PCM, CH₂Cl₂) level of theory (energies are in kcal mol⁻¹); (b) optimized structures and NPA charges for ion-pair species II (with Me₃SiH) and II′ (with Me₂SiH₂).