Pyrrole has this property because its lone electron pair can occupy a p orbital, thereby ensuring that it is cyclic, planar and conjugated with 4n + 2 pi electrons.
Compounds with this property have a negative value for Nucleus Independent Chemical Shift of a lithium ion, and the "Mobius" variety of this property was predicted by Heilbronner and contains a single out-of-phase overlap, thereby violating this property's most famous criterion. That criterion is also violated by the (*) "anti" variety of this property, as it lacks the necessary electron delocalization. Pyrrole has this property because its lone electron pair can occupy a p orbital, thereby ensuring that it is cyclic, planar and conjugated with 4n + 2 pi electrons. Usually obeying Huckel's Rule these are examples of, FTP, what property which imparts an unusual amount of stability to a system, shared by anthracene, napthalene and benzene?
Compounds with this property have a negative value for Nucleus Independent Chemical Shift of a lithium ion, and the "Mobius" variety of this property was predicted by Heilbronner and contains a single out-of-phase overlap, thereby violating this property's most famous criterion.
{aromaticity}