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Fluorinated pyridylenediamine monomers prepared by Vaganova et al. Conditions: a = NH3 (ex), 100 °C, 15 h; b = NH3 (ex), 150 °C, 50 h; c = 1.1 equiv. Zn, 1.7 equiv. NaOH, H2O, 20 °C, 10 h, then NH3 (ex), 120 °C, 35 h; d = 1.5 equiv. CaCl2, dicyclohexano–18-crown-6, sulfolane, reflux, 5 h, then NH3 (ex), 110 °C, 10 h; e = tetrafluoro-4-pyridinoxide, sulfolane, reflux, 20 h, then NH3 (ex), 10–15 °C, 10 h.
