Figure 1.
General synthetic procedure for title compounds 1–13. R = 1: 2-Cl; 2: 3-Cl; 3: 4-Cl; 4: 2-F; 5: 4-F; 6: 2,4-di-F; 7: 2,6-di-F; 8: 2-NO2; 9: 4-NO2; 10: 4-Br; 11: 4-Me; 12: 4-OMe; 13: H.
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