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4-Chlorocinnamic acid

4-Chlorocinnamic acid is obtained by reacting p-chlorobenzaldehyde with acetic anhydride. The p-chlorobenzaldehyde, acetic anhydride and sodium acetate were reacted together at 180 ° C for 13 h. After the reaction, it was slightly cold, poured into water, filtered, and the filter cake was washed with water and repeatedly dissolved with ammonia water until only a small amount of brownish yellow viscous remained. The obtained ammonium salt solution was filtered, and p-chlorocinnamic acid was re-precipitated with 3N dilute sulfuric acid, and dried by filtration to obtain a product. The yield is about 80%.


Chemical Name: 4-Chlorocinnamic acid

Synonyms: p-Chlorocinnamic acid; 3-(4-chlorophenyl)acrylic acid; trans-4-Chlorocinnamic acid; trans-3-(4-Chlorophenyl)propenoic acid; Cinnamic acid, p-chloro-

CAS NO.: 1615-02-7

Molecular Formula: C9H7ClO2

Molecular Weight: 182.61

Melt point: 248-250 °C(lit.)

Boiling point: 260.71°C (rough estimate)

Density: 1.2377 (rough estimate)

Refractive index: 1.5426 (estimate)

Storage conditions: Room temperature.

Acidity coefficient (pKa): 4.41(at 25℃)

Appearance: white crystal powder, it can be solved in ethanol, ethyl acetate and other organic solvent.

Purity: 99% Min


An organic synthesis intermediate for the synthesis of p-chloropropionic acid to produce a herbicide, Mai Di San. For the synthesis of herbicides.