seven-membered

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[网络] 七元

It shows that theoretically predicted chemical shifts of hydrogen atoms in methylene in seven-membered ring are in good agreement with experimental values.
结果表明，从头算法得到的七元环亚甲基上氢的化学位移理论值和实验值符合得很好。
The regioselectivity of intramolecular nucleophilic ring opening reaction of aziridines is controlled by the ring size of products, five-membered ring> six-membered ring> seven-membered ring.
分子内的亲核开环反应主要受成环时环大小的控制，成环时的倾向是五元环>六元环>七元环。
Stability and Resonance Energy of Dibenzo Seven-membered Heterocyclic Compounds
二苯并七员杂环化合物的稳定性及共振能
Synthesis, Crystal Structures and Properties of Seven-membered Heterocycle Bridged Biphenyl I. Synthesis and Structure Characterization of Biphenyl Containing Dioxygen Group in the Bridge
七元杂环桥连联苯化合物的合成、晶体结构及性质的研究I.含双氧桥连杂环衍生物的合成与结构表征
However, the preparation of these seven-membered compounds usually needs several steps and harsh reaction conditions.
然而，这类七元环化合物的制备通常需要多步反应以及苛刻的反应条件。