4-Chloro-3-methylisothiazole CAS 930-43-8

Purity 97%+In StockPharmaceutical Standards
CAS No.930-43-8
Molecular FormulaC4H4ClNS
Molecular Weight133.60 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

4-Chloro-3-methylisothiazole CAS 930-43-8 chemical structure

Description

4-Chloro-3-methylisothiazole (CAS 930-43-8), molecular formula C4H4ClNS and molecular weight 133.60 g/mol, is a CATO reference standard with documented purity and traceability.

Structurally, 4-Chloro-3-methylisothiazole (C4H4ClNS) contains a nitrile group, sulfur-containing functionality, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 133.60 g/mol, it falls into the low-molecular-weight range. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

As a certified reference material (CRM), 4-Chloro-3-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.

Physical & Chemical Properties

Molecular FormulaC4H4ClNS
Molecular Weight133.60 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light, keep tightly closed to prevent evaporation
Solubility (reference)Soluble in methanol, acetonitrile, DMSO
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)3.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1957
Halogen ContentCl-containing
Nitrogen Atoms1
Sulfur Atoms1

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