Overview
Trans-3-Chlorocinnamic Acid is a chlorinated derivative of cinnamic acid with significant industrial importance. As a white crystalline organic compound, it features a chlorine atom at the 3-position of the phenyl ring in trans-configuration. This structural characteristic grants it unique reactivity patterns distinct from its non-chlorinated counterpart. The compound serves as a versatile building block in fine chemical synthesis, particularly valued for its photoreactive properties. Its production typically involves Perkin reaction or Knoevenagel condensation followed by selective chlorination. Commercial grades typically offer 95-99% purity, with pharmaceutical applications requiring the highest purity specifications.
Physical and Chemical Properties
The compound crystallizes in monoclinic system with characteristic melting point between 188-192°C. Its limited water solubility (approximately 0.5 g/L at 25°C) contrasts with good solubility in polar organic solvents like ethanol (50 g/L) and acetone (120 g/L). The chlorine substitution enhances its electrophilic character compared to unsubstituted cinnamic acid. Key chemical behaviors include typical carboxylic acid reactivity (esterification, amidation) and participation in photodimerization reactions under UV light. The trans-configuration remains stable under normal storage conditions but may isomerize under prolonged UV exposure or at elevated temperatures (>200°C).
Main Applications
In pharmaceutical manufacturing, this compound serves as a crucial intermediate for synthesizing chlorinated drug molecules, particularly in NSAIDs and antifungal agents. Its photoreactivity makes it valuable in UV-curable coatings and adhesives formulations where it functions as a crosslinking agent. The agrochemical industry utilizes it in producing chlorinated pesticide intermediates. Research applications include its use as a model compound in photochemistry studies and as a building block for liquid crystal materials. Emerging applications explore its potential in organic electronic materials due to its conjugated π-system.
Safety and Storage
As a moderately hazardous chemical, appropriate safety measures should include nitrile gloves, safety goggles, and fume hood use during handling. The powder may cause respiratory irritation if airborne, warranting dust masks during bulk operations. Spills should be contained with inert absorbents and disposed as hazardous waste. Proper storage requires amber glass or opaque HDPE containers in cool (15-25°C), ventilated areas separate from strong oxidizers. Shelf life typically exceeds 2 years when stored correctly. Thermal decomposition may release hydrogen chloride gas, necessitating avoidance of high-temperature environments.
B2B Procurement Guide
Industrial buyers should specify required purity (typically 97-99%), trans-isomer content (>98%), and residual solvent levels when sourcing. Pharmaceutical-grade material requires additional heavy metal and microbiological testing documentation. Standard packaging includes 25kg fiber drums with polyethylene liners or customized quantities for laboratory use. Leading manufacturers are concentrated in China, India, and Europe. Sample testing for conformity with COA specifications is recommended before bulk purchases. Minimum order quantities typically range from 1kg for lab-grade to 100kg for industrial quantities. Price negotiations become favorable for multi-ton annual contracts.
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