The present study shows that the anion of 2-naphthylacetonitrile is substituted selectively at its C_α by aromatic halides, through a radical nucleophilic substitution mechanism, to give the corresponding α,α-diaryl nitriles in good yields. The regioselectivity of this ambident nucleophile changes with the steric hindrance at the radical centre from the aromatic substrate. The selectivity observed was investigated through a computational model of the key reaction step.