New processes for the halofluorination of norbornadiene. Structural reexamination of the products. Evidence for exclusive exo attack by electrophiles
作者:Gérard Alvernhe、Daniel Anker、André Laurent、Günter Haufe、Claude Beguin
DOI:10.1016/s0040-4020(01)85985-8
日期:1988.1
using NBS in the presence of the new fluorinating agent Et3N/3HF leads to a 3:2 mixture of 3-exo-bromo-5-exo-fluoronortricyclane 1 and 3-exo-bromo-5-endo-fluoronortricyclane 2. The structures of these compounds were proven by independent syntheses and extensive NMR spectroscopic studies. The structure (3-endo-bromo-5-exo-fluoronortricyclane) given for the minor compound in the literature10 was revised especially
在新的氟化剂Et 3 N / 3HF存在下,使用NBS对降冰片二烯进行溴氟化,生成3:2的3-exo-bromo-5-exo-fluoronortricyclane 1和3-exo-bromo-5-endo-氟北三环烷2.这些化合物的结构已通过独立的合成和广泛的NMR光谱学研究证明。特别是通过比较两种化合物在13 C NMR光谱中的3 J CF耦合常数,对文献10中给出的次要化合物给出的结构(3-内-溴5-外-氟-正三环烷)进行了修改。如文献10所述,没有证据表明溴物种对降冰片二烯具有内消灭作用 被观测到。