Ring Closure of Alkoxycarbonyl(tetracarbonyl)pyruvoyliron Complexes into Metallalactones Induced by Nucleophilic Attack of Carbanions

Abstract : The reaction of carbanions with the pyruvoyl-substituted iron complex [(CO)4Fe(CO2CH3){C(O)C(O)CH3}] (1) affords the anionic trifunctionalized metallalactones [(CO)3Fe{C(O)C(CH3)(CRR′R″)OC4(O)(Fe–C4)}(CO2CH3)]– (3), whose formation results from the addition of the nucleophile to the β carbonyl of the pyruvoyl moiety, followed by attack of the oxygen of this β carbonyl on a terminal carbonyl ligand. These anionic lactones react, at low temperature, with HCl to give rise to the neutral lactones [(CO)4Fe{C(O)C(CH3)(CRR′R″)OC4(O)(Fe–C4)}] (2), which were previously obtained by addition of NuH nucleophiles to 1. Complex 3(3), whose lactonic ring formation has been performed using the diethyl malonate anion (R = R′ = CO2C2H5; R″ = H), and the dimethyl-substituted neutral lactone 2(1) (R = R′ = R″ = H) have been characterized by X-ray diffraction studies
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European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2006, 2006 (7), pp.1515 - 1524. 〈10.1002/ejic.200500997〉
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Soumis le : mercredi 6 septembre 2017 - 12:52:04
Dernière modification le : jeudi 11 janvier 2018 - 06:17:07

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Patrice Cabon, René Rumin, Jean-Yves Salaün, Hervé Des Abbayes, Smail Triki. Ring Closure of Alkoxycarbonyl(tetracarbonyl)pyruvoyliron Complexes into Metallalactones Induced by Nucleophilic Attack of Carbanions. European Journal of Inorganic Chemistry, Wiley-VCH Verlag, 2006, 2006 (7), pp.1515 - 1524. 〈10.1002/ejic.200500997〉. 〈hal-01582650〉

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