1: 90 percent / glacial acetic acid, DDQ / diethyl ether / 1.) 0 deg C, 1 h, 2.) 25 deg C, 2 h 2: 10 percent 3: 100 percent / aq. HI (57 percent) / benzene / 2 h 4: 68 percent / Me3SiCl, Zn / tetrahydrofuran / Heating 5: 90 percent / sodium hydride / tetrahydrofuran / 4 h / Ambient temperature 6: 100 percent / toluene-4-sulphonic acid / benzene / 0.03 h / Heating View Scheme

<b>With</b>&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, '969212', constants.ctx, '0')">benzene</a> <br />40&nbsp;h;&nbsp;&nbsp;Heating;&nbsp;<br /> &nbsp;