Furans These are five membered rings with one oxygen and two double bonds.(Furan is an aromatic molecule). H H OCH HH H H H furan 3-methoxyfuran tetrahydrofuran(THF) (oxolane) Pyrans These are six membered rings with one oxygen and two double bonds. HH H、H H、CH H H H H H- 夕 pyran 4-methylpyran tetrahydropyran(THP) (oxane) Chl4 Ethers and Epoxides (landscape).docx Page 5Ch14 Ethers and Epoxides (landscape).docx Page 5 Furans These are five membered rings with one oxygen and two double bonds. (Furan is an aromatic molecule). Pyrans These are six membered rings with one oxygen and two double bonds