3,4,5,6-tetrachloro-1,2-benzoquinone; acetic acid in toluene 24 h; Ambient temperature; Yield given;

Stage #1: <a href="#" onclick="return RXDsubstances(event, this, '3539734', constants.ctx, '0')">phenyl-magnesium chloride</a>; <a href="#" onclick="return RXDsubstances(event, this, '3621847', constants.ctx, '0')">4-bromo-pyridine-hydrochloride</a> &nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '102391', constants.ctx, '0')">tetrahydrofuran</a> <br />T=-78&deg;C;&nbsp;0.25&nbsp;h;&nbsp;<br />Stage #2: <a href="#" onclick="return RXDsubstances(event, this, '606778', constants.ctx, '0')">phenyl chloroformate</a> &nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '102391', constants.ctx, '0')">tetrahydrofuran</a> <br />T=-78 - 20&deg;C;&nbsp;<br /> &nbsp;