Biphenyl



Biphenyl
IUPAC name Biphenyl
Molecular formula C12H10
Molar mass 154.21 g/mol
CAS number 92-52-4
Density 1.04 g/cm3
Solubility Insoluble
Melting point

68.9 °C

Boiling point

256 °C

SMILES c1ccccc1(c2ccccc2)
Hazards
EU classification Irritant (Xi)
Dangerous for
the environment (N)
EU Index 601-042-00-8
NFPA 704
1
2
0
 
R-phrases R36/37/38, R50/53
S-phrases S61
Flash point 113 °C
Autoignition
temperature 		540 °C
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

 


Biphenyl (or diphenyl or phenyl benzene or 1,1'-biphenyl or lemonene) is a solid plastics.

Properties

Biphenyl occurs naturally in autoignition temperature is 540 °C.

Stereochemistry

Rotation about the single bond in biphenyl, and especially its asymmetric synthesis

Biological aspects

Biphenyl prevents the growth of molds and fungus, and is therefore used as a preservative (E230, in combination with E231, E232 and E233), particularly in the preservation of citrus fruits during transportation.

It is mildly toxic, but can be degraded biologically by conversion into nontoxic compounds. The ability to do so by adding oxygen molecules to the aromatic rings of biphenyl is found in some bacteria. It has been demonstrated that some bacteria that have degraded biphenyl can then also degrade synthetic substances that are considerably more harmful to the environment than their natural counterparts. [1]

Biphenyl compounds

Substituted biphenyls can be prepared synthetically by various liquid crystal mixture consisting of several cyanobiphenyls with long aliphatic tails used commercially in liquid crystal displays.

References

  1. ^ Biphenyl degradation - Streptomyces coelicolor, at GenomeNet Database
  • Biphenyl (1,1- Biphenyl). Wiley/VCH, Weinh. (1991), ISBN 3-527-28277-7
 
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