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dc.contributor.authorLegnani, Laura-
dc.contributor.authorToma, L.-
dc.contributor.authorCaramella, Pierluigi-
dc.contributor.authorChiacchio, Maria A.-
dc.contributor.authorGiofrè, S.-
dc.contributor.authorDelso, J. Ignacio-
dc.contributor.authorTejero, Tomás-
dc.contributor.authorMerino, Pedro-
dc.identifierdoi: 10.1021/acs.joc.6b01420-
dc.identifiere-issn: 1520-6904-
dc.identifierissn: 0022-3263-
dc.identifier.citationJournal of Organic Chemistry 81(17): 7733-7740 (2016)-
dc.description.abstractThe thionation reaction of carbonyl compounds with Lawesson's reagent (LR) has been studied using density functional theory methods and topological analyses. After dissociation of LR, the reaction takes place through a two-step mechanism involving (i) a concerted cycloaddition between one monomer and the carbonyl compound to form a four-membered intermediate and (ii) a cycloreversion leading to the thiocarbonyl derivative and phenyl(thioxo)phosphine oxide. Topological analyses confirmed the concertedness and asynchronicity of the process. The second step is the rate-limiting one, and the whole process resembles the currently accepted mechanism for the lithium salt-free Wittig reaction. No zwitterionic intermediates are formed during the reaction, although stabilizing electrostatic interactions are present in initial stages. Phenyl(thioxo)phosphine oxide formed in the thionation reaction is capable of performing a second thionation, although with energy barriers higher than the first one. The driving force of the thionation reactions is the formation of trimers from the resulting monomers. In agreement with experimental observations, the amides are the most reactive when compared with esters, aldehydes, and ketones and the reaction is slightly influenced by the polarity of the solvent. Whereas for amides and esters substituents have little effect, aldehydes and ketones are influenced by both steric and electronic effects.-
dc.description.sponsorshipThis work was supported by the Spanish Ministerio de Economia y Competitividad (MINECO) (Project CTQ2013-44367-C2-1-P), by the Fondos Europeos para el Desarrollo Regional (FEDER), and by the Gobierno de Aragon (Zaragoza, Spain, Bioorganic Chemistry Group, E-10). M.A.C. thanks the University of Catania for partial financial support.-
dc.publisherAmerican Chemical Society-
dc.relation.isversionofPublisher's version-
dc.titleComputational mechanistic study of thionation of carbonyl compounds with Lawesson's reagent-
dc.description.versionPeer Reviewed-
dc.contributor.funderUniversità degli Studi di Catania-
dc.contributor.funderGobierno de Aragón-
dc.contributor.funderEuropean Commission-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
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