Biphenyl(redirected from Biphenyl compounds)
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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).