A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
The Allan–Robinson reaction is the chemical reaction of o-hydroxyaryl ketones with aromatic anhydrides to form flavones (or isoflavones).[1][2][3][4]
If aliphatic anhydrides are used, coumarins can also be formed. (See Kostanecki acylation.)
Mechanism
The o-hydroxyaryl ketone first undergoes tautomerization to form the respective enol. The pi electrons of the double bond then attack the electrophilic carbon of the anhydride; a carboxylate anion is subsequently lost as a leaving group. The carboxylate anion then attacks an alpha hydrogen to form an enol. The nucleophilic hydroxyl group then attacks the carbonyl carbon to form a six-membered heterocyclic ring. A proton is abstracted from the hydroxyl group of the enol to form a ketone, and the remaining hydroxyl group is lost as a leaving group in a concerted step to afford the final product.[4][5]
See also
References
- ^ Allan, J.; Robinson, R. J. Chem. Soc. 1924, 125, 2192.
- ^ Dyke, S. F.; Ollis, W. D.; Sainsbury, M. J. Org. Chem. 1961, 26, 2453. (doi:10.1021/jo01351a072)
- ^ Wheller, T. S. (1952). "Flavone". Organic Syntheses. 32: 72. doi:10.15227/orgsyn.032.0072.
- ^ a b Jie Jack Li (2009). Name Reactions. A Collection of Detailed Reaction Mechanisms 4th Edition. Berlin, De: Springer. ISBN 978-3-642-01052-1.
- ^ Graham, Solomons, T. W. (17 January 2013). Organic chemistry. Fryhle, Craig B.,, Snyder, S. A. (Scott A.) (11e ed.). Hoboken, NJ. ISBN 9781118147399. OCLC 820665397.
{{cite book}}
: CS1 maint: location missing publisher (link) CS1 maint: multiple names: authors list (link)
Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.
Antropológia
Aplikované vedy
Bibliometria
Dejiny vedy
Encyklopédie
Filozofia vedy
Forenzné vedy
Humanitné vedy
Knižničná veda
Kryogenika
Kryptológia
Kulturológia
Literárna veda
Medzidisciplinárne oblasti
Metódy kvantitatívnej analýzy
Metavedy
Metodika
Text je dostupný za podmienok Creative
Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších
podmienok.
Podrobnejšie informácie nájdete na stránke Podmienky
použitia.
www.astronomia.sk | www.biologia.sk | www.botanika.sk | www.dejiny.sk | www.economy.sk | www.elektrotechnika.sk | www.estetika.sk | www.farmakologia.sk | www.filozofia.sk | Fyzika | www.futurologia.sk | www.genetika.sk | www.chemia.sk | www.lingvistika.sk | www.politologia.sk | www.psychologia.sk | www.sexuologia.sk | www.sociologia.sk | www.veda.sk I www.zoologia.sk