(S)-exo -5-降冰片烯基-2-氧氯卡宾的碎片化(3)提供(S)-exo -5-降冰片烯基-2-氯化物(4),(R)-内-5-降冰片烯基-2-氯化物(5)和(S)-3-降三环氯乙烯(6)具有不同程度的对映异构体过量。S N i断裂和逃逸至降冰片烯基/降三环基离子对的加权混合物合理化了立体化学结果。
Endo Entry to the Nortricyclyl−Norbornenyl Cation System: Stereochemistry in the Fragmentation of <i>endo</i>-5-Norbornenyl-2-oxychlorocarbene
作者:Robert A. Moss、Xiaolin Fu、Ronald R. Sauers、Peter Wipf
DOI:10.1021/jo051222o
日期:2005.10.1
mainly to retention and inversion SNi transition states, respectively. These have been located by computational methods and are nearly isoenergetic. In more polar solvents (CDCl3 and CD3CN), the fragmentation of (S)-8 increasingly occurs via competitive ion pair pathways in which steroselectivity is diminished, and escape to the norbornenyl−nortricyclyl cation directs the products away from endo-2-chloro-5-norbornene
The fragmentation of exo-5-norbornenyl-2-oxychlorocarbene: stereochemistry and mechanism
作者:Xiaolin Fu、Robert A. Moss、Ronald R. Sauers、Peter Wipf
DOI:10.1016/j.tetlet.2005.03.208
日期:2005.6
The fragmentation of (S)-exo-5-norbornenyl-2-oxychlorocarbene (3) affords (S)-exo-5-norbornenyl-2-chloride (4), (R)-endo-5-norbornenyl-2-chloride (5), and (S)-3-nortricyclyl chloride (6) with varying degrees of enantiomeric excess. A weighted blend of SNi fragmentation and escape to norbornenyl/nortricyclyl ion pairs rationalizes the stereochemical results.
(S)-exo -5-降冰片烯基-2-氧氯卡宾的碎片化(3)提供(S)-exo -5-降冰片烯基-2-氯化物(4),(R)-内-5-降冰片烯基-2-氯化物(5)和(S)-3-降三环氯乙烯(6)具有不同程度的对映异构体过量。S N i断裂和逃逸至降冰片烯基/降三环基离子对的加权混合物合理化了立体化学结果。
ALNAJJAR M. S.; KUIVILA H. G., J. ORG. CHEM., 1981, 46, NO 6, 1053-1057