2: 84 percent / mol. sieve, 2-butanone, aluminium isopropylate / benzene / 12 h / Heating View Scheme

2: 84 percent / mol. sieve, 2-butanone, aluminium isopropylate / benzene / 12 h / Heating 3: 1.) LDA; 2.) 6 percent HCl / 1.) THF, 2.5 h; 2.) MeOH, 60-70 deg C, 3 h View Scheme