1: sodium isopropoxide / propan-2-ol / 1.) 7 deg C, 5 h, 2.) RT, 48 h, 3.) reflux, 1 h 2: aq. NaOH / ethanol / 2 h / Heating 3: benzene / 18 h / Heating View Scheme

1: aq. NaOH / ethanol / 2 h / Heating 2: benzene / 18 h / Heating View Scheme

in benzene 18 h; Heating;