Diphenyl ether
Diphenyl ether (CAS: 101-84-8), also known as phenyl ether, is an organic compound with the molecular formula (C6H5)2O and a molecular weight of 170.21 g/mol. This aromatic ether presents as a colourless liquid or low-melting solid. It is widely employed as a high-boiling solvent, a heat transfer medium, and as a key intermediate in the synthesis of various organic compounds and polymers.
- IUPAC
- Diphenyl oxide,Phenyl ether
- Synonyms
- Diphenyl oxidePhenyl ether

Heat Transfer Fluid
Diphenyl ether's high boiling point (259 °C) and thermal stability make it an excellent component in heat transfer fluids, particularly for high-temperature industrial processes.
High-Boiling Solvent
Its properties as a solvent are useful in applications requiring elevated temperatures, facilitating reactions or dissolving materials that are insoluble at ambient conditions.
Chemical Synthesis Intermediate
Diphenyl ether serves as a building block in the synthesis of more complex organic molecules, including pharmaceuticals, agrochemicals, and specialty polymers.
Fragrance Component
In some formulations, diphenyl ether is used for its characteristic geranium-like scent, contributing to fragrance compositions.
| Molecular weight | 170.21 |
|---|---|
| Linear formula | (C6H5)2O |
| Assay | 99% |
| Grade | ReagentPlus® |
| Boiling point | 259 °C(lit.) |
| Density | 1.073 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.579(lit.) |
| Melting point | 25-27 °C(lit.) |
| Vapour pressure | <1 mmHg (20 °C) |
| Vapour density | >5.86 (25 °C, vs air) |
| Autoignition temp | 1144 °F |


Hazard statements
- H319Causes serious eye irritation
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P273Avoid release to the environment
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | 115 °C / 239 °F |
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xi,N |
| Risk statements (R) | 36-51/53 |
| Safety statements (S) | 26-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Expl Lim | 1.5 % |
|---|---|
| Gene Information | human ... TTR(7276) |
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Diphenyl ether (CAS 101-84-8) used for?
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Diphenyl ether is primarily used as a high-boiling solvent, a heat transfer medium, and an intermediate in organic synthesis. It also finds application in fragrance formulations.
What is the CAS number and molecular formula for Diphenyl ether?
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The CAS number for Diphenyl ether is 101-84-8, and its linear formula is (C6H5)2O.
What grade and purity does Tech Serve Solutions supply for Diphenyl ether?
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Tech Serve Solutions supplies Diphenyl ether at a minimum assay of 99% with a ReagentPlus® grade. This product is intended for laboratory and research purposes and is not represented as USP, BP, or EP grade.
How should Diphenyl ether be handled safely?
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Handling Diphenyl ether requires appropriate personal protective equipment, including a dust mask (N95 type), eyeshields, and gloves. It is classified as an irritant to the eyes (H319) and is toxic to aquatic life with long-lasting effects (H411). Ensure adequate ventilation and avoid release into the environment (P273).
Is Diphenyl ether supplied by Tech Serve Solutions available for export?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including Diphenyl ether.
How can I request a quote or sample for Diphenyl ether?
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To request a quote or sample for Diphenyl ether, please contact our sales team through the website or by phone.
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