1: 2.45 g / K2CO3 / acetone / 3 h / Heating 2: 1.03 g / methanolic KOH / ethanol / 72 h / Ambient temperature 3: 200 mg / dimethylaniline / 4 h / 185 °C 4: 100 mg / NaOH / ethanol / 0.02 h / Heating View Scheme

potassium carbonate in acetone 1 h; Heating;

titanium tetrachloride; tetra-(n-butyl)ammonium iodide in dichloromethane T=-78°C; deprenylation; 1.16667 h;