吡喃是六元杂环,非芳香环,由五个碳原子和一个氧原子组成,并含有两个双键.分子式为C5H6O,吡喃有两个异构体,其位置与双键的位置不同.在2H吡喃中,饱和碳处于位置2,而在4H-吡喃中,饱和碳位于位置4.
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