A well-known route to aryl and alkyl bromides is the Hunsdiecker reaction2 or its more recent modification byCristol and Firth3. The latter workers found that mercuric salts of carboxylic acids could replace the more tediously prepared and sensitive silver salts in the key bromodecarboxylation step upon treatment with bromine.Recent studies on the scope and mechanism4-6 of the Cristol-Firth modification indicate that the carboxylic. © 1979, American Chemical Society. All rights reserved.