The spectra of enones and conjugated dienes

Abstract

The ultra-violet absorption spectra of α,β-unsaturated aldehydes, α,β-unsaturated ketones and conjugated dienes are discussed with special reference to the effect of steric interaction on spectra. Assignments of s-cis or s-trans conformations are made when possible. A modification of the rules for determining wavelength of maximal absorption in conjugated compounds is proposed. Some effects in the spectral curves of conjugated dienes are discussed. Evidence is presented that in these series spectra may be determined by inductive effects.