3-Methoxybenzo[d]isothiazole 1,1-dioxide CAS 18712-14-6
| CAS No. | 18712-14-6 |
| Molecular Formula | C8H7NO3S |
| Molecular Weight | 197.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-Methoxybenzo[d]isothiazole 1,1-dioxide (CAS 18712-14-6), molecular formula C8H7NO3S and molecular weight 197.21 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 3-Methoxybenzo[d]isothiazole 1,1-dioxide (C8H7NO3S) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C8H7NO3S |
| Molecular Weight | 197.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Methoxybenzo Standards
- 4-Methoxybenzo[d]thiazole-2-thiol (CAS 51793-98-7)
- 5-Methoxybenzo[d]thiazole-2(3H)-thione (CAS 55690-60-3)
- 6-Methoxybenzo[d]thiazole-2(3H)-thione (CAS 2182-73-2)
- 7-Methoxybenzo[d]thiazole-2-thiol (CAS 908355-82-8)
- 6-Methoxybenzo[b]thiophene 1,1-dioxide (CAS 98733-09-6)
- ((7-Methoxybenzo[d][1,3]dioxol-5-yl)methyl)hydrazine (CAS 887593-36-4)
- 6-Methoxybenzo[d][1,3]dioxole-4-carboxylic acid (CAS 401811-79-8)
- 7-Methoxybenzo[d][1,3]dioxole-5-carboxylic acid (CAS 526-34-1)
Recommended Standards
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- Ceftibuten Hydrate (CAS 118081-34-8)
- 3-Methyl-3-(3-methyl-[1,2,4]oxadiazol-5-yl)-piperidine hydrochloride (CAS 1361115-20-9)
- 2-(6-Chloro-[3,4'-bipyridin]-4-yl)acetic acid (CAS 1227579-94-3)
- L-4-Hydroxyphenyl-2,6-d2-alanine (CAS 57746-15-3)
- 3,4-Difluoro-4-(5,5-dimethyl-1,3-dioxan-2-yl)butyrophenone (CAS 898786-97-5)
- Flavaconitine (CAS 83145-43-1)
- 2-(6-Amino-1H-benzo[d][1,2,3]triazol-1-yl)propanoic acid (CAS 1526480-99-8)
- D-Tyr1-Tirzepatide (CAS CATO-CPTD788928)
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