sodium tetrahydroborate; iodine in tetrahydrofuran

in neat (no solvent) byproducts: H2, SMe2; to BH3*SMe2 at 0°C under Ar was added the amine, stirred until evolution of H2 had ceased, Me2S was removed at high vac., heated to 120°C over a period of 90 min, left for 1.5 h at this temp.; cooling, distn. under Ar;