(t) Electrophilic aromatic substitution ll nR2 H-N-C-R A strongly activiting group tho-& para-position NH NH2 Br/ho br BI H2 NHCOCH CH3COCH-列 C-CH3 Br2/H20 H,O P B(七) Electrophilic aromatic substitution NH2 NR2 N C R O H A strongly activiting group Ortho- & Para- position NH2 Br 2/H2O NH2 Br Br Br NH2 N C CH3 O H Br 2 /H2O NHCOCH3 Br CH3COCl Pyr. H2O H+ or OH￾NH2 Br