1: hydrazine hydrate / methanol / 24 h / -5 - 0 °C 2: acetic acid / 24 h / Reflux View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '2037554', constants.ctx, '0')">sulfuric acid</a> <br />6&nbsp;h;&nbsp;&nbsp;Reflux;&nbsp;<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: NaHS monohydrate / water / 14 h / -5 &deg;C / Heating<br />2: sulfuric acid / 6 h / Reflux<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: sulfuric acid; hydrogen bromide / 3 h / Reflux<br />2: NaHS monohydrate / water / 14 h / -5 &deg;C / Heating<br />3: sulfuric acid / 6 h / Reflux<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1.1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / chloroform / |Reflux<br />2.1: thiolacetic acid potassium salt / acetone / 20 &deg;C<br />2.2: 20 &deg;C<br /> <br /> &nbsp;