Ring strain enthalpies for a series of cyclic amine-boranes (1-azonia-
2-boratacycloalkanes) were calculated from MP4(SDTQ)/6-31G//MP2/6-31G
energies by the group equivalent method. Small rings exhibit smaller
RSEs than do the corresponding cycloalkanes; larger rings exhibit RSE
s essentially identical to those of the corresponding cycloalkanes. (C
) 1998 Elsevier Science Ltd. All rights reserved.