1.1: AcOH; iron / ethanol / 2.5 h / Heating 1.2: 70 percent / pyridine / CH2Cl2 / 72 h / 20 °C 2.1: 98 percent / K2CO3 / acetonitrile / 1 h / Heating 3.1: vinyloxytrimethylsilane / (1,3-dimesitylimidazolidin-2-ylidene)RuCl2(PCy3)(=CHPh) / CH2Cl2 / 4 h / Heating 3.2: 33 percent / (1,3-dimesitylimidazolidin-2-ylidene)RuCl2(PCy3)(=CHPh) / toluene / 24 h / Heating View Scheme

Stage #1: <b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '506297', constants.ctx, '0')">methanesulfonyl chloride</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '605283', constants.ctx, '0')">triethylamine</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1730800', constants.ctx, '0')">dichloromethane</a> <br />T=0 - 20&deg;C;&nbsp;2&nbsp;h;&nbsp;<br />Stage #2: <b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '508906', constants.ctx, '0')">1,8-diazabicyclo[5.4.0]undec-7-ene</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1730800', constants.ctx, '0')">dichloromethane</a> <br />2&nbsp;h;&nbsp;&nbsp;Heating;&nbsp;<br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1.1: 82 percent / KOH / H₂O; dimethylsulfoxide / 1 h / 20 &deg;C<br />2.1: methanesulfonyl chloride; Et₃N / CH₂Cl₂ / 2 h / 0 - 20 &deg;C<br />2.2: 82 percent / DBU / CH₂Cl₂ / 2 h / Heating<br /> <br /> &nbsp;