Ab initio MO and DFT calculations up to the CCSD(T)/6-311++G(3df, 2p) level have been
applied to the disagreement between theory and experiment concerning the standard enthalpies of formation
of methylketene and dimethylketene. Our results confirm previous theoretical (G2) values, as well as the
experimental proton affinities and ionization energies of both alkylketenes.
