Table 12: 13C NMR Data for 4a-f; chemical shifts in ppm relative to TMS(1%) at room temperature in CDCl3.

No. X Aromatic Piperazine I Piperazine II CH2 CH3 X
4a p-CN 153.5, 136.7, 51.0(br) (a) 62.1 20.7 108.0(CN)
134.1, 132.6
    128.7, 128.7,          
    120.7, 119.0          
    153.8, 136.6,          
4b p-CO2CH3 134.2, 130.2 52.0(br) (a) 62.1 20.7 51.5(OMe)
    128.7, 128.7,         166.7(C=O)
    126.7, 119.9        
4c p-Br 149.5, 136.9, 52.2 48.0(br) 62.5 21.1  
134.6, 131.8  
    129.1, 129.0,          
    122.2, 119.1          
    148.2, 136.9,          
4d p-CH3 135.8, 134.8 52.3 47.4(br) 62.6 21.1 21.0(Me)
    129.5, 129.1,          
    129.0, 120.5          
    155.6, 145.0,          
4e p-NO2 137.1, 134.4 52.3(br) (a) 62.4 21.1  
    129.1, 129.0,          
    124.8, 120.7          
4f H 150.5, 136.9, 52.2 48.0(br) 62.5 21.1  
    134.7, 129.1          
    129.0, 128.9,          
    126.0, 120.7          

(a) Not detected