Diphenyl oxide; 1,1'-Oxybisbenzene; Phenoxybenzene
|Molar mass||170.21 g·mol−1|
|Appearance||Colorless solid or liquid|
|Density||1.08 g/cm3 (20°C)|
|Melting point||25 to 26 °C (77 to 79 °F; 298 to 299 K)|
|Boiling point||121 °C (250 °F; 394 K) at 1.34 kPa (10.05 mm Hg), 258 °C at 100 kPa (1 bar)|
|Vapor pressure||0.02 mmHg (25°C)|
|Safety data sheet||Aldrich MSDS|
|Flash point||115 °C (239 °F; 388 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
|3370 mg/kg (rat, oral)
4000 mg/kg (rat, oral)
4000 mg/kg (guinea pig, oral)
|US health exposure limits (NIOSH):|
|TWA 1 ppm (7 mg/m3)|
|TWA 1 ppm (7 mg/m3)|
IDLH (Immediate danger
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is: / ?)(|
Diphenyl ether is the organic compound with the formula O(C6H5)2. The molecule is subject to reactions typical of other phenyl rings, including hydroxylation, nitration, halogenation, sulfonation, and Friedel–Crafts alkylation or acylation. This simple diaryl ether enjoys a variety of niche applications.
Diphenyl ether and many of its properties were first reported as early as 1901. It is synthesized by a modification of the Williamson ether synthesis, here the reaction of phenol and bromobenzene in the presence of base and a catalytic amount of copper:
- PhONa + PhBr → PhOPh + NaBr
The main application of diphenyl ether is as a eutectic mixture with biphenyl, used as a heat transfer medium. Such a mixture is well-suited for heat transfer applications because of the relatively large temperature range of its liquid state. A eutectic mixture [commercially, Dowtherm A] is 73.5% diphenyl ether (diphenyl oxide) and 26.5% diphenyl (biphenyl).
Because of its odor reminiscent of scented geranium, as well as its stability and low price, diphenyl ether is used widely in soap perfumes. Diphenyl ether is also used as a processing aid in the production of polyesters.
Several polybrominated diphenyl ethers (PBDEs) are useful flame retardants. Of penta-, octa-, and decaBDE, the three most common PBDEs, only decaBDE is still in widespread use since its ban in the European Union in 2003. DecaBDE, also known as decabromodiphenyl oxide, is a high-volume industrial chemical with over 450,000 kilograms produced annually in the United States. Decabromodiphenyl oxide is sold under the trade name Saytex 102 as a flame retardant in the manufacture of paints and reinforced plastics.
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