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. Author manuscript; available in PMC: 2014 Nov 17.
Published in final edited form as: J Fluor Chem. 2013 Jul 1;151:1–6. doi: 10.1016/j.jfluchem.2013.03.021

Fig. 5.

Fig. 5

A proposed mechanism for the reaction of naphtholphthalein fluorination. Trifluoroacetic acid converts the reagent into the cation form, which can survive direct fluorination producing mono- and difluorinated products. The formula of monofluorinated derivative has a numbering scheme for the carbon atoms, which is used in the text.