1: 52 percent / Et3N, POCl3 / 1,2-dimethoxy-ethane / 1 h / -30 - -10 °C 2: 1) NaOH / 1) EtOH, 10 min, 2) r.t., 1 h View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '3556712', constants.ctx, '0')">potassium <i>tert</i>-butylate</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1209237', constants.ctx, '0')">ethylene glycol dimethyl ether</a> <br />T=-40&deg;C;&nbsp;0.166667&nbsp;h;&nbsp;<br /> &nbsp;