1: 1) 50percent aq. NaOH / 1) water-methylene chloride, 2) xylene, reflux, 2.5 h 2: 84 percent / 50percent aq. NaOH / propan-2-ol / 7 h / Heating View Scheme

sodium hydroxide 1) water-methylene chloride, 2) xylene, reflux, 2.5 h; Yield given. Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: phosgene, imidazole / CH₂Cl₂ / 2.5 h / 25 &deg;C<br />2: CH₂Cl₂ / 16 h / 25 &deg;C<br /> <br /> &nbsp;