The reaction is composed of three different reactions as follows:1.Attack of N of DMA on O1 of BHP to give a N-oxide (Scheme 1, in Text),2.Formation of a hydrogen bond type complex (Scheme 2, in Text).

• DMA的N攻击BHP的O~1而形成N-氧化物(方式1); (2)生成氢键复合物(方式2);