Aromatic halides are dehalogenated by heating with NaOH in alcoholic solvents in the presence of transition metal salts, such as rhodium(III) chloride or palladium(II) acetate and triphenylphosphine. Bis(pentabromophenyl) ether was converted into diphenyl ether in 2-propanol when treated for 5 h at 355 K with a catalytic cycle of more than 80.
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Okamoto et al. (1981) studied this question.