Benzyne precursor. In the presence of excess of a Grignard reagent, the initially formed benzyne undergoes nucleophilic addition to give an ortho-substituted phenylmagnesium halide: Synth. Commun., 18, 1749 (1988). Regioselective Suzuki coupling with arylboronic acids has been achieved giving 2-bromobiphenyl derivatives: Synlett, 207 (1992).