二安息香酸 4,4'-ビフェニルジイルのFries転位

抄録

The Products, 3, 3'-dibenzoyl-4, 4'-biphenyldiol (2) and 3-benzoyl-3, 3'-biphenyldiol (3) were obtained in the Fries rearrangement of 4, 4'-biphenyldiyldibenzoate (1) using anhydrous aluminium chloride (AlCl₃) as a catalyst in various solvent (Table 1)
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When o-dichlorobenzene was used as a solvent, the higheryield of 2 was obtained in the Fries rearrangement of 1 (Table 1, Fig.1). In this reaction, the produc t, 3 was given predominantly via intramolecular migration of a benzoyl group and elimination of other one, and then ortho-position of 3 underwent electrophilic attack of benzoylcation to give 2 (Scheme 1).