SCHEDULED MAINTENANCE
Direct fluorination of 4-fluorobenzoic acid, as a model substrate in a variety of reaction media, shows that 98% formic acid and concentrated sulfuric acid are excellent for promoting electrophilic fluorination. A high degree of fluorination may be achieved using concentrated sulfuric acid, showing that in this medium fluorine will act as a powerful electrophile.
R. D. Chambers, C. J. Skinner, J. Hutchinson and J. Thomson, J. Chem. Soc., Perkin Trans. 1, 1996, 605 DOI: 10.1039/P19960000605
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