Its color is due to the ? -> ?* transition: increased conjugation in comparison with acrolein shifts this band towards the visible.

The molecule can be identified by characteristic spectroscopic signals. Infrared spectra show strong absorption bands near 1685 cm^-1 (C=O stretch) and 1620 cm^-1 (C=C stretch). In the proton nuclear magnetic resonance (¹H NMR) spectrum, the aldehydic proton resonates around 9.6 ppm, while aromatic and vinyl protons appear between 6.3 and 7.6 ppm.

Biosynthesis

Cinnamaldehyde

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