Table 11: 13C NMR Data for 3a-f; chemical shifts in ppm relative to TMS(1%) at room temperature in CDCl3.

No. X Aromatic Piperazine I Piperazine II Me1 Me2 X
3a p-CN 153.8, 150.8, 138.3, 51.6 (a) 20.6 13.9 108.6(CN)
133.1, 131.4
    126.0, 125.8, 121.2,          
    119.4, 116.8          
3b p-CO2CH3 154.1, 150.9, 138.2,          
131.4, 130.6 (b) (a) 20.6 13.9 51.9(OMe)
    127.2, 126.0, 125.7,         167.0(C=O)
    120.5, 116.9        
3c p-Br 151.0, 149.4, 138.2, 51.7 (a) 20.6 13.9  
131.9, 131.4  
    125.9, 125.6, 122.3,          
    119.3, 116.8          
3d p-CH3 151.1, 148.2, 138.1,          
    135.9, 131.3 51.7 47.9 20.6 13.9 21.0(Me)
    129.5, 125.9, 125.5,          
    120.6, 116.8          
3e p-NO2 155.5, 150.7, 145.2,          
    138.3, 131.4 (a) (a) 20.6 13.9  
    126.0, 125.8, 124.9,          
    120.8, 116.9          
3f H 150.7, 150.1, 137.8, 51.4 48.9 20.3 13.5  
130.9, 128.5  
    125.8, 125.5, 125.1,          
    120.4, 116.4          

(a) Not detected(b) Masked by O-methyl carbon signal