1: CH2Cl2 / 48 h 2: 26 percent / benzene; various solvent(s) / 72 h / 110 °C View Scheme

<b>Multi-step reaction with 6 steps<br /> </b>1: 57 percent / H₂SO₄ conc. / H₂O / 7 h / Heating<br />2: 83 percent / aq. HCl / 20 h / 80 &deg;C<br />3: 54 percent / KOH / diethyl ether; methanol / 3 h<br />4: 70 percent / pyridine / CH₂Cl₂ <br />5: 77 percent / hydrazine hydrate / CH₂Cl₂ / 2 h<br />6: 60 percent / Na₂SO₄ / CH₂Cl₂ / 2 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 77 percent / hydrazine hydrate / CH₂Cl₂ / 2 h<br />2: 60 percent / Na₂SO₄ / CH₂Cl₂ / 2 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 70 percent / pyridine / CH₂Cl₂ <br />2: 77 percent / hydrazine hydrate / CH₂Cl₂ / 2 h<br />3: 60 percent / Na₂SO₄ / CH₂Cl₂ / 2 h<br /> <br /> &nbsp;