potassium dihydrogenphosphate; Fremy’s salt; Adogen-464 in water; benzene 1.5 h; Ambient temperature;

1: 1.) KBH4, air, 2.) pyridine / 1.) THF/EtOH, 22 h, 2.) 0 deg C, overnight 2: 78 percent / methanol, NH3 / tetrahydrofuran / 48 h View Scheme