1: acetic acid; aqueous HBr 2: acetic acid; bromine 3: formic acid View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '103233', constants.ctx, '0')">pyridine</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '5362527', constants.ctx, '0')">pyridinium bromide perbromide</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1730800', constants.ctx, '0')">dichloromethane</a> <br />T=20&deg;C;&nbsp;&nbsp;Inert atmosphere;&nbsp;<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1.1: potassium carbonate / tetrahydrofuran; ethanol / 72 h / 20 &deg;C<br />2.1: trichlorophosphate / 0 &deg;C / |Inert atmosphere<br />2.2: 12 h / 20 &deg;C / |Inert atmosphere<br />2.3: 1 h / 20 &deg;C<br />3.1: pyridinium bromide perbromide; pyridine / dichloromethane / 20 &deg;C / |Inert atmosphere<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1.1: trichlorophosphate / 0 &deg;C / |Inert atmosphere<br />1.2: 12 h / 20 &deg;C / |Inert atmosphere<br />1.3: 1 h / 20 &deg;C<br />2.1: pyridinium bromide perbromide; pyridine / dichloromethane / 20 &deg;C / |Inert atmosphere<br /> <br /> &nbsp;