1: 90 percent / imidazole / dimethylformamide / 24 h 2: 93 percent / bis<2,2,2-trifluoro-1-phenyl-1-(trifluoromethyl)ethoxy>diphenylsulfurane / CCl4 / 70 h / Ambient temperature 3: 99 percent / diisobutylaluminium hydride / toluene / 1 h / -78 °C 5: 85 percent / n-butyl lithium / hexane; tetrahydrofuran / a) -78 deg C, 30 min, b) -70 deg C, 2 h, c) to r.t., 2 h 6: 86 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 1 h / Ambient temperature View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '3593646', constants.ctx, '0')">sodium ethanolate</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '1718733', constants.ctx, '0')">ethanol</a> <br />T=0&deg;C;&nbsp;3&nbsp;h;&nbsp;<br /> &nbsp;