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Seleninic acid

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Not to be confused with selenenic acid.
File:Methaneseleninic acid 2.png
Chemical structure of methaneseleninic acid

A seleninic acid is an organoselenium compound and an oxoacid with the general formula RSeO2H, where R ≠ H. It is a member of the family of organoselenium oxoacids, which also includes selenenic acids and selenonic acids, which are RSeOH and RSeO3H, respectively. The parent member of this family of compounds is methaneseleninic acid (CH3SeO2H), also known as methylseleninic acid or "MSA".

Reactions and applications in synthesis

Seleninic acids (particularly areneseleninic acids) are useful catalysts for hydrogen peroxide epoxidations, Baeyer–Villiger oxidations, oxidations of thioethers, etc.; peroxyseleninic acids (RSe(O)OOH) are thought to be the active oxidants.[1][2][3]

Structure, bonding, properties

Methaneseleninic acid has been characterized by X-ray crystallography.[4] The configuration about the selenium atom is pyramidal, with Se-C = 1.925(8) Å, Se-O = 1.672(7) Å, Se-OH = 1.756(7) Å, the angle OSeO = 103.0(3)°, the angle HO-Se-C = 93.5(3)°, and the angle OSeC = 101.4(3)°. The structure is isomorphous to that of methanesulfinic acid [5]

Benzeneseleninic acid (C6H5SeO2H) had been previously characterized by X-ray methods[6] and its optical resolution reported.[7]

References

  1. ^ ten Brink, G.-J.; Fernandes, B. C. M.; van Vliet, M. C. A.; Arends, I. W. C. E.; Sheldon, R. A. "Selenium catalyzed oxidations with aqueous hydrogen peroxide. Part I. Epoxidation reactions in homogeneous solution." J. Chem. Soc., Perkin Trans., 1 2001, 224–228. doi:10.1039/b008198l
  2. ^ ten Brink, G.-J.; Vis, J.-M.; Arends, I. W. C. E.; Sheldon, R. A. "Selenium-Catalyzed Oxidations with Aqueous Hydrogen Peroxide. 2. Baeyer-Villiger Reactions in Homogeneous Solution." J. Org. Chem. 2001, 66, 2429–2433. doi:10.1021/jo0057710
  3. ^ Mercier, E. A.; Smith, C. D.; Parvez, M.; Back, T. G. "Cyclic Seleninate Esters as Catalysts for the Oxidation of Sulfides to Sulfoxides, Epoxidation of Alkenes, and Conversion of Enamines to α-Hydroxyketones." J. Org. Chem. 2012, 77, 3508–3517. doi:10.1021/jo300313v
  4. ^ Block, E.; Birringer, M.; Jiang, W.; Nakahodo, T.; Thompson, H. J.; Toscano, P. J.; Uzar, H.; Zhang, X.; Zhu, Z. "Allium chemistry: Synthesis, natural occurrence, biological activity, and chemistry of Se-alk(en)ylselenocysteines and their γ-glutamyl derivatives and oxidation products." J. Agric. Food Chem. 2001, 49, 458–470. doi:10.1021/jf001097b
  5. ^ Seff, K.; Heidner, E. G.; Meyers, M.; Trueblood, K. N. "The crystal and molecular structure of methanesulfinic acid." Acta Crystallographica Section B 1969, 25, 350–354.
  6. ^ J. H. Bryden, H.; McCullough, J. D. "The crystal structure of benzeneseleninic acid." Acta Crystallogr. 1954. 7, 833–838. doi:10.1107/S0365110X54002551
  7. ^ Toshio, S.; Watanabe, I.; Kamigata, N. "Optically active seleninic acids: optical resolution and stability." Angew. Chem., Int. Edn. 2001, 40, 2460–2462. doi:10.1002/1521-3773(20010702)40:13<2460::AID-ANIE2460>3.0.CO;2-Q


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