Entry  Catalyst  Solvent Condition Time (h) Time (h) 1 TMSCl CH3CN Reflux 14.0 36 2 PMA solid CH3CN Ref lux 11.0 42 3 FeCl3 CH3CN Ref lux 10.0 45 4 PTSA CH3CN Ref lux 9.0 45 5 5%WO3/ZrO2 CH3CN R.T 4.6 65 6 5%WO3/ZrO2 CH3CN  Reflux 0.5 94

Table 1: Effect of different reagents and solvents in the condensation of o-phenylenediamine 1, phenacyl bromide 2.