sulfuric acid 1 h;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '605759', constants.ctx, '0')">phosphonic acid diethyl ester</a> <br />&nbsp;1) 5 min, 2) hydrolysis (pH 5);&nbsp;&nbsp;Yield given. Multistep reaction;&nbsp;<br /> &nbsp;