Preparation of the title compound 1 is described. An important transannular effect between the two unconjugated s-cis-butadiene chromophores is observed by comparison of the UV. spectra of the tetramethylidenenorbornane 1 and the dimethylidenenorbornane 3. The differences observed between the UV. spectra of 2,3,5,6-tetramethylidene-7-oxanorbornane 2 and 1 are also discussed briefly.
描述了标题化合物1的制备。通过比较紫外线,可以观察到两个未共轭的顺式-顺式-
丁二烯生色团之间的重要跨环效应。亚甲基降
冰片烷1和亚甲基降
冰片烷3的光谱。紫外之间观察到差异。还简要讨论了2,3,5,6-四亚甲基-7-氧杂
硼烷2和1的光谱。