| 摘要 |
PURPOSE:An alpha-azohydroperoxide is dissolved in an aromatic hydrocarbon and subjected to radical decomposition by light irradiation and/or heating to produce safely a biphenyl which is used as a starting material for high polymers in high yield. CONSTITUTION:A compound of formula I (R1 is H, X; n is 4-7) is dissolved in a substrate of an aromatic compound of formula II (R2 is H, methyl, ethyl, methoxy, X) and subjected to radical decomposition with light and/or heat to give a biphenyl. Light irradiation is effected with high-pressure mercury lamp, metal halide lamp or fluorescent lamp emitting light of 3,200-4,200Angstrom for 2- 10 hours and heating is carried out at a lower temperature than the boiling point of the substrate. The reaction is preferably carried out in the atmosphere of a gas inert to the radicals formed such as Ar, N2, He or under evacuated conditions. EFFECT:The process is in no need of high temperature and high pressure and can conducted by no use of water and catalysts.
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