“…Amine−borane adducts have been used extensively as hydroborating agents because of their distinct advantages over diborane itself, which is a highly pyrophoric, toxic gas, or the two other commonly used borane carriers, BH 3 ·THF and BH 3 ·SMe 2 . Both are very active hydroboration agents but borane-THF suffers from instability over prolonged periods of time and is only available as a relatively low concentration solution in THF (∼1 M, usually stabilized with N -isopropyl- N -methyl- t butylamine).…”