Fremy's Salt
Title: Fremy's Salt
CAS Registry Number: 14293-70-0
CAS Name: Nitrosodisulfonic acid dipotassium salt
Additional Names: potassium nitrosodisulfonate; potassium peroxylaminedisulfonate
Molecular Formula: K2NO7S2
Molecular Weight: 268.33
Percent Composition: K 29.14%, N 5.22%, O 41.74%, S 23.90%
Line Formula: K2[NO(SO3)2]
Literature References: Radical oxidizing agent. Prepn: E. Fremy, Ann. Chim. Phys. 15, 408 (1845). Structural studies: W. Moser, R. A. Howie, J. Chem. Soc. A 1968, 3039; R. A. Howie et al., ibid. 3043. Mechanism of oxidation: B. Giethlen, J. M. Schaus, Tetrahedron Lett. 38, 8483 (1997). Synthetic applications: H. J. Teuber, G. Jellinek, Naturwissenschaften 38, 259 (1951); H. Schlude, Tetrahedron 29, 4007 (1973); P. M. Deya et al., ibid. 43, 3523 (1987); G. A. Kraus, N. Selvakumar, Tetrahedron Lett. 40, 2039 (1999). EPR studies: B. L. Bales, Chem. Phys. Lett. 10, 361 (1971); M. T. Jones et al., J. Phys. Chem. 83, 1327 (1979); B. L. Bales et al., J. Magn. Reson. 118, 227 (1996). Photochemistry study: H. Kunkely et al., J. Photochem. Photobiol. A 112, 9 (1998). Review of oxidation chemistry: H. Zimmer et al., Chem. Rev. 71, 229-246 (1971).
Properties: Occurs in two distinct crystalline forms: as monoclinic yellow-orange needles, and as triclinic orange-brown rhombs. Absorption max (water): 248, 545 nm (e 1690, 21).
Absorption maximum: Absorption max (water): 248, 545 nm (e 1690, 21)
Use: Reagent for the oxidation of anilines and phenols to quinones. EPR standard.

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