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Description
TCI D3657 1,3-Diiodo-5,5-dimethylhydantoin is a solid heterocyclic reagent that acts as a source of electrophilic iodine. Its structure is built on a hydantoin framework carrying two iodine atoms bonded to the two ring nitrogens. In the laboratory it is used as an iodinating reagent and a mild oxidant, offering a more convenient and easier-to-handle alternative to molecular iodine or to reagent mixtures that must be prepared in situ. Its characteristic role is the introduction of iodine atoms into aromatic compounds, alkenes, and activated carbonyl compounds, while generating a hydantoin by-product that is relatively straightforward to separate from the reaction mixture.
The properties that make this reagent a preferred choice are its stable solid form and its double content of active iodine per molecule. Because it is a solid, the reagent can be weighed out stoichiometrically with ease, so the amount of electrophilic iodine delivered to a reaction can be controlled far more precisely than when working with iodine solutions. Its reactivity can also be tuned through the choice of solvent and through the addition of acid as an activator, giving the chemist the freedom to adjust how aggressive the reaction is toward sensitive substrates. Beyond iodination, the N-halohydantoin framework itself contributes to its usefulness as a halogen-transfer reagent.
In Indonesian laboratories, this reagent is typically used in synthetic organic chemistry work at universities, research institutes, and industrial R&D units where halogenated intermediates are prepared. It suits settings that value a bench-stable solid over solution-based iodine handling, particularly where reagents must be stored and dispensed under routine tropical laboratory conditions. Its role as a heterocyclic building block also makes it relevant to groups preparing intermediates for further coupling and functionalisation studies.
Laboratory Applications
Aromatic iodination — the reagent delivers electrophilic iodine directly to aromatic rings, and its solid form allows accurate stoichiometric control over the degree of substitution achieved.
Alkene functionalisation — iodine is transferred across carbon–carbon double bonds, with solvent choice and acid activation used to moderate reactivity toward substrates that are sensitive to harsher conditions.
Alpha-iodination of activated carbonyl compounds — the reagent introduces iodine adjacent to activated carbonyl centres, producing intermediates useful for subsequent substitution and coupling chemistry.
Mild oxidation reactions — the N-halohydantoin framework acts as a mild oxidant, providing a controlled alternative to reagent mixtures that would otherwise need to be generated in situ.
Heterocyclic building block synthesis — as a hydantoin-based scaffold, it serves preparative work where halogenated heterocyclic intermediates are required for further elaboration into larger target molecules.
Specifications
Brand: TCI
CAS number: 2232-12-4
Category: Chemistry > Building Blocks > Heterocyclic Building Blocks
Pack sizes: available in standard TCI catalogue pack sizes; please confirm the required size when ordering
Physical form: solid reagent
Storage note: store in a closed container in a cool, dry place away from light and heat
Handling and Storage
Store the reagent in its original tightly closed container in a cool, dry, well-ventilated place, protected from direct sunlight, heat sources, and moisture. Amber or opaque containers with chemically resistant closures are appropriate, and the container should be resealed promptly after each weighing to limit exposure to humid air. Handle the solid inside a fume hood, using safety glasses, gloves, and a laboratory coat, and avoid generating dust during transfer or weighing. Keep the reagent separate from incompatible materials such as strong reducing agents, and clean spatulas and glassware thoroughly after use. Follow the manufacturer's safety data sheet and your institution's chemical handling procedures for disposal of residues and contaminated materials.
