SEARCH Articles Figures Tables Acid halides Acidic halides Carboxylic acid halides Carboxylic acids acid halides Carboxylic halides 229 Halides carboxylation Halides carboxylic acid halide Pyridine carboxylates Pyridine halides Pyridine-2-carboxylate Pyridine-carboxylic acids Pyridines acidity