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Phys Chem Chem Phys. 2008 Dec 28;10(48):7239-46. doi: 10.1039/b810343g. Epub 2008 Oct 23.

Rationalization of Diels-Alder reactions through the use of the dual reactivity descriptor Deltaf(r).

Author information

1
INAC/SCIB/LAN (UMR-E no. 3 CEA-UJF)), CEA-Grenoble, 17rue des Martyrs, F-38054, Grenoble Cedex 9, France. Christophe.morell@ujf-grenoble.fr

Abstract

In this work, the dual descriptor of chemical reactivity, an electronic density-based index, is used to study both the regioselectivity and the stereoselectivity of Diels-Alder reactions. The descriptor has been designed to simultaneously delineate the nucleophilic and electrophilic sites within a molecule. Subsequent pairing between the nucleophilic and electrophilic regions of the reagents predicts the major adducts in all cases studied. Specifically, the descriptor predicts the generation of a ortho-regioisomer when a diene monosubstitued at position 1 by an Electron Donating Group (EDG)/Electron Withdrawing Group (EWG), reacts with a dienophile monosubtituted by an EWG/EDG. Under the same conditions, if the diene is monosubstituted by either an EWG or an EDG at position 2, formation of the para-oriented adduct is predicted. This approach also provides insight into the stereoselectivity. For example, secondary interactions between the non-reactive regions of the reactants explain why the endo stereoisomer is preferred.

PMID:
19060968
DOI:
10.1039/b810343g

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