10.1021/ja01332a059
The study investigates the behavior of mixed halogenated phenols and cresols in the Zincke method of nitration. Various mixed halogenated phenols, such as 2-bromo-4-chlorophenol, 2-chloro-4-bromophenol, and their derivatives, were prepared and subjected to nitration. The researchers observed that when bromine occupies both ortho and para positions in a phenol or cresol, isomeric mononitro compounds can be formed. For the first time, it was shown that a phenol with hydrogen in one ortho position and bromine in the other can undergo nitration at both positions in the same experiment. Chlorine was found not to be replaceable by the nitro group under the studied conditions. The study also provided further evidence supporting the view that only one acetyl-benzoyl derivative can be prepared from an o-aminophenol regardless of the order of introduction of the acyl radicals.