1.1: tert-butyllithium / pentane; tetrahydrofuran / 1 h / -78 - -5 °C 1.2: pentane; tetrahydrofuran / 1 h / -78 °C 2.1: 70 percent / PdCl2(CH3CN)3 / acetone / 24 h / 20 °C View Scheme

(i) NaOEt, EtOH, (ii) /BRN= 969135/, (iii) aq. H2SO4; Multistep reaction;