1: 77 percent / hydrazine hydrate / CH2Cl2 / 2 h 2: 60 percent / Na2SO4 / CH2Cl2 / 2 h 3: CH2Cl2 / 48 h 4: 26 percent / benzene; various solvent(s) / 72 h / 110 °C View Scheme

sodium methylate in methanol T=70°C;