Benzophenone
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| Names | |
|---|---|
| IUPAC name
Diphenylmethanone
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| Other names
Benzophenone
Diphenyl ketone Benzoylbenzene Benzoylphenyl Diphenylmethanone | |
| Identifiers | |
| 119-61-9 | |
| Jmol-3D images | Image |
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| Properties | |
| C13H10O | |
| Molar mass | 182.22 g/mol |
| Appearance | White solid |
| Odor | Geranium-like |
| Density | 1.11 g/cm3 (20 °C) |
| Melting point | 48.5 °C (119.3 °F; 321.6 K) |
| Boiling point | 305.4 °C (581.7 °F; 578.5 K) |
| 0.0137 g/100 ml (at 25 °C) | |
| Solubility | Soluble in glacial acetic acid, acetone, benzene, carbon disulfide, CCl4, methanol |
| Solubility in diethyl ether | 16.6 g/100 ml |
| Solubility in ethanol | 13.3 g/100 ml |
| Vapor pressure | 1.93·10-3 mm Hg at 25 °C |
| Hazards | |
| Safety data sheet | [] |
| Flash point | 110 °C (230 °F; 383 K) |
| Related compounds | |
| Related compounds
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Acetophenone |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Benzophenone is the simplest di-aryl ketone.
It is often used in drying solvents together with sodium metal.
Contents
Properties
Chemical
Benzophenone can be reduced by sodium metal to produce the intensely blue colored benzophenone ketyl radical. This is highly reactive towards water and oxygen so it can be used as an indicator of solvent dryness.
Benzophenone is a strong UV absorber, owing to cross-conjugation. This results in its use as a UV photoinitiator in some UV curing resins. Derivatives of benzophenone are often used in sunscreens and as an additive to prevent the UV-induced degradation of polymers.
Physical
Benzophenone is a white solid, with a characteristic smell, practically insoluble in water, but more soluble in organic solvents.
Availability
Benzophenone is sold by lab suppliers. Can also be purchased from eBay.
Preparation
Benzophenone is produced by the copper-catalyzed oxidation of diphenylmethane with oxygen from air.
Projects
- Photosensitizer in photochemistry
- Water indicator in air-free techniques
Handling
Safety
Benzophenone is considered safe, but it may be irritant.
Storage
In sealed bottles.
Disposal
Can be neutralized by oxidizing it with an oxidizing solution/mixture.
