3-methyl-1-[3-(3-methyl-2-oxobutylidene)-1,4-dihydro-6-methyl-quinoxalin-2-ylidene]butan-2-one. 

Ibrahim Bouabdallah*, Ismail Zidane,  Rachid Touzani, Fouad Malek , Mohamed El Kodadi and Abdelkrim Ramdani.

Laboratoire de Chimie Organique Physique, Département de Chimie, Faculté des Sciences, Université Mohamed Premier, BP 524, 60000, Oujda , Maroc.

E-mail : [email protected]. ;  [email protected].

Received: 13 November 2003 / Accepted: 24 February 2004 / Published: 29 March 2004           

To a solution of 3,8-dihydroxy-2,9-dimethyl deca-3,7-diene-5,6-dione 2 [1] (452 g, 2 mmol) in absolute  ethanol (15 mL) was added  the 4-methylorthophenylenediamine 1 (244 mg, 2 mmol) and the mixture was refluxed  for  90 min [2] . The orange precipitate 3 was filtred off,  washed with ethanol and dried in air. 

Yield: (400 mg , 64 %). 

Melting  point: 98 - 99 °C (EtOH). 

IR (KBr, cm^-1):  2960 (CH of CH₃) ; 1560 (C=O). 

¹H-NMR (200 MHz, CDCl₃) d ppm:  14.66 (s, 2H, N-H); 14.46 (s, 2 H, N-H); 6.89 (m, 3H, CH Benz); 5.71 (s, 1H, =CH); 5.69 (s, 1H, =CH); 2.68 (m, 2H, C-H, J = 6.9 Hz); 2.32 (s, 3H, CH₃ ); 1.9 (d, 12H, CH₃, J = 6.9 Hz).

E. A:  Anal. Calc. for C₁₉H₂₄N₂O₂: C 73.05, H 7.74, N 8.97;  found : C 73.18, H 7.77, N 8.76.                                                               

References and notes:

1.      Bouabdallah, I.;  Zidane, I.;  Malek, F.;  Touzani, R.;  El Kodadi, M. and  Ramdani, A. Molbank, 2003, M 345. 

2.      Touzani, R.;  Ben-hadda, T.;  El Kadiri, S.;  Ramdani,A.;  Maury, O.;  Le Bozec, H.; Toupet, L. and  Dixneuf, P.H. New J. Chem., 2001, 25, 391-395.

 Sample Availability : Available from the Authors.

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