Camphoric acid

Camphoric acid, C₁₀H₁₆O₄ or in Latin form Acidum camphoricum, is a white crystallisable substance obtained from the oxidation of camphor. It exists in three optically different forms; the dextrorotatory one is obtained by the oxidation of dextrorotatory camphor and is used in pharmaceuticals.

Camphoric acid

Names
IUPAC name (1R,3S)-1,2,2-trimethylcyclopentane-1,3-dicarboxylic acid
Identifiers
CAS Number	560-09-8 (1S,3R) 124-83-4 (+) i.e., (1R,3S) D-Camphoric acid
3D model (JSmol)	Interactive image Interactive image
ChEMBL	ChEMBL1205405
ChemSpider	20198
ECHA InfoCard	100.241.243
PubChem CID	21491
UNII	62F72U898F (1S,3R) W77RM1CSD5 (+) i.e., (1R,3S) D-Camphoric acid
CompTox Dashboard (EPA)	DTXSID80204569
InChI InChI=1S/C10H16O4/c1-9(2)6(7(11)12)4-5-10(9,3)8(13)14/h6H,4-5H2,1-3H3,(H,11,12)(H,13,14) Key: LSPHULWDVZXLIL-UHFFFAOYSA-N InChI=1/C10H16O4/c1-9(2)6(7(11)12)4-5-10(9,3)8(13)14/h6H,4-5H2,1-3H3,(H,11,12)(H,13,14)/t6-,10+/m0/s1 Key: LSPHULWDVZXLIL-QUBYGPBYBH InChI=1/C10H16O4/c1-9(2)6(7(11)12)4-5-10(9,3)8(13)14/h6H,4-5H2,1-3H3,(H,11,12)(H,13,14) Key: LSPHULWDVZXLIL-UHFFFAOYAD
SMILES O=C(O)[C@]1(CC[C@@H](C(=O)O)C1(C)C)C O=C(O)C1CCC(C(=O)O)(C)C1(C)C
Properties
Chemical formula	C10H16O4
Molar mass	200.234 g·mol^−1
Density	1.21 g/cm^3
Melting point	183–187 °C (361–369 °F; 456–460 K)
Magnetic susceptibility (χ)	-129.0·10^−6 cm^3/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

History

Acidum camphoricum was studied and isolated for the first time by French pharmacist Nicolas Vauquelin in the early 19th century but it wasn't until September 1874 that Dutch chemist Jacobus H. van 't Hoff proposed the first suggestion for its molecular structure and optical properties. Haller and Blanc synthesized camphor from camphoric acid. In 1904, Finnish chemist Gustav Komppa became the first to succeed in manufacturing synthetic camphoric acid from diethyl oxalate and 3,3-dimethylpentanoic acid, and thus proving the structure of camphor.

Chemical properties and isolation

Camphoric acid may be prepared by oxidising camphor with nitric acid.

References

• "Acidum camphoricum". British Pharmaceutical Codex. Retrieved September 4, 2005.
• "Camphoric acid". Science and Technology. Retrieved September 4, 2005.
• "Camphoric acid". Taiwan Tekho Camphor Co. Retrieved September 4, 2005.
• Jacobus Henricus van 't Hoff (1874). "A suggestion looking to the extension into space of the structural formulas at present used in chemistry. And a note upon the relation between the optical activity and the chemical constitution of organic compounds". Archives Neerlandaises des Sciences Exactes et Naturelles. 9: 445–454.