Biphenyl

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Related to biphenyls: Polybrominated biphenyls, Aroclor

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 ?
In her speech, Aziza Hamrouni Kerrou, national coordinator of PCB management activities, said that "ANGED is working on the implementation of a national plan for the elimination of PCBs through the rational and ecological management of electrical equipment and waste containing or contaminated with polychlorinated biphenyls.
In utero exposure to polychlorinated biphenyls and sensorineural hearing loss in 8-year-old children.
Chiral biphenyl dopants, conformationally restricted (1-8) and unrestricted (9-19) biphenyl core were investigated by using DFT studies, the computed data of dipole moment () and dihedral angle between two phenyl rings (Fig.
Developmental exposure to polychlorinated biphenyls exerts thyroid hormone-like effects on the expression of RC3/neurogranin and myelin basic protein messenger ribonucleic acids in the developing rat brain.
Another accidental food contamination event in Michigan in 1973 led to the exposure of more than 4,000 individuals to polybrominated biphenyls (PBBs).
Degradation of polychlorinated biphenyls (PCBs) by Staphylococcus xylosus in liquid media and meat mixture.
RM 8504, Transformer Oil, is intended to be used as a diluent oil with transformer oil Standard Reference Materials (SRMs) 3075 to 3080 and SRM 3090 [1] when developing and validating methods for the determination of polychlorinated biphenyls (PCBs) as Aroclors (1) in transformer oil or similar matrices.
The State of Wisconsin Department of Natural Resources (W-DNR), Madison, Wisconsin, USA says the long-awaited cleanup of polychlorinated biphenyls (PCB) began the week of September 13 at two of Wisconsin's worst PCB contamination sites, while work at third site moved into a critical phase during the same period.
In the final part, there are chapters summarising a wide range of other chemical residues in food, from xenoestrogens/endocrine disruptors and dietary estrogens to polycyclic aromatic hydrocarbons, dioxins and polychlorinated biphenyls. Pesticide, veterinary and other residues in food will be of interest to all those concerned with ensuring the safety of food.
The Convention also demands a complete phase-out of polychlorinated biphenyls and waste containing PCBs.
Polychlorinated biphenyls (PCB) are environmental contaminants that have been a problem since the 1960s.
The US government banned PCBs, or polychlorinated biphenyls, in 1979.