potassium tert-butylate in ethanol 120 h; further reagents, solvents; Product distributionMechanism;

Multi-step reaction with 2 steps 1: 1.) 17 h, 50 deg C, 2.) H2O, 3 h, r. t.2: 92 percent / aq. KOH / ethanol; diethyl ether / -35 °C