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Using Preparation Method 1, 4-bromobenzoic acid was reacted with n-propylamine. The resulting reaction mixture was purified using SiO2 With 100% CH2Cl2 to give a white solid (67%). NMR1H (ppm, CDCl3): 7.61 (d, J3=8.60 Hz, 2H), 7.54 (d, J3=8.57 Hz, 2H), 6.06 (br. s., 1H), 3.43-3.37 (m, 2H), 1.62 (sext., J3=7.25 Hz, 2H), 0.97 (t, J3=7.39 Hz, 3H).

1. customThe resulting reaction mixture
2. customwas purified