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Antarafacial - suprafacial
Antarafacial and suprafacial are two topological concepts in organic chemistry describing the relationship between two simultaneous chemical bond making and/or bond breaking processes in or around a reaction center . The reaction center can be a p-orbital, a conjugated system or even a sigma bond.
Additional recommended knowledge
An example is the [1,3]-hydride shift in which the interacting frontier orbitals are the allyl free radical and the hydrogen 1s orbitals. The suprafacial shift is symmetry forbidden because orbitals with opposite algebraic signs overlap. The symmetry allowed antarafacial shift would require a strained transition state and is also unlikely. In contrast a symmetry allowed and suprafacial [1,5]-hydride shift is a common event .
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Antarafacial_-_suprafacial". A list of authors is available in Wikipedia.