hydrogenchloride in water T=20 - 80°C; 2 h;

selenium(IV) oxide in ethanol Condensation;

1: Raney Ni, H2 / ethanol 2: SeO2 View Scheme

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1: HNO3, H2SO4 2: HI, HCl 3: 77.5 percent / ethanol / 0.5 h / Heating 4: 70 percent / Raney Ni, H2 / propan-2-ol 5: 1.) NaNO2, H3PO4, 2.) H3PO4 / 1.) H2O, 2-5 deg C, 45 min, 2.) H2O, reflux, 45 min View Scheme