Isolated CH stretching frequencies, bond lengths and dissociation energies in some haloalkanes and alkenes

Abstract

Isolated CH stretching frequencies (ν is CH) have been obtained for a variety of haloalkanes and alkenes. These have been used to predict CH bond lengths, dissociation energies and force constants. Use of substituent effect S values from previous studies to predict ν is CH demonstrates that the effects of α- and β-substitution by halogens are approximately additive in the case of the haloalkenes but non-additive for the alkanes.