1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2 h; 2: With tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78 - 20°C; 2 h; 3: With hydrogenchloride in tetrahydrofuran; hexane

1.1: aq. HBr; sodium nitrite / H2O / 2 h / 5 - 10 °C 1.2: 6 g / Cu / H2O / 0.5 h / 50 °C 2.1: BuLi / tetrahydrofuran; hexane / 2 h / -78 °C 2.2: triisopropylborate / tetrahydrofuran; hexane / 2 h / -78 - 20 °C 2.3: 0.89 g / aq. HCl / tetrahydrofuran; hexane View Scheme

in water thallic chloride in H2O was refluxed with o-t-Bu-phenylboronic acid, giving a product after 1 min; the product was filtered off, washed with cold water, recrystd. from MeOH, and dried; elem.anal.;