Meanwhile the mechanism of the intramolecular cycloaddition of cis, cis-1, 5-cyclooctadiene to tricyclo [3.3.0.0~(2,6)]-octane under >250nm irradiation is also discussed.

• 对在大于250nm光波照射下；顺；顺-1；5-环辛二烯分子内环加成形成三环-[3.；3