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Anthrone

Anthrone
Skeletal formula
Ball-and-stick model
Names
Preferred IUPAC name
Anthracen-9(10H)-one
Other names
  • Carbothrone
  • 9-Oxoanthracene
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.813 Edit this at Wikidata
UNII
  • InChI=1S/C14H10O/c15-14-12-7-3-1-5-10(12)9-11-6-2-4-8-13(11)14/h1-8H,9H2 checkY
    Key: RJGDLRCDCYRQOQ-UHFFFAOYSA-N checkY
  • InChI=1/C14H10O/c15-14-12-7-3-1-5-10(12)9-11-6-2-4-8-13(11)14/h1-8H,9H2
    Key: RJGDLRCDCYRQOQ-UHFFFAOYAA
  • O=C2c1c(cccc1)Cc3c2cccc3
Properties
C14H10O
Molar mass 194.233 g·mol−1
Appearance White to light yellow needles
Melting point 155 to 158 °C (311 to 316 °F; 428 to 431 K)
Insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Anthrone is a tricyclic aromatic ketone. It is used for a common cellulose assay and in the colorimetric determination of carbohydrates.[1]

Derivatives of anthrone are used in pharmacy as laxative. They stimulate the motion of the colon and reduce water reabsorption. Some anthrone derivatives can be extracted from a variety of plants, including Rhamnus frangula, Aloe ferox, Rheum officinale, and Cassia senna.[2] Glycosides of anthrone are also found in high amounts in rhubarb leaves, and alongside concentrated amounts of oxalic acid are the reason for the leaves being inedible.

Synthesis and reactions

Anthrone can be prepared from anthraquinone by reduction with tin or copper.[3]

An alternative synthesis involves cyclization of o-benzylbenzoic acid induced with hydrogen fluoride.[4]

Anthrone syntheses

Anthrone condenses with glyoxal to give, following dehydrogenation, acedianthrone, a useful octacyclic pigment.[5]

Tautomer

Tautomeric equilibrium for anthrone.

Anthrone is the more stable tautomer relative to the anthrol. The tautomeric equilibrium is estimated at 100 in aqueous solution. For the two other isomeric anthrols, the tautomeric equilibrium is reversed.[6]

References

  1. ^ Trevelyan, W. E.; Forrest, RS; Harrison, JS (1952). "Determination of Yeast Carbohydrates with the Anthrone Reagent". Nature. 170 (4328): 626–627. Bibcode:1952Natur.170..626T. doi:10.1038/170626a0. PMID 13002392. S2CID 4184596.
  2. ^ Niaz, Kamal; Khan, Fazlullah (2020-01-01), Sanches Silva, Ana; Nabavi, Seyed Fazel; Saeedi, Mina; Nabavi, Seyed Mohammad (eds.), "Chapter 3 - Analysis of polyphenolics", Recent Advances in Natural Products Analysis, Elsevier, pp. 39–197, doi:10.1016/b978-0-12-816455-6.00003-2, ISBN 978-0-12-816455-6, retrieved 2024-06-01
  3. ^ Macleod, L. C.; Allen, C. F. H. (1934). "Benzanthrone". Organic Syntheses. 14: 4. doi:10.15227/orgsyn.014.0004.
  4. ^ Fieser, Louis F.; Hershberg, E. B. (May 1939). "Inter- and Intramolecular Acylations with Hydrogen Fluoride". Journal of the American Chemical Society. 61 (5): 1272–1281. doi:10.1021/ja01874a079.
  5. ^ Bien, H.-S.; Stawitz, J.; Wunderlich, K. (2005). "Anthraquinone Dyes and Intermediates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a02_355. ISBN 978-3527306732.
  6. ^ Ośmiałowski, Borys; Raczyńska, Ewa D.; Krygowski, Tadeusz M. (2006). "Tautomeric Equilibria and Pi Electron Delocalization for Some Monohydroxyarenes Quantum Chemical Studies". The Journal of Organic Chemistry. 71 (10): 3727–3736. doi:10.1021/jo052615q. PMID 16674042.
Quelle: http://en.wikipedia.org/wiki/Anthrone