pyridine; toluene-4-sulfonic acid in acetone 2 h; Heating;

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '4123663', constants.ctx, '0')">diisobutylaluminium hydride</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1696894', constants.ctx, '0')">diethyl ether</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '635760', constants.ctx, '0')">toluene</a> <br />&nbsp;a) -75 deg C, 1 h, b) -10 deg C, 0.5 h;&nbsp;<br /> &nbsp;

Stage #1: <b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1098214', constants.ctx, '0')">hydrogenchloride</a> <br />T=20&deg;C;&nbsp;0.5&nbsp;h;&nbsp;<br />Stage #2: <b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '4267587', constants.ctx, '0')">potassium carbonate</a> <br />&nbsp;Further stages.;&nbsp;<br /> &nbsp;