Patent ID: 7741426

Claim:
A method for the production of a fluorinated phenylenediamine represented by the following formula (2), which comprises a step of reacting a diamide represented by the following formula (1) with NaOX [wherein X stands for a bromine atom (Br) or a chlorine atom (Cl)] at a molar ratio of the NaOX to the diamide (NaOX/diamide ratio) in the range of 3.0-6.0 and NaOH at a molar ratio of the NaOH to the diamide (NaOH/diamide ratio) in the range of 1.8-4.0, wherein in the formulas (1) and (2), Y stands for a hydrogen atom (H), a bromine atom (Br), a chlorine atom (Cl), a fluorine atom (F), a C1-C5 alkyl group optionally having a substituent, or a C1-C5 alkoxyl group optionally having a substituent, l is an integer in the range of 1-4, m is an integer in the range of 0-3, provided that the total number of l and m (l+m) is 4; and, upon completion of the reaction, adding an alkali to adjust the pH of the solution to be in the range of 9 to 14.