All the possible undeuteriated benzoic acids were prepared mainly by treatment of the corresponding bromobenzoic acid with Raney CU-AI alloy in 10% NaOD-D20 solution. [2,3,4,5,6-2H5] Benzoic acid was obtained from pentafluorobenzoic acid by a similar reaction. However, only [2,3,4,5-2H4] benzoic acid was prepared by decarboxylation of [2,3,4,5-2H4] phthalic acid.
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