Fast Halogenation of Some N-Heterocycles by Means of N,N’-Dihalo-5,5-dimethylhydantoin was written by Sandtorv, Alexander H.;Bjorsvik, Hans-Rene. And the article was included in Advanced Synthesis & Catalysis in 2013.COA of Formula: C3H2I2N2 This article mentions the following:
An instantaneous, selective and high-yielding halogenation process is reported. The method operates with imidazoles, pyrazoles, and indoles under benign reaction conditions. The developed process involves the use of N,N’-dihalo-5,5-dimethylhydantoins (halo = chlorine, bromine, iodine) as halogenation reagents that are activated by catalytic quantities of a strong Bronsted acid. Moreover, the halogenation process is switchable to produce either the mono- or di-halogenated products. Issues related to the reaction mechanism are investigated and a proposal for a reaction mechanism is disclosed. In the experiment, the researchers used many compounds, for example, 4,5-Diiodo-1H-imidazole (cas: 15813-09-9COA of Formula: C3H2I2N2).
4,5-Diiodo-1H-imidazole (cas: 15813-09-9) belongs to iodide derivatives. In general, organic iodides are light-sensitive and turn yellow during storage, owing to the formation of iodine. Alkyl iodides react at a faster rate than alkyl fluorides due to the weak C-I bond.COA of Formula: C3H2I2N2
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com