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Iodosobenzene is used as an oxidizing and acetoxylating agent in organic synthesis. It is actively involved in the preparation of (Z)-3,7-dimethyl-2,6-octadien-1-al(neral) from (Z)-3,7-dimethyl-2,6-octadien-1-ol (nerol) in presence of 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO). It is a useful reagent for the synthesis of a wide variety of heterocyclic compounds. It is also used in the Pd-catalyzed 2-arylation of indoles.
Versatile oxidizing and acetoxylating agent.
For a review of the ɑ-functionalization of carbonyl compounds by hypervalent iodine reagents, see: Contemp. Org. Synth., 2, 121 (1995).
Hydrazine hydrate is oxidized to the useful cis-reducing agent diimide: Synth. Commun., 17, 703 (1987).
Converts primary aliphatic amides to amines, by Hofmann degradation: J. Org. Chem., 44, 1746 (1979); Synthesis, 266 (1981); 31 (1983). For use in the synthesis of ß-alanine derivatives, see: J. Org. Chem., 62, 6918 (1997); for reaction scheme, see N(ɑ)-Benzyloxycarbonyl-L-asparagine, L08592.
In the presence of triethyl orthoformate, aryl ethyl ketones undergo a rearrangement to ɑ-methyl arylacetates: Synthesis, 231 (1984):
Similarly, in the presence of an orthoformate and sulfuric acid, flavanones undergo a 1,2-aryl shift to give 2-aryl-2,3-dihydrobenzofuran-3-carboxylates: Bull. Chem. Soc. Jpn., 68, 1168 (1995). However, iodosobenzene diacetate alone oxidizes flavanones to flavones: J. Chem. Res. (Synop.), 213 (1995). For a review of the use of the reagent in heterocyclic synthesis, see: Synlett, 221 (1994).
Useful reagent for mild, rapid cleavage of 1,3-dithianes to the parent carbonyl compounds: Syn. Commun., 30, 4081 (2000).
In combination with iodine, forms the acyl hypoiodite, which adds to alkenes: Bull. Chem. Soc. Jpn., 41, 1476 (1968), iodinates alkylbenzenes: J. Am. Chem. Soc., 90, 6187 (1968), and effects the decarboxylative iodination of aromatic carboxylic acids: Synth. Commun., 18, 1327 (1988).
See cis,cis-1,5-Cyclooctadiene, B21196, for an intramolecular cyclization reaction.
For use in the Pd(II)-catalyzed functionalization of sp2 and sp3 C-H bonds, see: J. Am. Chem. Soc., 126, 2300 (2004).
Treatment with aqueous NaOH gives the useful selective oxidant iodosobenzene (iodosylbenzene): Org. Synth. Coll., 5, 658 (1973).
For a brief feature on uses of the reagent in synthesis, see: Synlett, 657 (2006). For reviews of the use of polyvalent iodine compounds in organic synthesis, see: Synthesis, 709 (1984); Acc. Chem. Res., 19, 244 (1986); Chem. Rev., 96, 1123 (1996). For a monograph, see: A Varvoglis, The Organic Chemistry of Polycoordinated Iodine, VCH, N.Y. (1992).
Wu, J.; Hoang, K. L. M.; Leow, M. L.; Liu, X. W. Pd-catalyzed cross-coupling of aromatic compounds with carboxylic acids via C-H bond activation. Org. Chem. Front. 2015, 2 (5), 502-505.
Ghosh, S.; Chaudhuri, S.; Bisai, A. Oxidative Dimerization of 2-Oxindoles Promoted by KO t Bu-I2: Total Synthesis of (±)-Folicanthine. Org. Lett. 2015, 17 (6), 1373-1376.
Hazard Statements: H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P280a-P305+P351+P338-P304+P340-P405-P501a
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.