4-Chloro-9H-thioxanthen-9-one CAS 21908-85-0
| CAS No. | 21908-85-0 |
| Molecular Formula | C13H7ClOS |
| Molecular Weight | 246.71 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-Chloro-9H-thioxanthen-9-one.
4-Chloro-9H-thioxanthen-9-one (CAS 21908-85-0) is a high-purity analytical reference standard with the molecular formula C13H7ClOS and a molecular weight of 246.71 g/mol.
4-Chloro-9H-thioxanthen-9-one (C13H7ClOS) contains sulfur-containing functionality, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. Halogen substitution raises its density and boiling point, its high carbon-to-hydrogen ratio confers good lipid solubility; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C13H7ClOS |
| Molecular Weight | 246.71 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Chloro Standards
- 6-chloro-N-(cyclopropylmethyl)pyridine-3-sulfonamide (CAS 1016689-89-6)
- 2-Chloro-1-(methyl-d3)-6-phenylimidazo(4,5-b)pyridine (CAS 1020719-30-5)
- 2-Chloro-4-(pyrrolidine-1-sulfonyl)pyridine (CAS 1179655-82-3)
- methyl 4-chloro-2-(pyrrolidin-1-yl)-1,3-thiaZole-5-carboxylate (CAS 1183743-41-0)
- (Z)-1-Chloro-2-(2-(4-fluorophenyl)prop-1-en-1-yl)benzene (CAS 1187311-54-1)
- Potassium 5-chloro-2-hydroxyÂbenzÂenesulfoÂnate (CAS 120161-43-5)
- 2-Chloro-N-cyclobutylpyridine-3-sulfonamide (CAS 1247365-21-4)
- 2-Chloro-N-(tetrahydro-2H-pyran-4-yl)thiazole-5-carboxamide (CAS 1254970-18-7)
Recommended Standards
- 4-Chloro-3-(pyrrolidin-1-ylsulfonyl)pyridine (CAS 59582-93-3)
- 5-(1,3-Dioxolan-2-yl)-2-thienyl octyl ketone (CAS 898771-94-3)
- 4-Chloro-3-(1,1-dioxidoisothiazolidin-2-yl)aniline (CAS 494776-93-1)
- 5-(5-Chloro-2-thienyl)-3-methyl-5-oxovaleric acid (CAS 845781-52-4)
- Methyl 2-fluoro-4-(5-fluoro-2-methoxyphenyl)benzoate (CAS 1365272-32-7)
- Methyl 6-bromo-3-oxo-3,4-dihydropyrazine-2-carboxylate (CAS 21874-61-3)
- 2'-bromo-5',7'-dihydrospiro[cyclopropane-1,6'-pyrazolo[3,2-b][1,3]oxazine]-3'-carbaldehyde (CAS 1785004-48-9)
- 2-(3,3-Dimethylazetidin-1-yl)acetic acid (CAS 1508708-79-9)
- 1-(2-Bromobenzyl)-1H-indole-3-carbaldehyde (CAS 171734-73-9)
- Ethyl 2-(4-methoxyphenoxy)propanoate (CAS 111479-08-4)
- 4-((4-(Diethylamino)benzylidene)amino)-3-(3-ethoxyphenyl)-1H-1,2,4-triazole-5(4H)-thione (CAS 497921-92-3)
- 2-[(2,2,2-Trifluoroethyl)thio]-pyridine (CAS 162965-54-0)
- DIiodo[1,1′-(1,3-propanediyl)bis[1,1-diphenylphosphine-κP]]nickel (CAS 15819-01-9)
- [γ-Glu]15 Semaglutide (CAS CATO-C4X-222690)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com