4-Chloro-2,5-dimethoxybenzoic acid CAS 42020-23-5
| CAS No. | 42020-23-5 |
| Molecular Formula | C9H9ClO4 |
| Molecular Weight | 216.62 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Chloro-2,5-dimethoxybenzoic acid (CAS 42020-23-5), molecular formula C9H9ClO4 and molecular weight 216.62 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system, 4-Chloro-2,5-dimethoxybenzoic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 216.62 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO manufactures 4-Chloro-2,5-dimethoxybenzoic 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 | C9H9ClO4 |
| Molecular Weight | 216.62 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1969 |
| Halogen Content | Cl-containing |
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- 2-Chloro-6-(methoxymethoxy)benzoic acid (CAS 1253188-17-8)
Recommended Standards
- 4-Amino-5-chloro-6-ethoxypicolinic acid (CAS 904311-15-5)
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- 4-Chloro-5-ethoxy-2-nitroaniline (CAS 579474-32-1)
- (2-Methyl-1,2,3,4-tetrahydroisoquinolin-7-yl)methanol (CAS 1398413-60-9)
- n-(Piperidin-4-yl)-4-(trifluoromethyl)pyridin-2-amine trihydrochloride (CAS 1779124-63-8)
- 3-(4-Allyl-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)-1-(3-chlorobenzyl)pyridin-2(1H)-one (CAS 242472-30-6)
- (±)-2-Chlorobutane-d9 (CAS 175540-77-9)
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- 74800-62-7 4-(5-Pentyl-1,3-dioxan-2-yl)benzonitrile EINECS 278-001-2 (CAS 74800-62-7)
- Thiamine Impurity 41 (CAS 92325-11-6)
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