Truxillic acid

Chemical compound From Wikipedia, the free encyclopedia

Truxillic acids are any of several crystalline stereoisomeric cyclic dicarboxylic acids with the formula (C6H5C2H2(CO2H)2. They are colorless solids. These compounds are obtained by the [2 + 2] photocycloadditions of cinnamic acid where the two trans alkenes react head-to-tail. The isolated stereoisomers are called truxillic acids.[1] The preparation of truxillic acids provided an early example of organic photochemistry.[2]

Cinnamic Acid CycloAddition
Cinnamic Acid CycloAddition
Quick facts Names, Identifiers ...
Truxillic acid
Names
IUPAC name
7,8′-Cyclo-8,7′-neolignane-9,9′-dioic acid
Systematic IUPAC name
2,4-Diphenylcyclobutane-1,3-dicarboxylic acid
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.022.478 Edit this at Wikidata
EC Number
  • 224-724-3
UNII
  • InChI=1S/C18H16O4/c19-17(20)15-13(11-7-3-1-4-8-11)16(18(21)22)14(15)12-9-5-2-6-10-12/h1-10,13-16H,(H,19,20)(H,21,22)
    Key: QWFRRFLKWRIKSZ-UHFFFAOYSA-N
  • OC(C1C(C2=CC=CC=C2)C(C(O)=O)C1C3=CC=CC=C3)=O
Properties
C18H16O4
Molar mass 296.322 g·mol−1
Hazards
GHS labelling:
GHS06: Toxic
Danger
H301, H315, H319, H335
P261, P264, P264+P265, P270, P271, P280, P301+P316, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Occurrence and reactions

These compounds are found in a variety of plants, for example in coca.[3][4] Incarvillateine, an alkaloid from the plant Incarvillea sinensis, is a derivative of α-truxillic acid.

Upon heating, truxillic acids undergo cracking to give cinnamic acid.[5]

Isomers

Truxillic acid can exist in five stereoisomers.[6][7]

More information Isomer, a ...
Truxillic acid isomers
Isomer a b c d e f
α-truxillic acid
(cocaic acid[8])		COOHHHC6H5HCOOH
γ-truxillic acidCOOHHHC6H5COOHH
ε-truxillic acidHCOOHC6H5HHCOOH
peri-truxillic acidCOOHHC6H5HCOOHH
epi-truxillic acidCOOHHC6H5HHCOOH
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Below are the five stereoisomers of truxillic acid, called alpha, gamma, epsilon, peri, and epi. These are shown both in a 2D skeletal diagram with stereocenters indicated and a 3D rendering of the structural geometry of the isomers themselves.

See also

  • Truxinic acids are isomers of the truxillic acids with phenyl groups on adjacent methyne centers.

References

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