Cinnamic acid

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
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 organic compound with the formula C6H5-CH=CH-COOH. It is a white crystalline compound that is slightly 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]

  1. ^ "Cinnamic Acid" . Encyclopædia Britannica. Vol. 6 (11th ed.). 1911. p. 376.
  2. ^ "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. ^ Cite error: The named reference Merck was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Ullmann was invoked but never defined (see the help page).