Abstract Amine borane and amine trideuterioborane adducts have been obtained in good yield by the crown-ether-catalysed reaction of R 3 N· HCl with NaBH 4 and NaBD 4 in ether. The absence of isotopic exchange in the reaction with NaBD 4 is demonstrated by IR and 11 B and 2 H nuclear magnetic resonance spectra of Me 3 N· BD 3.
