formic acid in tetrahydrofuran; 1,4-dioxane; methanol

hydrogenchloride; sodium nitrite in ethanol; water 1.) 0 deg C, 30 min, 2.) 25 deg C, 1.5 h;

1: 60 percent / 1M aq. NaOH / CHCl3; diethyl ether / 3 h / 0 °C 2: 42 percent / NaNO2, HCl / ethanol; H2O / 1.) 0 deg C, 30 min, 2.) 25 deg C, 1.5 h View Scheme