Molbank 2006, M482 |
Ibrahim Bouabdallah*,
Abdelkrim Ramdani, Ismail Zidane and Rachid Touzani
Laboratoire de Chimie
Organique Physique, D¨¦partement
de Chimie, Facult¨¦ des
Sciences, Universit¨¦ Mohamed Premier, BP 524, 60000,
Oujda, Maroc.
e-mail : [email protected]
*Author to whom correspondence should be addressed
Received:
Keywords: Bipyrazol,
ligand, benzyl, bidentate
A mixture of 5,5¡¯-diphenyl-3,3¡¯-bipyrazole 1 (143 mg, 0.5 mmol) [1] and potassium tert-butoxide (112 mg, 1 mmol) in 20 mL of dry THF was stirred under reflux for 30 min [2]. After cooling the mixture to 0¡ãC, the benzylbromide (171 mg, 1 mmol) in THF (5 mL) was then added drop by drop. After stirring under reflux for 3 h, the mixture was filtered and evaporated. The residue was purified on silica column (CH2Cl2) and recrystallized from ethanol, to give product 2 (0.17g, 73 % yield) as a white solid.
Melting point: 236 - 237¡ãC (EtOH)
IR (KBr, cm-1) : 3050 (¦ÍC-H, arom.);
1500 (¦ÍC=N); 1470 (¦ÍC=C);
1420; 1370; 1345; 1325; 1300 (¦ÄC-N);
1190; 1105; 1030; 945; 835; 820; 800; 750; 725.
1H-NMR (CDCl3, 300 MHz) : d= 7.34 - 7.33 (m, 12 H, H3¡¯¡¯¡¯, H3¡¯¡¯, H4¡¯¡¯¡¯ , H4¡¯¡¯) ; 7.25 (d, 4 H, H2¡¯¡¯, J = 8.8 Hz); 7.08 (d, 4 H, H2¡¯¡¯¡¯, J = 8.5 Hz); 6.78 (s, 2 H, C4-H) ; 5.40 (s, 4 H, C6H5-CH2).
13C-NMR (CDCl3, 75 MHz) : d= 146.27 (C3); 145.55 (C5); 138.15 (C1¡¯¡¯¡¯); 131.01 (C1¡¯¡¯); 129.12 (C3¡¯¡¯); 128.99 (C2¡¯¡¯); 128.92 (C3¡¯¡¯¡¯); 128.81(C4¡¯¡¯); 127.69 (C4¡¯¡¯¡¯); 127.05 (C2¡¯¡¯¡¯); 104.78 (C4); 53.68 (CH2).
MS (EI), m/z: 466 (35.3 %); 430 (0.1
%); 389 (9.0 %); 363 (29.8 %); 321(0.4 %); 277 (11.3 %); 105 (18.0 %); 91(100.0
%); 77(14.8 %); 51(6.4 %).
References and Notes:
1. Shironina,
T. M. ; Igidov, N. M. ; Koz¡¯minykh,
E. N. ; Kon¡¯shina, L. O.; Kasatkina,
Yu. S. and Koz¡¯minykh, V. O.
Russ. J. Org. Chem., 2001, 37, 10, 1486-1494.
2. Bouabdallah, I.; Ramdani, A.; Zidane, I.; Touzani, R.; Eddike, D.; Radi, S. and Haidoux, A. Journal Marocain de Chimie h¨¦t¨¦rocyclique, in press, 2004.
Sample Availability: Available from MDPI.
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