The Infrared Absorption Spectra of the n-2 Trans, 4 Trans Dienaldehydes, C ₅ through C ₁₂

The infrared absorption spectra of the normal 2, 4-dienaldehydes, from pentadienal through dodecadienal, were measured in the liquid state over the spectral range from 400 to 4000 cm −1 . The compounds were prepared by conventional methods and purified by gas-liquid chromatographic procedures immediately before spectrophotometry. Two strong bands near 1685 and 1643 cm −1 , four strong bands in the 980-1180 cm −1 region, and a doublet in the aldehyde C-H stretching region are characteristic of the n-2 tram, 4 tram dienal structure.