4,6-Dimethoxybenzo[d]isothiazole-3-carboxylic acid CAS 21544-87-6
| CAS No. | 21544-87-6 |
| Molecular Formula | C10H9NO4S |
| Molecular Weight | 239.25 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 4,6-Dimethoxybenzo[d]isothiazole-3-carboxylic acid (C10H9NO4S) contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 239.25 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
4,6-Dimethoxybenzo[d]isothiazole-3-carboxylic acid (CAS 21544-87-6), molecular formula C10H9NO4S and molecular weight 239.25 g/mol, is a CATO reference standard with documented purity and traceability.
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.
CATO manufactures 4,6-Dimethoxybenzo[d]isothiazole-3-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C10H9NO4S |
| Molecular Weight | 239.25 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) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Dimethoxybenzo Standards
- 1-(5,6-Dimethoxybenzo[b]thiophen-2-yl)ethan-1-one (CAS 108952-49-4)
- 5,7-Dimethoxybenzo[d]isothiazol-3(2H)-one 1,1-dioxide (CAS 64404-51-9)
- 1-(4,6-Dimethoxybenzo[d][1,3]dioxol-5-yl)ethanol (CAS 2169908-23-8)
- 4,5-Dimethoxybenzo[b]thiophene-2-carbohydrazide (CAS 1263206-36-5)
- Methyl 4,5-dimethoxybenzo[b]thiophene-2-carboxylate (CAS 1263209-72-8)
- 5,6-Dimethoxybenzo[b]thiophene-2-carbohydrazide (CAS 1263215-28-6)
- 4,6-Dimethoxybenzo[d][1,3]dioxole-5-carboxylic acid (CAS 68803-44-1)
- 6,7-Dimethoxybenzo[d][1,3]dioxole-5-carboxylic acid (CAS 22027-56-1)
Recommended Standards
- 3-Amino-4,6-dimethyl-7-oxo-6,7-dihydrothieno[2,3-d]pyridazine-2-carboxylic acid (CAS 2089315-35-3)
- 4-[(cyanomethanesulfonyl)methyl]benzoic acid (CAS 851468-10-5)
- 3-(Hydroxymethyl)-5-methyl-N-(thiazol-2-yl)isoxazole-4-carboxamide (CAS 338408-93-8)
- 4-[(prop-2-ynylamino)sulfonyl]benzoic acid (CAS 923248-74-2)
- Methyl 5,6,7,8-tetrahydropyrazolo[5,1-b][1,3]oxazepine-2-carboxylate (CAS 1935360-89-6)
- Terpin (CAS 565-48-0)
- tert-Butyl 3-(1-amino-2-(benzyloxy)ethyl)azetidine-1-carboxylate (CAS 2357739-59-2)
- Endosulfan-Lacton (CAS 3868-61-9)
- O4-tert-butyl O2-methyl (2S)-morpholine-2,4-dicarboxylate (CAS 1932484-68-8)
- Ethyl 2-(3-(benzylamino)oxetan-3-yl)acetate (CAS 1207175-55-0)
- 1-Benzyl-1H-benzo[d]imidazol-5-amine (CAS 26530-89-2)
- 6-bromo-3-oxo-3,4-dihydro-2H-1,4-benzoxazine-7-carboxylic acid (CAS 1094298-69-7)
- N-(Cyclopentylmethyl)-2,3-dihydrobenzofuran-6-amine (CAS 61070-38-0)
- Semaglutide impurity 195 (CAS CATO-C4X-2226195)
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