1,2-Benzisothiazol-3(2H)-one
Also known as: 1,2-Benzisothiazolin-3-one, Benzisothiazolone, BIT, Proxel, Proxan, 1,2-Benzothiazol-3(2H)-one, Benzo[d]isothiazol-3(2H)-one, 1,2-Benzisothiazol-3-ol, Benzocil, Acticide BIT
1,2-Benzisothiazol-3(2H)-one (CAS 2634-33-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C7H5NOS and a molecular weight of 151.19 g/mol. Key properties include a melting point of 154-158ºC, a boiling point of 204.5±23.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 77.5±22.6 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 2634-33-5
- Jingsj CID
- J-1013322-2
- Molecular Formula
- C7H5NOS
- Molecular Weight
- 151.19 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 154-158ºC |
|---|---|
| Boiling Point | 204.5±23.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 77.5±22.6 °C |
| Exact Mass | 151.009186 |
| PSA | 61.10000 |
| LogP | 1.78 |
| Vapor Pressure | 0.2±0.4 mmHg at 25°C |
| Refractive Index | 1.745 |
| Additional Property | Soluble in dichloromethane, dimethyl sulfoxide, methanol. |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H317 — May cause an allergic skin reaction
- H318 — Causes serious eye damage
- H400 — Very toxic to aquatic life
Activity & Biological Data
| Additional Information | [1]. CollierPJ, et al. Growth inhibitory and biocidal activity of some isothiazolonebiocides. J Appl Bacteriol. 1990 Oct;69(4):569-77. |
|---|
Customs & Trade Information
| HS Code | 2934999090 |
|---|---|
| Summary | 2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 1,2-Benzisothiazol-3(2H)-one?
The CAS number of 1,2-Benzisothiazol-3(2H)-one is 2634-33-5.
What are the molecular formula and molecular weight of 1,2-Benzisothiazol-3(2H)-one?
1,2-Benzisothiazol-3(2H)-one has molecular formula C7H5NOS and molecular weight 151.19 g/mol.
Is 1,2-Benzisothiazol-3(2H)-one hazardous?
1,2-Benzisothiazol-3(2H)-one has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of 1,2-Benzisothiazol-3(2H)-one?
For 1,2-Benzisothiazol-3(2H)-one, Upstream Products: 2-Chlorobenzonitrile, 2-(methylthio)benzonitrile, 2,2'-dithiobisbenzamide; Downstream Products: 2,2'-dithiobisbenzamide, 3-(1-Piperazinyl)-1,2-benzisothiazole, 3-Chloro-1,2-benzisothiazole.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1,2-Benzisothiazol-3(2H)-one (CAS 2634-33-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1013322-2 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.