1: oxalyl chloride / benzene / 1.5 h / Heating 2: 33 percent / triethylamine / benzene / 1 h / Heating View Scheme

<b>Multi-step reaction with 4 steps<br /> </b>1: hydroxylamine<br />2: N-chloro-succinimide / N,N-dimethyl-formamide<br />3: magnesium sulfate; triethylamine / toluene / 20 &deg;C<br />4: water; sodium hydroxide / ethanol<br /> <br /> &nbsp;