| abstract |
A process for producing p,p'-biphenyl by the dealkylation reaction of 3,3',5,5'-tetra-t-butyl-4,4'-dihydroxybiphenyl, said reaction being carried out in the presence of an acid catalyst using as solvent a saturated hydrocarbon having a boiling point of 190°C or above, an alicyclic hydrocarbon having a boiling point of 190°C or above, a hydrocarbon with an iodine value of no more than 1, sulfolane, or a mixture of these solvents. |