Structure–Property Relationships and Identification of Cinnamic Acid Derivatives: Carboxyl-Group Ionization, Aromatic-Ring Substitution, and Conjugation Effects
The aromatic ring provides the C6 portion, while the —CH=CH–COOH side chain constitutes the C3 portion. The C=C double bond lies between the aromatic ring and the carboxyl group, giving the side chain a continuous Ar–C=C–C=O conjugated structure.
危险品化学品经营许可证（带存储）