Our research was carried out by AM1 semiempirical calculations in order to
show the reaction mechanism of the rearrangement of 2,3-dihydro-1,2-diazepi
n-4-ol to 8-oxa-1,2-diazabicyclo[3.2.1]octene. We will show three different
routes for these rearrangements. The molecular reactivity was established
starting from the molecular orbitals, mainly the frontier molecular orbital
s and some of their neighbors. (C) 1999 Elsevier Science B.V. All rights re
served.