Oxonereg; 1.) acetone, H2O, RT, 30 min, 2.) 20 deg C, 3 d; Yield givenMultistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: aq. tetra-n-butylammonium bromide, 0.5 N aq. NaOH / CH₂Cl₂ / 3 h / 45 &deg;C<br />2: NaH / tetrahydrofuran / 3 h / Ambient temperature<br /> <br /> &nbsp;