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4-Chlorocinnamic acid

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 degrees Celsius(lit.)
Boiling point: 260.71 degrees Celsius (rough estimate)
Density: 1.2377 (rough estimate)
Refractive index: 1.5426 (estimate)
Storage conditions: Room temperature.
Acidity coefficient (pKa): 4.41(at 25 degrees Celsius)
Appearance: white crystal powder, it can be solved in ethanol, ethyl acetate and other organic solvent.
Purity: 99% Min

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Preparation


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 degrees Celsius 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%.


Application:


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


Safety


It is slightly harmful to water. Do not let undiluted or large quantities of products come into contact with ground water, waterways or sewage systems. If there is no government permission, do not discharge materials into the surrounding environment. Stable under normal temperature and pressure to avoid oxide contact.


Storage


Keep the container sealed and store in a cool, dry place.

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