zirconium tetrachloride in acetonitrile T=20°C; 0.25 h;

1.1: NaOH / 12 h / 20 °C 2.1: β-cyclodextrin / H2O; acetone / 60 °C 2.2: 89 percent / thionyl chloride / H2O; acetone / 10 h / 20 °C View Scheme