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linas - 29 fvrier 2011 Laboratoire 3 Rduction de la...

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29 février 2011 Laboratoire # 3 : Réduction de la 3-nitroacétophénone Introduction La réaction équilibrée de la réaction du 3-nitroacétophénone est présentée ci-contre : C 8 H 7 NO 2 + NaBH 4 + H2O + HCl → H 2 + NaCl + BH 3 + C 8 H 8 NO 2 Le mécanisme simplifié de la réaction d’oxydo-réduction d’une cétone pour créer un groupement fonctionnel d’alcool est présentée ci-contre : Protocole et observation Produit chimique Masse molaire (g/mol) Quantité (g ou mL) Densité (g/mL) Moles (mol) 165.15g/mol 0.51g 1.433g/mL 0.0031 moles NaBH 4 37.83g/mol 0.17g 1.074g/mL 0.0045 moles Éthanol 46.07g/mol 5.90mL 0.789g/mL 0.101 moles Procédure : Décrite dans le manuel de laboratoire (Chimie organique I, manuel de laboratoire, Dr. William, W. Ogilvie, 2001, Exp. 3, p. 33-34). Aspect initial du mélange réactionnel:
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