The p-orbital lobes that make contact in the forming ?-bond are from opposite sides of the ?-system.
2.
X-rays yesterday revealed defenseman Grant Ledyard has a fracture of the left orbital lobe ( eye socket ).
3.
? 1 and ? 3 are symmetric with respect to the mirror plane as the sign of the p-orbital lobes is preserved under the symmetry transformation.
4.
Similarly, ? 1 and ? 3 are antisymmetric with respect to the C 2 axis as the rotation inverts the sign of the p-orbital lobes uniformly.
5.
This result can either be derived via an FMO analysis based upon the sign of p-orbital lobes of the HOMO of the polyene or with correlation diagrams.
6.
Conversely, a " disrotatory " mechanism corresponds to a " suprafacial " bond topology as the forming ?-bond is between p-orbital lobes on the same side of the ?-system.
7.
A set of contiguous atoms and their associated orbitals that react as one unit in a pericyclic reaction is known as a " component ", and each component is said to be " antarafacial " or " suprafacial " depending on whether the orbital lobes that interact during the reaction are on the opposite or same side of the nodal plane, respectively.
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