Molecular structure of 3-trifluoroacetamidobenzoyltrifluoroacetone enol form
摘要:
3-Trifluoroacetamidobenzoyltrifluoroacetone formed in the reaction of 3-aminoacetophenone with an excess of methyl trifluoroacetate crystallizes in the cis-enol form with a hydroxy group located at the carbon atom bound with the trifluoromethyl substituent. Analysis of geometric characteristics indicate the presence of both intramolecular hydrogen bond in the enol fragment and intermolecular H...O contacts in the crystal of the compound.
Synthesis of 3-trifluoroacetamidobenzoyltrifluoroacetone and its luminescent europium complexes
作者:V. V. Semenov、N. V. Zolotareva、A. V. Cherkasov
DOI:10.1134/s107036321205012x
日期:2012.5
Reaction of 3-aminoacetophenone with excess of methyl trifluoroacetate proceeds in two stages and leads to the formation of 3-trifluoroacetamidobenzoyltrifluoroacetone 3-CF3C(O)NHC6H4C(O)CH2C(O)CF3 instead of the expected 3-aminobenzoyltrifluoroacetone 3-NH2C6H4C(O)CH2C(O)CF3. The cause is the readily proceeding reaction of CF3COOCH3 with amine group of the source 3-aminoacetophenone and the initial formation of 3-trifluoroacetamidoacetophenone. On the basis of the synthesized beta-diketone the luminescent complexes were synthesized: europium(III) tris(3-trifluoroacetamidobenzoyltrifluoroacetonate) trihydrate and europium(III) tris(3-trifluoroacetamidobenzoyltrifluoroacetonate)(phenanthroline). The trifluoroacetylamide group is converted into the primary amine by treatment the solutions of the europium complexes with aqueous alkali. The molecular and crystal structures of 3-trifluoroacetamidoacetophenone were investigated.