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Hexaphenylbenzene xtal.png
IUPAC name
3D model (JSmol)
ECHA InfoCard 100.012.356
Molar mass 534.6876
Melting point 454 to 456 °C (849 to 853 °F; 727 to 729 K)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Hexaphenylbenzene is an aromatic compound composed of a benzene ring substituted with six phenyl rings.

It may be prepared through a Diels-Alder reaction by refluxing tetraphenylcyclopentadienone and diphenylacetylene in benzophenone or other high-temperature solvent.[1]

Hexaphenylbenzene synthesis


Perspective view of the crystal structure of hexaphenylbenzene, showing the rotation of the phenyl rings. Hydrogen atoms have been omitted for clarity.[2]

Due to steric congestion among the phenyl rings, the stable conformation of this molecule has the phenyl rings rotated out of the plane of the central benzene ring. In the crystalline form shown on the left, the molecule forms a propeller-like conformation in which the phenyl rings are rotated about 65°,[2] while in the gas phase, they are perpendicular with some slight oscillations.[3]


Compounds belonging to the wider class of hexaarylbenzenes are of some scientific interest [4]


  1. ^ a b Louis Fieser (1973). "Hexaphenylbenzene". Organic Syntheses.; Collective Volume, 5, p. 604
  2. ^ a b Bart, J. C. J. (1968). "The crystal structure of a modification of hexaphenylbenzene". Acta Crystallographica Section B. 24 (10): 1277. doi:10.1107/S0567740868004176.
  3. ^ Gust, D. (1977). "Restricted Rotation in Hexaarylbenzenes". J. Am. Chem. Soc. 99 (21): 6980–6982. doi:10.1021/ja00463a034.
  4. ^ Hexaarylbenzene: Evolution of Properties and Applications of Multitalented Scaffold Varun Vij, Vandana Bhalla, and Manoj Kumar Chemical Reviews Article ASAP 2016 doi:10.1021/acs.chemrev.6b00144