Effect of Aryl Substituents on the Reactivity of the Captodative Olefins 1-Acetylvinyl Arenecarboxylates
With the aim of evaluating the effect of substitution at the aryl moiety of the aroyloxy group of captodative olefins 1 on their reactivity in Diels-Alder and other reactions, the new series of olefins 1-acetylvinyl arenecarboxylates 1c-1k were prepared. No correlation was found between 13C NMR chemical shifts of the carbon atoms of the double bond and the electronic effects of the diverse substituents. However, an excellent correlation was observed between the energies of the FMOs (HF/6-31G*), or the corresponding atomic coefficients or the Mülliken charges at the carbon atoms of the double bond, and the Hammett σm and σp constants of the phenyl ring substituents of some members of the series, and of some other calculated analogues. These results strongly suggest that, in addition to the major effect of the electron-withdrawing group, the reactivity of captodative olefins 1 is also controlled by the long-range inductive effects of the substituent at the phenyl ring of the aroyloxy group.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Química de México A.C.
2006
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1870-249X2006000200001 |
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