Fig. 2From: Synthesis, density functional theory study and in vitro antimicrobial evaluation of new benzimidazole Mannich basesSynthetic pathways for Mannich bases 1–5; Reagents and conditions: i. HCl 4N, 2 h at 140°, NH3; ii. CH2O, HNR1R2, HCl, EtOH, 3 h reflux under stiringBack to article page