potassium hydroxide reflux, 4 h, then reflux 4 h;

Multi-step reaction with 2 steps 1: 40 percent / 1.) 1percent aq. KOH; 2.) 10percent aq. KOH / reflux, 4 h, then reflux 4 h2: 22 percent / benzene / 2 h / Irradiation