Lithium amidoborane (LiNH2BH3, LiAB for short), is capable of chemoselectively reducing α,β-unsaturated ketones to the corresponding allylic alcohols at ambient temperature. A mechanistic study shows that the reduction is via a double hydrogen transfer process. The protic H(N) and hydridic H(B) in amidoborane add to the O and C sites of the carbonyl group, respectively.
酰胺基
硼烷锂(LiNH 2 BH 3,简称LiAB)在环境温度下能够将α,β-不饱和酮
化学选择性还原为相应的烯丙基醇。机理研究表明,还原是通过双氢转移过程进行的。酰胺基
硼烷中的质子H(N)和氢H(B)分别加到羰基的O和C位上。