... Chemical shifts are reported in ppm with the solvent (CDCl 3 ) resonance as the δ 7.26 ppm (s = singlet, d ... The organic layer was dried over Na 2 SO 4 , filtered and concentrated under reduced pressure. ... 2-ol 6. To a solution of β-ketosulfoxide 5 (614 mg, 1.28 mmol) in 10 mL of ...