5-Methylisothiazole CAS 693-97-0
| CAS No. | 693-97-0 |
| Molecular Formula | C4H5NS |
| Molecular Weight | 99.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 5-Methylisothiazole meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
5-Methylisothiazole (CAS 693-97-0), molecular formula C4H5NS and molecular weight 99.15 g/mol, is a CATO reference standard with documented purity and traceability.
5-Methylisothiazole (C4H5NS) contains a nitrile group, sulfur-containing functionality. Its physicochemical properties are representative of its class; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
Physical & Chemical Properties
| Molecular Formula | C4H5NS |
| Molecular Weight | 99.15 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Methylisothiazole Standards
- 3-Methylisothiazole (CAS 693-92-5)
- 3-Methylisothiazole-4-carbonitrile (CAS 58850-81-0)
- 3-Methylisothiazole-5-carbonitrile (CAS 57352-00-8)
- 5-Methylisothiazole-3-carbonitrile (CAS 65735-08-2)
- 5-Methylisothiazole-4-carbaldehyde (CAS 1083223-98-6)
- 5-Methylisothiazole-3-carbaldehyde (CAS 1083274-36-5)
- 4-Methylisothiazole-3-carbaldehyde (CAS 1083401-28-8)
- 3-Methylisothiazole-4-carbaldehyde (CAS 17265-59-7)
Recommended Standards
- 4-Methyl-1,2-thiazole (CAS 693-90-3)
- Thiophen-2(3H)-imine (CAS 82357-68-4)
- 2-Methylthiazole (CAS 3581-87-1)
- 3-Aminothiophene (CAS 17721-06-1)
- Benzyl 3-chlorophenyl ether (CAS 24318-02-3)
- (4-Methoxy-[1,1'-biphenyl]-3-yl)hydrazine (CAS 149878-66-0)
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