Metalloles are metallacycle derivatives of cyclopentadiene in which the carbon atom at position 5, the saturated carbon, is replaced by a heteroatom.
In contrast to its parent compound, the numbering of the metallole starts at the heteroatom.
Some of these compounds are described as organometallic compounds, but in the list below quite a number of metalloids are present too.
Polymeric derivatives of pyrrole and thiophene are of interest in molecular electronics.
Metalloles, which can also be viewed as structural analogs of pyrrole, include: