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  1. 1-Butene - Wikipedia

  2. 1-Butene | C4H8 | CID 7844 - PubChem

  3. 1-Butene - NIST Chemistry WebBook

  4. 1-Butene | C4H8 - ChemSpider

  5. Butene | Alkenes, Polymers, Petrochemicals | Britannica

  6. 1-butene Formula & Structure - Purdue University

  7. 13.1: Alkenes- Structures and Names - Chemistry LibreTexts

  8. 1-Butene - NIST Chemistry WebBook

  9. 1-Butene - NIST Chemistry WebBook

  10. Butene - Purdue University