1: MCPBA, NaHCO3 / CH2Cl2 / 1 h / 0 °C 2: 93 percent / (i-PrO)3Al / toluene / 6 h / Heating View Scheme

1: MCPBA, NaHCO3 / CH2Cl2 / 1 h / 0 °C 2: 93 percent / (i-PrO)3Al / toluene / 6 h / Heating 3: 99 percent / propionic acid / 1 h / 140 °C 4: 94 percent / 2 N NaOH / methanol / 4 h / Ambient temperature View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '472690', constants.ctx, '0')">toluene-4-sulfonic acid</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '506104', constants.ctx, '0')">ethyl acetate</a> <br />1.5&nbsp;h;&nbsp;&nbsp;Ambient temperature;&nbsp;&nbsp;Yield given;&nbsp;<br /> &nbsp;