Long-Distance Effect on One-Bond C?C Scalar couplings upon introduction of a double bond in bicyclic systems
作者:Graeme R. Jones、Stefano Caldarelli、Pierre Vogel
DOI:10.1002/hlca.19970800105
日期:1997.2.10
Anomalous variations of one-bond CC scalarcoupling constants are observed in going from trinorbornane-to trinorbornene-like structures. Most notably, a 10-Hz increase is observed in the coupling constant involving the C-atoms of the ethano branch facing the CC bond. An effect of about half the size is characteristic of higher homologues (bicyclo[2.2.2]octenes), but no such effect is observed for monocyclic