5-chloro-2-methyl-3-Isothiazolone (MCI, cas 26172-55-4) is an isothiazolinone-derived biocide used for controlling microbial growth in water-containing solutions. It is effective against Gram-positive and Gram-negative bacteria, yeast, and fungi. This preservative is known as Kathon™ when used at a 3:1 ratio with methylisothiazolinone (MI). Recent reports have shown both MCI/MI and MI by itself can elicit contact sensitization.
| Catalog Number | R046035 |
| CAS Number | 26172-55-4 |
| Synonyms | 5-Chloro-2-methyl-3(2H)-isothiazolone; 2-Methyl-5-chloro-3-isothiazolone; 2-Methyl-5-chloroisothiazolin-3-one; A 33; Bioace; HS 818; Kathon CG 5243; Kathon IXE; Methylchloroisothiazolinone; |
| Molecular Formula | C4H4ClNOS |
| Purity | 95% |
| Storage | -20°C |
| Related CAS | 137086-87-4 |
| IUPAC Name | 5-chloro-2-methyl-1,2-thiazol-3-one |
| InChI | InChI=1S/C4H4ClNOS/c1-6-4(7)2-3(5)8-6/h2H,1H3 |
| InChIKey | DHNRXBZYEKSXIM-UHFFFAOYSA-N |
| SMILES | CN1C(=O)C=C(S1)Cl |
