sodium tetrahydroborate in tetrahydrofuran; water 0.0833333 h; Ambient temperature; Yields of byproduct given;

1: 93 percent / pyridine / acetonitrile / 1 h / Ambient temperature 2: 70 percent / gas. HBr / acetonitrile / 0.25 h / Ambient temperature 3: 99 percent / Ni(OAc)4*4H2O / ethanol / 1 h / Ambient temperature View Scheme