Overview
4-Aminocinnamic acid is an organic compound derived from cinnamic acid, featuring an amino group at the para position of the phenyl ring. It serves as a versatile intermediate in pharmaceuticals and fine chemical synthesis. The compound exhibits unique photochemical properties, making it valuable in UV-absorbing applications. Its structural similarity to natural amino acids allows integration into peptide-based drug development. Industrial-scale production typically involves catalytic amination of halogenated cinnamic acid derivatives or specialized condensation reactions.
Physical and Chemical Properties
As a crystalline solid, 4-aminocinnamic acid demonstrates thermal stability up to its decomposition point near 240°C. The conjugated π-electron system between the phenyl ring and carboxylic acid group contributes to its UV absorption characteristics, with peak absorbance typically observed around 280-320 nm. The compound shows amphoteric behavior due to the presence of both acidic (-COOH) and basic (-NH2) functional groups. Protonation states vary significantly with pH, affecting solubility and reactivity. In alkaline conditions, it forms water-soluble salts through carboxylate anion formation.
Main Applications
In pharmaceutical manufacturing, 4-aminocinnamic acid functions as a building block for serotonin receptor modulators and other bioactive molecules. Its UV-absorbing properties make it suitable for specialty sunscreens and optical materials where selective light filtration is required. The chemical industry utilizes this compound as a precursor for advanced materials including liquid crystals and photoresist polymers. Research applications include fluorescence labeling in biochemical assays and as a model compound for studying electron transfer processes in conjugated systems.
Safety and Storage
As an amino-substituted aromatic compound, proper handling requires nitrile gloves and protective eyewear due to potential skin and eye irritation. The powder form presents inhalation risks, necessitating fume hood use during weighing operations. Long-term storage stability is best maintained in amber glass containers under inert atmosphere at temperatures below 25°C. Compatibility testing should precede mixing with oxidizing agents or strong acids/bases. Spills should be contained with absorbent materials and disposed as hazardous organic waste.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering comprehensive analytical certificates including HPLC purity (≥98%), residual solvent analysis, and heavy metal content reports. Batch-to-batch consistency is critical for pharmaceutical applications. Minimum order quantities typically range from 100g to 1kg for standard purity grades. For custom synthesis projects, lead times of 4-8 weeks should be anticipated. Regulatory documentation packages should include REACH compliance statements and impurity profiles for GMP applications.
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