1.1: xylene / 1.5 h / Reflux 2.1: sodium hydroxide; water / 1.5 h / 70 °C 2.2: pH 3 View Scheme

potassium carbonate in dimethyl sulfoxide T=20°C; 3 h;

in xylene 1.5 h; Reflux;

<b>Multi-step reaction with 2 steps<br /> </b>1: hydroxylamine hydrochloride / water; dimethyl sulfoxide / 18 h / 90 &deg;C<br />2: pyridine / N,N-dimethyl-formamide / 6 h / |Cooling with ice; |Inert atmosphere<br /> <br /> &nbsp;