Definition of "cyclobutane" []

• A simple alicyclic hydrocarbon, C4H8; a light inflammable gas. (noun)
• Any derivative of this compound. (noun)

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• "A much studied model reaction in organic chemistry is the ring opening of cyclobutane to yield ethylene or the reverse, the combining of two ethylene molecules to form cyclobutane."
• "How does the reaction from the cyclobutane molecule to two ethylene molecules actually proceed?"
• "You said "open chain structures" so I'm not considering ring structures like cyclobutane (C4H8)."