1: 98 percent / SOCl2, DMF / CH2Cl2 / 2 h / 20 °C 2: 92 percent / NaOEt / ethanol; dimethylformamide / 1 h 3: NaOH / ethanol; H2O 4: 0.5 h / 160 °C View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '11342937', constants.ctx, '0')">potassium hydroxide</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '3587191', constants.ctx, '0')">dihydrogen peroxide</a> <br />&nbsp;1) CH₃OH, H₂O, 15 deg C, 45 min; 2) ice water, 10 min;&nbsp;&nbsp;Yield given. Multistep reaction. Yields of byproduct given;&nbsp;<br /> &nbsp;