The bond dissociation energies of 1-butene (CH2=CHCH2CH3) and several
calibration systems are computed using the G2(MP2) approach. The agree
ment between the calibration systems and experiment is very good. The
computed values for l-butene are compared with those for the calibrati
on systems and the agreement between the computed results for l-butene
and the 'rule of thumb' values from the smaller systems is remarkably
good.