In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Tetra-tert-butyl 13,14-dioxapentacyclo[8.2.1.14,7.02,9.03,8]tetradeca-5,11-diene-5,6,11,12-tetracarboxylate, published in 2012-10-31, which mentions a compound: 92390-26-6, Name is Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium, Molecular C18H28ClRu, Name: Chloro(1,5-cyclooctadiene)(pentamethylcyclopentadienyl)ruthenium.
The stereochem. of the title compound, C32H44O10, at the cyclobutane ring is cis-anti-cis. The mol. lies across an inversion center. Crystallog. data and at. coordinates are given. In the crystal, weak C-H···O H bonds connect mols. into chains along [100], forming R 2 2(6) rings.
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method