2,5-Dihydrofuran

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What Wikipedia says

2,5-Dihydrofuran is an organic compound classified as a monounsaturated derivative of furan. It is a colorless, volatile liquid. It can be produced from the acid-catalyzed rearrangement 1‑butene 3,4‑epoxide.

Excerpt from the Wikipedia article “2,5-Dihydrofuran”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: en:User_talk:Ronhjones, Public domain, via Wikimedia Commons.