The presence of 18-crown-6 in the Lewis acid-promoted dehydrocoupling reaction of ammonia borane permits isolation of [(THF)BH2NH3]+ and [BH2(NH3)2]+ cations. [(THF)BH2NH3]+ reacts with Lewis bases to give either boron adducts or by deprotonation at nitrogen to give borazine and ammonia-borane.
R. J. Less, R. García-Rodríguez, H. R. Simmonds, L. K. Allen, A. D. Bond and D. S. Wright, Chem. Commun., 2016, 52, 3650 DOI: 10.1039/C6CC00088F
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