Separations 2023 , 10 , 148
13of 15
Figure8. Possible degradation paths of palmitic acid.
As shown in Figure 9, the degradation of stilbene may follow as: ozone and C=C on styrene generate unstable primary ozonate-4-phenyl-1,2,3-trioxane through the dipolar cycloaddition reaction. Due to the asymmetric structure of styrene, the primary ozonides 4-phenyl-1,2,3-Trioxolane recombine to form new epoxides 3-phenyl-1,2,4-Trioxolane; the epoxides are decomposed to form intermediate benzaldehyde, which is then oxidized to benzoic acid by ozone; subsequently, the aromatic ring in benzoic acid is destroyed by ozone; then, it opens to form maleic anhydride and formaldehyde, which are eventually oxidized and degraded into carbon dioxide and water by ozone.
Figure9. Possible degradation paths of stilbene.
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