Heterocyclic compounds

cyclic chemical compound having as ring members atoms of at least two different elements

nomenclature of heterocycles

any heterocyclic compound having at least one nitrogen heteroatom

class of compounds

thumb|right|The atrane structure Atranes are a class of tricyclic molecules that are fused to a common central bond. Unlike the propellanes, the central bond is a transannular dative bond from a Lewis base—typically nitrogen—at one bridgehead to a Lewis acidic atom such as silicon or boron at the other bridgehead. Each of the three rings is therefore heterocyclic. Each of the rings is typically five atoms, or sometimes six atoms. The name "atrane" was first proposed by .