The mechanism of the Soai reaction has been thoroughly investigated at the M05-2X/6-31G(d) level of theory, by considering ten energetically distinct paths. The study indicates the fully enantioselective catalytic cycle of the homochiral dimers to be the dominant mechanism. Two other catalytic cycles are shown to both be important for correct understanding of the Soai reaction. These are the catalytic cycle of the heterochiral dimer and the non-enantioselective catalytic cycle of the homochiral dimers. The former has been proved to be not really competitive with the principal cycle, as required for the Soai reaction to manifest chiral amplification, whereas the latter, which is only slightly competitive with the principal one, nicely explains the experimental enantioselectivity observed in the reaction of 2-methylpyrimidine-5-carbaldehyde. The study has also evidenced the inadequacy of the B3LYP functional for mechanistic investigations of the Soai reaction.

Schiaffino, L., Ercolani, G. (2010). Mechanism of the Asymmetric Autocatalytic Soai Reaction Studied by Density Functional Theory. CHEMISTRY-A EUROPEAN JOURNAL, 16(10), 3147-3156 [10.1002/chem.200902543].

Mechanism of the Asymmetric Autocatalytic Soai Reaction Studied by Density Functional Theory

SCHIAFFINO, LUCA;ERCOLANI, GIANFRANCO
2010-03-08

Abstract

The mechanism of the Soai reaction has been thoroughly investigated at the M05-2X/6-31G(d) level of theory, by considering ten energetically distinct paths. The study indicates the fully enantioselective catalytic cycle of the homochiral dimers to be the dominant mechanism. Two other catalytic cycles are shown to both be important for correct understanding of the Soai reaction. These are the catalytic cycle of the heterochiral dimer and the non-enantioselective catalytic cycle of the homochiral dimers. The former has been proved to be not really competitive with the principal cycle, as required for the Soai reaction to manifest chiral amplification, whereas the latter, which is only slightly competitive with the principal one, nicely explains the experimental enantioselectivity observed in the reaction of 2-methylpyrimidine-5-carbaldehyde. The study has also evidenced the inadequacy of the B3LYP functional for mechanistic investigations of the Soai reaction.
8-mar-2010
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/06 - CHIMICA ORGANICA
English
Con Impact Factor ISI
asymmetric amplification;autocatalysis;density functional calculations;reaction mechanisms;Soai reaction
http://onlinelibrary.wiley.com/doi/10.1002/chem.200902543/abstract
Schiaffino, L., Ercolani, G. (2010). Mechanism of the Asymmetric Autocatalytic Soai Reaction Studied by Density Functional Theory. CHEMISTRY-A EUROPEAN JOURNAL, 16(10), 3147-3156 [10.1002/chem.200902543].
Schiaffino, L; Ercolani, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/11626
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