Biphenyl


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biphenyl

[bī′fen·əl]
(organic chemistry)
C12H10 A white or slightly yellow crystalline hydrocarbon, melting point 70.0°C, boiling point 255.9°C, and density 1.9896, which gives plates or monoclinic prismatic crystals; used as a heat-transfer medium and as a raw material for chlorinated diphenyls. Also known as diphenyl; phenylbenzene.

Biphenyl

 

C6H5—C6H5; colorless crystals. Melting point, 71°C; boiling point, 254°-255°C. It is insoluble in water and readily soluble in organic solvents. It is present in the anthracene oil produced from coal tar. It is prepared industrially by dehydrogenation of benzene at 750°–800°C.

Biphenyl is an intermediate in the production of some dyes; mixed with phenyl ether (73.5 percent), it is used as a high-temperature heat carrier (so-called Dowtherm).

References in periodicals archive ?
The project is aimed to ensure minimazation of Polychlorinated biphenyl relases and subsequent health and environmental implacts through systematic capacity development for sound Polychlorinated biphenyl management in the country.
In utero polychlorinated biphenyl exposures in relation to fetal and early childhood growth.
Polychlorinated biphenyls (PCBs) are manmade chemicals and well-known contaminants prevalent in both terrestrial and aquatic ecosystems.
Niimi (1988), "Trophodynamic Analysis of Polychlorinated Biphenyl Congeners and Other Chlorinated Hydrocarbons in the Lake Ontario Ecosystem," Environmental Science and Technology, 22(4):388-397.
Toxicity of 3,4,5,3',4',5'-hexabrominated biphenyl and 3,4,3',4'-tetrabrominated biphenyl.
There was no significant association between polychlorinated biphenyl levels and changes in cycle length or hormone levels.
Polychlorinated biphenyl concentration in raw and cooked north Atlantic bluefish fillets.
Aroclors) typically consist of 60-90 of the 209 possible congeners, each of which differs in the positions and/or numbers of chlorines on the biphenyl ring.
The directive requires that all new electrical equipment shipped to the European market after July 2006 contain less than maximum levels of the substances such as heavy metals (lead, cadmium, mercury, hexavalent chromium) and bromated flame retardants (polybromated biphenyl or polyborminated diphenyl ethers).
First, polybrominated biphenyl exposures have been associated with earlier menarche in girls, whereas experimental models show delayed puberty, a discordance that may be due to timing of exposure (Blanck et al.
The RoHS directive was established by the European Parliament and the Council of the European Union, requiring that electronics manufacturers not exceed new minimum acceptable levels of the following hazardous substances: lead, hexavalent chromium, mercury, polybrominated biphenyl, cadmium and polybrominated diphenyl ether.
The six substances covered under the RoHS mandate are lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated biphenyl ethers.