Localized molecular orbitals, two- and three-center bond indices of 1,
5-dicarba-closo-pentaborane (5) and 1,5-dicarba-closo-pentaborane (3)
and thier hydrocarbon analogs bicyclo[1,1,1]-pentane and [1,1,1]propel
lane, respectively, have been calculated using a suitable basis set. N
o previously reported three-center CBC bond has been found. However, a
new three-center BCB bond has been observed in 1,5-dicarba-closo-pent
aborane (5). (C) 1995 John Wiley & Sons, Inc.