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4'-Chloropropiophenone
1. Basic Information
Name: 4'-Chloropropiophenone
Alias: 1-(4-Chlorophenyl)propan-1-one, p-Chloropropiophenone
CAS No.: 6285-05-8
Molecular Formula: C9H9ClO
Molecular Weight: 168.62
Category: Para-chlorinated aromatic ketone pharmaceutical intermediate, fine chemical building block, organic synthesis raw material
2. Physical and Chemical Properties
Physical Properties
- Appearance: White to pale off-white crystalline solid
- Odor: Mild characteristic aromatic ketone odor
- Solubility: Soluble in ethanol, methanol, acetone, toluene, dichloromethane; slightly soluble in hot water; insoluble in cold water and aliphatic alkanes
- Melting Point: 34–36 ℃
- Boiling Point: 248–251 ℃
- Density (20℃): 1.16 g/cm3
- Flash Point: 112 ℃
- Hygroscopy: Non-hygroscopic under normal humidity
- Aqueous property: Neutral solid, stable in neutral and weak acid aqueous environment, no hydrolysis at room temperature
Chemical Properties
- Molecular structure: Benzene ring with para chlorine substituent and propanone side chain, contains aryl chloride and aliphatic ketone carbonyl
- Carbonyl condensation: Ketone group undergoes aldol condensation, imine formation, reduction to alcohol/amine for constructing drug molecular skeletons
- Aromatic substitution: Para chlorine can participate in nucleophilic aromatic substitution reactions to introduce amino, alkoxy groups
- Side chain modification: Propionyl side chain can be halogenated at α-position to prepare α-haloketone intermediates
- Thermal stability: Stable below 180 ℃; long-term heating above boiling point causes slight decomposition and discoloration
- Photostability: Slightly light-sensitive, long-term UV irradiation turns pale yellow
- Compatibility: Compatible with anhydrous polar and non-polar organic solvents; incompatible with strong oxidants, concentrated strong alkali, strong reducing agents
3. Main Application Fields
1. Pharmaceutical Synthetic Intermediate (Core Application)
Key chlorinated aromatic ketone building block for antidepressants, anti-inflammatory drugs, antihistamine and cardiovascular therapeutic APIs
2. Fine Organic Synthesis Raw Material
Precursor for heterocyclic compounds, chiral amine intermediates and pesticide synthetic fragments
3. Laboratory Synthetic Chemistry Reagent
Substrate for ketone reduction, halogenation and aromatic nucleophilic substitution research
4. Fragrance Intermediate
Raw material for synthesizing chlorine-containing aromatic ketone flavor compounds
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 6285-05-8 |
| Molecular Formula | C9H9ClO |
| Appearance | Uniform white crystal without yellow impurities |
| GC/HPLC Purity | Pharma Intermediate Grade ≥98.0% |
| Melting Point | 34–36 ℃ |
| Water Content (KF) | ≤0.10% |
| Residue on Ignition | ≤0.10% |
| Single Maximum Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 10g/100g vacuum aluminum foil bag, 25kg light-proof PE lined fiber drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 ℃, full light shielding, isolate oxidants and alkaline substances |
| Transportation Requirement | Light-sensitive chlorinated aromatic ketone solid, moisture-proof light-proof sealed packaging |
| Shelf Life | 24 months under nitrogen vacuum sealed storage |
Safety Warning
Low-toxic irritant chlorinated aromatic ketone crystalline powder. Dust irritates eyes, nasal tract and respiratory mucosa; long-term skin contact causes mild dry itching. All operations must be carried out in ventilated fume hood with dust-proof respirator and nitrile chemical-resistant gloves. Avoid mixing with strong oxidants to prevent oxidative discoloration. Waste liquid neutralized with dilute acid before discharge; solid waste classified as halogen-containing fine chemical hazardous waste disposed by licensed professional institutions.
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