Norbornanes. Part 10. Solvolysis of the Stereoisomeric 6-Cyano-2-norbornylp-Toluenesulfonates. A Correction
作者:Cyril A. Grob、Danielle Herzfeld
DOI:10.1002/hlca.19820650809
日期:1982.12.15
The solvolysis products of the stereoisomeric 6-cyano-2-norbornyl p-toluene sulfonates 1-4 (R CN) in dioxane/water 7 : 3 have been determined. In contrast to an earlier report the 6exo-cyano-2exo-norbornyl p-toluenesulfonate (1; RCN) yields 30% of the 2endo-alcohol 9 (RCN) beside the 2exo-alcohol 10 and the norbornenes 12 and 13. The results confirm that - I substituents at C(6) reduce 1,3-bridging
立体异构6-氰基-2-降冰片的溶剂分解产物p -甲苯磺酸盐1 - 4 3具有已确定:在二恶烷/水7(R CN)。相反到较早的报告6外切-氰基-2-外型-norbornyl p甲苯磺酸盐(1 ; RCN),得到2的30%的内切-醇9(RCN)的2旁外型-醇10和降冰片烯12和13 。结果证实,在C(6)处的-I取代基减少了中间降冰片基阳离子中的1,3-桥连,并因此降低了其重排速率。某些6-氟-和6-氰基-2 exo降冰片基对甲苯磺酸盐的较高速率常数归因于6-氟和氰基取代基的共轭作用所辅助的C,C-超共轭。