Anisole—also known as methoxybenzene—is an aromatic ether with wide industrial applications in pharmaceuticals, agrochemicals, perfumery, and more. With the molecular formula C₇H₈O, it is a colorless to pale yellow liquid with a pleasant, sweet odor. Understanding the chemical properties of Anisole is essential for chemists, researchers, and industries that use it as an intermediate or solvent.
In this blog, we explore the key chemical and physical properties of Anisole, along with its reactivity, molecular structure, and practical applications.
🔬 What is Anisole?
- Chemical Name: Methoxybenzene
- Common Name: Anisole
- IUPAC Name: Methoxybenzene
- CAS Number: 100-66-3
- Molecular Formula: C₇H₈O
- Molar Mass: 108.14 g/mol
- Structure: A benzene ring substituted with a methoxy group (-OCH₃) at the para position
⚗️ Physical Properties of Anisole
| Property | Value |
|---|---|
| Appearance | Colorless to pale yellow liquid |
| Odor | Pleasant, sweet, ether-like |
| Boiling Point | ~154–156°C |
| Melting Point | -37°C |
| Flash Point | ~49°C (closed cup) |
| Density (20°C) | 0.995 g/cm³ |
| Solubility in Water | Slightly soluble (~0.8 g/L) |
| Solubility in Organic Solvents | Miscible in alcohol, ether, benzene, chloroform |
These physical characteristics make Anisole an ideal solvent and intermediate in several chemical processes.
⚛️ Chemical Properties of Anisole
- Aromaticity
Anisole contains a benzene ring, making it an aromatic compound. The methoxy group (-OCH₃) is an electron-donating group that activates the ring towards electrophilic substitution. - Electrophilic Aromatic Substitution (EAS)
Anisole readily undergoes EAS reactions, such as:- Nitration
- Halogenation
- Sulfonation
- Stability
Anisole is more reactive than benzene in electrophilic reactions due to the resonance effect of the methoxy group. - Combustibility
As an aromatic ether, Anisole is flammable and should be stored away from heat, sparks, and open flames. - Oxidation
Under certain conditions, Anisole can be oxidized to anisic acid or other derivatives using strong oxidizing agents.
🔍 Reactivity Profile
- Incompatible with: Strong oxidizers, strong acids, and bases
- Reactions include: Ether cleavage under acidic conditions, oxidation, bromination, and Friedel-Crafts acylation
- Functional Groups: Aromatic ring and ether (–OCH₃) group
- Stability: Chemically stable under ambient conditions but sensitive to strong acids and prolonged heat
🧪 Industrial Relevance of Anisole
Thanks to its stable yet reactive nature, Anisole is widely used in:
- Pharmaceuticals – as an intermediate in the synthesis of drugs like Tamoxifen
- Perfumery – for its pleasant odor and as a precursor to fragrances
- Agrochemicals – as a base for developing herbicides and fungicides
- Specialty Chemicals – for polymers, dyes, and resins
- Research & Laboratory Use – as a reagent and solvent in organic synthesis
⚠️ Handling & Safety Tips
- Hazard Class: Flammable liquid (Class 3)
- Use gloves, safety goggles, and lab coats while handling
- Ensure proper ventilation
- Store in a cool, dry, and well-ventilated area, away from sunlight and ignition sources
- Refer to the Material Safety Data Sheet (MSDS) for complete handling guidelines