反应条件
<b>With</b> <a href="#" onclick="return RXDsubstances(event, this, '385737', constants.ctx, '0')">acetic anhydride</a>; <a href="#" onclick="return RXDsubstances(event, this, '472690', constants.ctx, '0')">toluene-4-sulfonic acid</a> <br />T=110°C; 20 h; <br /> <br />