128.7, 127.9, 126.7, 126.5, 124.7, 124.3, 120.3, 114.7. Anal. Calcd for C17H11N30: C,

74.71; H, 4.06; N, 15.38. Found: C, 74.57; H, 4.14; N, 15.38.

 1H-1,2,3-Benzotriazol-l-yl(2-pyrazinyl)methanone (4.2m): yield, 76%; Pale red

needles (recrystallized from chloroform/hexane); mp 146-147 OC; 1H NMR 6 9.35 (s,

1H), 8.89-8.87 (m, 2H), 8.41 (d, J= 6.0 Hz, 1H), 8.20 (d, J= 6.0 Hz, 1H), 7.65 (t, J=

7.8 Hz, 1H), 7.60 (t, J= 7.8 Hz, 1H); 13C NMR 6 163.7 (C=O), 147.5, 146.7, 145.8,

144.4, 131.7, 130.9, 126.9, 120.5, 114.5. Anal. Calcd for CllH7N50: C, 58.67; H, 3.13;

N, 31.10. Found: C, 58.72; H, 3.11; N, 31.27.

 1-(1H-1,2,3-Benzotriazol-l-yl)-3-phenyl-l-propanone (4.2n): yield, 84%;

Colorless needles (recrystallized from chloroform/hexane); mp 63-64 OC; 1H NMR 6

8.18 (d, J= 8.3 Hz, 1H), 8.01 (d, J= 8.3 Hz, 1H), 7.55 (t, J= 7.5 Hz, 1H), 7.40 (t, J= 7.5

Hz, 1H), 7.28-7.26 (m, 3H), 7.20-7.17(m, 2H), 3.70 (t, J= 7.6 Hz, 2H), 3.18 (t, J= 7.6

Hz, 2H); 13C NMR 6 171.3 (C=O), 145.8, 139.6, 130.7, 130.0, 128.4, 128.2, 126.2, 125.8,

119.8, 114.0, 36.8, 29.8. Anal. Calcd for C15H13N30: C, 71.70; H, 5.21; N, 16.72. Found:

C, 71.48; H, 5.35; N, 16.77.

 1-(1H-1,2,3-Benzotriazol-l-yl)-2,2-diphenyl-l-ethanone (4.2p): yield, 89%;

Colorless needles; mp 88-89 OC (mp[96HAC365] 106-107 OC); 1H NMR 6 8.32 (d, J=

8.4 Hz, 1H), 8.07 (d, J= 8.2 Hz, 1H), 7.62 (dd, J= 7.3, 7.3 Hz, 1H), 7.50-7.35 (m, 5H),

7.32-7.25 (m, 6H), 6.82 (s, 1H); 13C NMR 6 171.2 (C=O), 146.3, 137.4, 131.2, 130.4,

128.9, 128.8, 127.7, 126.3, 120.2, 114.5, 55.8 (CH).