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Revealing carbocations in highly asynchronous concerted reactions: The ene-type reaction between dithiocarboxylic acids and alkenes

AuthorsChiacchio, Maria A.; Legnani, Laura; Caramella, Pierluigi; Tejero, Tomás CSIC ORCID; Merino, Pedro CSIC ORCID
Hidden intermediates
Dithiocarboxylic acids
ELF analysis
Issue Date2018
CitationTetrahedron 74(39): 5627-5634 (2018)
AbstractThe ene-type reaction between (dithio)carboxylic acids and alkenes has been studied computationally by DFT and topological (analysis of the electron localization function, ELF) methods. The reaction proceeds under kinetic control and the observed differences in regioselectivity are well-explained by the relative stability of the different transition structures. In agreement with experimental observations, electron-rich alkenes lead to Markownikoff adducts while electron-poor alkenes lead to Michael adducts. In all cases the reaction proceeds through an only transition structure (one kinetic step) although a different synchronicity was observed depending on the alkene electronics. The ELF analysis of the reactions corroborates the existence of a transient carbocation (hidden intermediate) in the reactions with electron-rich alkenes. On the other hand, electron-poor alkenes proceed through a more synchronous concerted mechanism. It can be predicted that with electron-rich alkenes bearing highly donating the transient carbocations might be captured by a nucleophile.
Publisher version (URL)https://doi.org/10.1016/j.tet.2018.07.056
Appears in Collections:(ISQCH) Artículos
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