1,3-Dichloro-5,5-dimethylhydantoin

1,3-Dichloro-5,5-dimethylhydantoin (DCDMH, CAS No. 118-52-5) 

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1. Basic Information

IUPAC Name: 1,3-Dichloro-5,5-dimethylimidazolidine-2,4-dioneSynonyms:DCDMHHalane® (commercial name)CAS Number: 118-52-5Molecular Formula: C₅H₆Cl₂N₂O₂Molecular Weight: 197.02 g/molAppearance: White crystalline powderOdor: Strong chlorine-like odor

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2. Physical and Chemical Properties

Property	Value
Melting Point	132–135°C (270–275°F)
Solubility (25°C)	– Water: 0.2 g/100 mL
	– Organic solvents: Soluble in acetone, chloroform
Active Chlorine	56–60% (theoretical: 72%)
pH (1% solution)	3.0–5.0 (acidic)

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3. Chemical Structure

       Cl         |    O=C-N-CH₃     |   |    N   C=O     |   |    CH₃ Cl

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4. Hazards (GHS Classification)

Oxidizing Properties: May intensify fire (H272)Acute Toxicity:Harmful if swallowed (H302)Causes severe skin burns (H314)Environmental: Very toxic to aquatic life (H400)NFPA Rating: Health 3, Flammability 0, Reactivity 2 (Oxidizer)

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5. Storage and Handling

Storage:Keep in original containers away from heat/flamesStore separately from acids, ammonia, and reducing agentsHandling:Use chemical-resistant gloves (neoprene/Viton®) + face shieldWork in well-ventilated areas

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6. Applications

Water Treatment:Slow-release disinfectant for swimming poolsBleaching Agent:Textile and pulp bleachingOrganic Synthesis:Chlorinating agent for pharmaceuticals

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