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cyclobutadiene
chemical compound
Learn about this topic in these articles:
nonbenzenoid aromatic compounds
- In hydrocarbon: Nonbenzenoid aromatic compounds
The earliest targets were cyclobutadiene (C4H4) and cyclooctatetraene (C8H8).
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organometallic compounds
- In organometallic compound: Cyclic polyene ligands
The cyclobutadiene ligand is a four-electron donor. It is unstable as the free (i.e., uncombined) hydrocarbon, but it is known to exist in stable complexes, including Ru(C4H4)(CO)3.
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