Table 14: 13C NMR Data for 6a-e; chemical shifts in ppm relative to TMS(1%) at room temperature in CDCl3.

      Piperazine Piperazine      
No. X Aromatic I II CH2 CH3 X
6a p-CN 153.8, 138.0, 137.5, 52.1(br) (a) 62.75 21.4 108.4(CN)
133.0, 129.8
    128.3, 128.1, 126.2,          
    121.1,119.4          
    154.1, 138.0, 137.6,          
6b p-CO2CH3 130.6,129.8 52.3(br) (a) 62.8 21.4 51.9(OMe)
    128.73,128.0,127.0,         167.0(C=O)
    126.2,120.4        
6c p-Br 149.5, 138.0, 137.7, 52.3 (a) 62.8 21.4 -
131.8,129.8
    128.3, 128.1, 126.2,          
    122.3,119.1          
    148.2, 137.9, 137.7,          
6d p-CH3 135.8,129.8 52.4 47.4(br) 62.9 21.4 21.0(Me)
    129.5, 128.2, 128.0,          
    126.2,120.5          
    155.6, 145.1,          
6e p-NO2 138.1, 128.3 52.7(br) 51.6(br) 62.7 21.4 -
    128.2, 126.2,          
    124.8, 120.7          

(a) Not detected