1: BuLi 2: aq. H2SO4 3: Na2Cr2O7 4: LDA / tetrahydrofuran / 1.) - 78 deg C, 2.) -78 deg C to r.t. 5: SOCl2, pyridine / tetrahydrofuran / 18 h / Ambient temperature 6: K2CO3 / acetone / 11 h / Heating View Scheme

1: LDA / tetrahydrofuran / 1.) - 78 deg C, 2.) -78 deg C to r.t. 2: SOCl2, pyridine / tetrahydrofuran / 18 h / Ambient temperature 3: K2CO3 / acetone / 11 h / Heating View Scheme

1: aq. H2SO4 2: Na2Cr2O7 3: LDA / tetrahydrofuran / 1.) - 78 deg C, 2.) -78 deg C to r.t. 4: SOCl2, pyridine / tetrahydrofuran / 18 h / Ambient temperature 5: K2CO3 / acetone / 11 h / Heating View Scheme

potassium carbonate in acetone 11 h; Heating; Yield given;