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Synthesis, characterization and X-ray crystal structures of chiral ferrocene-containing β-diketones

Abstract : Three new chiral ferrocene-containing β-diketones have been synthesized by reacting 1-ferrocenyl ethanol with the corresponding 1,3-diketone reagent MeCOCH2COR (R = Me, 4-C6H4OMe, Fc; Fc = (η5-C5H5)Fe(η5-C5H4)), using cerium(IV) ammonium nitrate (CAN) mediated C-C bond formation. These compounds identified as 3-(1-ferrocenylethyl)-pentane-2,4-dione (1), 1-(4-methoxyphenyl)-2-(1-ferrocenylethyl)-butane-1,3-dione (2), and 1-ferrocenyl-2-(1-ferrocenylethyl)-butane-1,3-dione (3), have been isolated as air and thermally stable microcrystalline solids in 79, 63 and 44% yields, respectively. Compounds 2 and 3 were formed in 63:37 and 88:12 diastereomeric ratios, respectively. They have been fully characterized by elemental analyses, FT-IR spectra, mass spectrometry, and their complete assignments have been conducted using 2D NMR experiments. In addition, their molecular identity and geometry have been confirmed by single-crystal X-ray diffraction, and both solution and solid state measurements have shown that the three complexes exist solely as their diketo tautomers.
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Submitted on : Wednesday, July 10, 2013 - 10:48:36 AM
Last modification on : Friday, November 26, 2021 - 2:46:29 PM
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Guillermo Ahumada, Thierry Roisnel, Sourisak Sinbandhit, Carolina Manzur, David Carrillo, et al.. Synthesis, characterization and X-ray crystal structures of chiral ferrocene-containing β-diketones. Journal of Organometallic Chemistry, Elsevier, 2013, 737, pp.1-6. ⟨10.1016/j.jorganchem.2013.03.032⟩. ⟨hal-00843023⟩



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