非芳香性（英文：nonaromaticity）是指環狀多烯的穩定性與開鏈多烯相近。環辛四烯具有典型的非芳香性，它有4n個π電子，但不是反芳香性的。因為其中的碳原子不在同一平面內，π電子不能離域。[1]
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