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1,3-Diiodo-5,5-Dimethylhydantoin, DIH

DIH has a comparable reactivity to molecular iodine, but DIH is more convenient to handle, because the solid reagent does not sublimate. DIH is also an alternative to NIS (N-iodosuccinimide) for the iodination of arenes or enols.

Recent Literature

Various primary alcohols, and primary, secondary, and tertiary amines were efficiently converted into the corresponding nitriles in good yields by oxidation with 1,3-diiodo-5,5-dimethylhydantoin (DIH) in aqueous ammonia at 60 C.
S. Iida, H. Togo, Synlett, 2007, 407-410.

S. Iida, H. Togo, Synlett, 2007, 407-410.

Various alcohols were efficiently converted into the corresponding nitriles at room temperature by treatment with tert-butyl hypochlorite, diiodine, or 1,3-diiodo-5,5-dimethylhydantoin (DIH) in the presence of TEMPO, followed by treatment with diiodine and aqueous ammonia. The nitriles were obtained in good yields and high purities by a simple extraction of the reaction mixture with chloroform and subsequent removal of the solvent.
H. Shimojo, K. Moriyama, H. Togo, Synthesis, 2013, 45, 2155-2156.

Various aromatic and aliphatic aldehydes were converted into the corresponding 2-aryl and 2-alkyl-2-oxazolines, respectively, in good yields by reaction with 2-aminoethanol and 1,3-diiodo-5,5-dimethylhydantoin.
S. Takahashi, H. Togo, Synthesis, 2009, 2329-2332.

An organocatalytic iodination of activated aromatic compounds using 1,3-diiodo-5,5-dimethylhydantoin (DIH) as the iodine source with thiourea catalysts in acetonitrile is applicable to a number of aromatic substrates with significantly different steric and electronic properties. The iodination is generally highly regioselective and provides high yields of isolated products.
G. Jakab, A. Hosseini, H. Hausmann, P. R. Schreiner, Synthesis, 2013, 45, 1635-1640.