Tetrapropylammonium tetrafluoroborate in N,N-dimethyl-formamide cathodic reduction;

<b>Multi-step reaction with 2 steps<br /> </b>1: 1 M KOH / methanol / Ambient temperature<br />2: 2 h / 160 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 4 steps<br /> </b>1: 40percent aq. sodium bisulphite / 3 h<br />2: ethanol / 2 h / Heating<br />3: 1 M KOH / methanol / Ambient temperature<br />4: 2 h / 160 &deg;C<br /> <br /> &nbsp;