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Phenolates

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(Redirected fromPhenolate)
Salts or other derivatives of phenols
Structural formula of the phenolate ion

Phenolates (also calledphenoxides) areanions,salts, and esters ofphenols, containing the phenolate ion. They may be formed by reaction of phenols with strong base.[1]

Properties

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Main article:sodium phenoxide

Alkali metal phenolates, such assodium phenolate hydrolyze in aqueous solution to form basic solutions.[2] At pH = 10, phenol and phenolate are in approximately 1:1 proportions.

The phenoxide anion (akaphenolate) is a strongnucleophile with a comparable to the one of carbanions or tertiary amines.[3] Generally, oxygen attack of phenoxide anions is kinetically favored, while carbon-attack is thermodynamically preferred (seeThermodynamic versus kinetic reaction control). Mixed oxygen/carbon attack and by this a loss of selectivity is usually observed if the reaction rate reaches diffusion control.[4]

Uses

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Alkyl aryl ethers can be synthesized through theWilliamson ether synthesis by treating sodium phenolate with analkyl halide:[5]

C6H5ONa + CH3I → C6H5OCH3 + NaI
C6H5ONa + (CH3O)2SO2 → C6H5OCH3 + (CH3O)SO3Na

Production of salicylic acid

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Salicylic acid is produced in theKolbe–Schmitt reaction between carbon dioxide and sodium phenolate.

See also

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References

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  1. ^Smith, Michael B.;March, Jerry (2007),Advanced Organic Chemistry: Reactions, Mechanisms, and Structure (6th ed.), New York: Wiley-Interscience, p. 506,ISBN 978-0-471-72091-1
  2. ^Jakubke, Hans-Dieter; Karcher, Ruth (1999).Lexikon der Chemie in drei Bänden, Band 3. Heidelberg: Spektrum Verlag. p. 14.ISBN 3-8274-0381-2.
  3. ^[1]. Mayr's Database of Reactivity Parameters. Retrieved July 10, 2019.
  4. ^Mayer, Robert J.; Breugst, Martin; Hampel, Nathalie; Ofial, Armin R.; Mayr, Herbert (2019-06-26). "Ambident Reactivity of Phenolate Anions Revisited: A Quantitative Approach to Phenolate Reactivities".Journal of Organic Chemistry.84 (14):8837–8858.doi:10.1021/acs.joc.9b01485.PMID 31241938.S2CID 195696760.
  5. ^Beyer, Hans; Walter, Wolfgang (1984).Organische Chemie. Stuttgart: S. Hirzel Verlag. pp. 463–464.ISBN 3-7776-0406-2.
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