1: 1.) boron triluoride etherate, 2.) p-toluenesulfonic acid / 1.) acetone-water, r.t, 2 h, 2.) r.t, 12 h. 2: 89 percent / aqueus sodium hydroxide / ethanol / 6 h / Heating View Scheme

boron trifluoride diethyl etherate; toluene-4-sulfonic acid 1.) acetone-water, r.t, 2 h, 2.) r.t, 12 h.; Yield given. Multistep reaction;

<b>Multi-step reaction with 3 steps<br /> </b>1: 1.) Brockmann I alumina, 2.) potassium dichromate, H₂SO₄, tetrabutylammonium hydrogen sulphate / 1.) 24 h, r.t, 2.) CH₂Cl₂, -5 deg C, 3 h.<br />2: 93 percent / methanol / 10 h / Ambient temperature<br />3: 90 percent / Lithium aluminium hydride / tetrahydrofuran / 0.5 h / 0 &deg;C<br /> <br /> &nbsp;