boron trifluoride diethyl etherate in acetic acid

zirconium sulphenyl phosphonate; formyl formic acid T=60°C; 1.5 h;

1: 1.) n-BuLi / 1.) THF, -76 deg C, 15 min, 2.) THF, from -76 deg C to RT 2: 52 percent / Raney Ni W-2, 1percent aq. NaOH / tetrahydrofuran / 5 h / Heating View Scheme