Cinnamic acid

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Cinnamic acid
Skeletal formula of trans-cinnamic acid
Ball-and-stick model of the trans-cinnamic acid molecule
Sample of the compound cinnamic acid in powder form
Names
Preferred IUPAC name
(2E)-3-Phenylprop-2-enoic acid
Systematic IUPAC name
Cinnamic acid
Other names
trans-Cinnamic acid
Phenylacrylic acid[1]
Cinnamylic acid
3-Phenylacrylic acid
(E)-Cinnamic acid
Benzenepropenoic acid
Isocinnamic acid
Identifiers
3D model (
JSmol
)
3DMet
1905952
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard
 100.004.908 Edit this at Wikidata
EC Number
  • 205-398-1
3731
IUPHAR/BPS
KEGG
UNII
  • InChI=1S/C9H8O2/c10-9(11)7-6-8-4-2-1-3-5-8/h1-7H,(H,10,11)/b7-6+ checkY
    Key: WBYWAXJHAXSJNI-VOTSOKGWSA-N checkY
  • InChI=1/C9H8O2/c10-9(11)7-6-8-4-2-1-3-5-8/h1-7H,(H,10,11)/b7-6+
    Key: WBYWAXJHAXSJNI-VOTSOKGWBT
  • O=C(O)\C=C\c1ccccc1
Properties
C9H8O2
Molar mass 148.161 g·mol−1
Appearance White monoclinic crystals
Odor Honey-like[2]
Density 1.2475 g/cm3[3]
Melting point 133 °C (271 °F; 406 K)[3]
Boiling point 300 °C (572 °F; 573 K)[3]
500 mg/L[3]
Acidity (pKa) 4.44
−7.836×10−5 cm3/mol
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335
P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
1
0
Flash point > 100 °C (212 °F; 373 K)[3]
Related compounds
Related compounds
 Benzoic acid, Phenylacetic acid, Phenylpropanoic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Cinnamic acid is an

soluble in water, and freely soluble in many organic solvents.[4] Classified as an unsaturated carboxylic acid, it occurs naturally in a number of plants. It exists as both a cis and a trans isomer, although the latter is more common.[5]

Occurrence and production

Biosynthesis

Cinnamic acid is a central intermediate in the biosynthesis of a myriad of natural products including lignols (precursors to

stilbenes, catechin, and phenylpropanoids. Its biosynthesis involves the action of the enzyme phenylalanine ammonia-lyase (PAL) on phenylalanine.[6]

Natural occurrence

It is obtained from oil of

storax.[4] It is also found in shea butter.[citation needed] Cinnamic acid has a honey-like odor;[2] and its more volatile ethyl ester, ethyl cinnamate, is a flavor component in the essential oil of cinnamon, in which related cinnamaldehyde is the major constituent. It is also found in wood from all species of trees.[7]

Synthesis

Cinnamic acid was first synthesized by the base-catalysed condensation of

acid chloride product.[5] In 1890, Rainer Ludwig Claisen described the synthesis of ethyl cinnamate via the reaction of ethyl acetate with benzaldehyde in the presence of sodium as base.[8] Another way of preparing cinnamic acid is by the Knoevenagel condensation reaction.[9] The reactants for this are benzaldehyde and malonic acid in the presence of a weak base, followed by acid-catalyzed decarboxylation. It can also be prepared by oxidation of cinnamaldehyde, condensation of benzal chloride and sodium acetate (followed by acid hydrolysis), and the Perkin reaction. The oldest commercially used route to cinnamic acid involves the Perkin reaction, which is given in the following scheme[5]

Synthesis of cinnamic acid via the Perkin reaction.[10]

Metabolism

Cinnamic acid, obtained from autoxidation of cinnamaldehyde, is metabolized into sodium benzoate in the liver.[11]

Uses

Cinnamic acid is used in flavorings,

dimerize in non-polar solvents resulting in different linear free energy relationships.[12]

References

  1. ^ "Cinnamic Acid" . Encyclopædia Britannica. Vol. 6 (11th ed.). 1911. p. 376.
  2. ^ a b "Cinnamic acid". flavornet.org.
  3. ^ a b c d e Record in the GESTIS Substance Database of the Institute for Occupational Safety and Health
  4. ^
    ISBN 0911910123
  5. ^
    ISBN 978-3527306732
    .
  6. PMID 20035037
    .
  7. ^ Oldach, Laurel (February 22, 2023). "Forensic researchers use mass spectrometry to identify smuggled wood". Chemical and Engineering News. American Chemical Society.
  8. doi:10.1002/cber.189002301156
    .
  9. ^ Tieze, L. (1988). Reactions and Synthesis in the Organic Chemistry Laboratory. Mill Vall, CA. p. 1988.{{cite book}}: CS1 maint: location missing publisher (link)
  10. doi:10.15227/orgsyn.005.0083
    .
  11. PMID 23475543
    .
  12. PMID 25798191
    .
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