The mechanism of the rearrangement reaction of singlet H2N=B: --> HNBH has
been studied by using ab initio method of quantum chemistry. The result sho
ws that the transition state of the rearrangement reaction has a three-memb
ered ring structure. On the basis of the results of the ab initio calculati
on, the thermodynamic and kinetic properties of the rearrangement reaction
have been obtained.