Crystal structures of 3‐methyl‐2(1H)‐quinoxalinone and three substituted derivatives |
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Authors: | Denise Mondieig Philippe Negrier Stéphane Massip Jean Michel Leger Chakir Jarmoumi Brahim Lakhrissi |
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Affiliation: | 1. Centre de Physique Moléculaire, Optique et Hertzienne, Université Bordeaux 1, UMR 5798 au CNRS, 351 cours de la Libération, 33405 Talence Cedex, France;2. Laboratoire de Pharmacochimie, EA 4138 Université Victor Segalen Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France;3. Laboratoire de Chimie des Agroressources et Génie des Procédés, Département de Chimie, Faculté des Sciences, Kénitra, Morocco |
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Abstract: | 3‐Methyl‐2(1H)‐quinoxalinone and three derivatives (3,7‐dimethyl‐2(1H)‐quinoxalinone, 3‐methyl‐6,7‐dichloro‐2(1H)‐quinoxalinone and 3‐methyl‐7‐nitro‐2(1H)‐quinoxalinone) have been synthesised and analysed by 1H NMR and IR spectral spectroscopies. The crystal structures have been determined at room temperature from X‐ray single crystal diffraction data for three of them and from powder diffraction data for the nitro derivative. 3‐Methyl‐2(1H)‐quinoxalinone crystallises in the P21/c monoclinic system, 3,7‐dimethyl‐2(1H)‐quinoxalinone in the Pbca orthorhombic system and the two others compounds in the P$overline {1} $ triclinic system. For the nitro derivative, C? H$cdots $ N short contacts are established between the carbon of the methyl and the double bounded nitrogen of the ring. For the three other compounds N? H$cdots $ O hydrogen bonds involve the atoms of the heterocyclic ring. Copyright © 2011 John Wiley & Sons, Ltd. |
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Keywords: | 3‐methyl‐2(1H)‐quinoxalinone derivative intermolecular interaction powder structure single crystal structure synthesis |
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