1.1: sec-butyllithium / tetrahydrofuran; cyclohexane / 4 h / -70 - 20 °C 1.2: tetrahydrofuran; cyclohexane / 16 h / -70 °C 2.1: hydroquinone; TFA / CH2Cl2 / 2 h / 20 °C View Scheme

1.1: sec-butyllithium / tetrahydrofuran; cyclohexane / 4 h / -70 - 20 °C 1.2: tetrahydrofuran; cyclohexane / 2 h / 20 °C 2.1: 0.31 g / boron trifluoride etherate; hydroquinone / tetrahydrofuran / 0.25 h / 20 °C View Scheme