1: H3PO2, aq. HCl / ethanol 2: aq. NaOH / Heating View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 3,4,5,6-tetrachloro-&lt;1,2&gt;benzoquinone / dioxane<br />2: (i) TsNHNH₂, CH₂Cl₂, (ii) Al₂O₃ <br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: aq. H₂O₂, NaOH<br />2: 3,4,5,6-tetrachloro-&lt;1,2&gt;benzoquinone / dioxane<br />3: (i) TsNHNH₂, CH₂Cl₂, (ii) Al₂O₃ <br /> <br /> &nbsp;