Cinnamaldehyde (English: cinnamaldehyde) is an aldehyde organic compound, which is a yellow viscous liquid and exists in cinnamon and other plants. Cinnamaldehyde naturally occurring in nature has a trans structure, and its molecule is acrolein, which is connected with phenyl, so it can be considered as an acrolein derivative. The color of cinnamaldehyde is produced by π→π * transition, and the existence of * * yoke structure makes the absorption spectrum of cinnamaldehyde enter the visible light band.