1.1: n-BuLi / hexane; benzene / 10 h / -25 °C 1.2: 70 percent / BrCF2CF2Br / hexane; benzene; tetrahydrofuran / 0.5 h / 20 °C 2.1: aq. HCl / tetrahydrofuran / 0.17 h / 20 °C View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '3746114', constants.ctx, '0')">tetra-N-butylammonium tribromide</a>;&nbsp;<a href="#" onclick="return RXDsubstances(event, this, '969215', constants.ctx, '0')">trimethyl orthoformate</a> <br />16&nbsp;h;&nbsp;<br /> &nbsp;