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IUPAC name 3-bromo-1-chloro-5,5-dimethyl


Other names bromochloro-5,5-dimethylhydantoin, BCDMH, agribrom, aquabrom, aquabrome, bromicide, di-halo, halogene T30, nylate, photobrome, slimicide 78P
CAS number 126-06-7
Molecular formula C5H6BrClN2O2
Molar mass 241.49 g/mol
Appearance White solid
Density 1.9 g/cm3
Melting point

158 °C - 165 °C

Solubility in water 0.25 g/100 ml (25 °C)
MSDS External MSDS
Main hazards Flamability, Inhalation
NFPA 704
R/S statement S8, S17, S26, S36, S37, S39, S41, S45
Flash point Decomposes at 160°C
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

1-Bromo-3-chloro-5,5-dimethylhydantoin (BCDMH) is a chemical structurally related to hydantoin. It is a white crystalline compound with a slight bromine and acetone odor and is insoluble in water, but soluble in acetone.

BCDMH is an excellent source of both chlorine and bromine as it reacts slowly with water releasing hypochlorous acid and hypobromous acid. It used as a chemical disinfectant used for recreational water and drinking water purification. BCDMH works in the following manner:

The initial BCDMH reacts with water (R = Dimethylhydantoin):

BrClR + 2 H2O → HOBr + HOCl + RH2

Hypobromous acid partially dissociates in water:

HOBr → H+ + OBr-

Hypobromous acid oxidizes the substrate, itself being reduced to bromide:

HOBr + Live pathogens → Br- + Dead pathogens

The bromide ions are oxidized with the hypochlorous acid that was formed from the initial BCDMH:

Br- + HOCl → HOBr + Cl-

This produces more hypobromous acid. However, it should be noted that the hypochlorous acid itself does act directly as a disinfectant in the process.


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    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "BCDMH". A list of authors is available in Wikipedia.
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