Volume : 2, Issue : 9, September - 2013

Axial & Equatorial Protons Coupling Studies of 1–(2–Fluoro–4–Nitrophenyl)–N,N–Dimethylazetidin–3–Amine Using Decoupling Technique of Nmr Spectroscopy

Prashant Dwivedi, Kartikeya Dwivedi, K Vijay Kumar

Abstract :

The chemical–shift difference, δae between the axial and the equatorial protons has been always a matter of discussion . In virtually every case, the shielding contribution to δae (β)from the C–X bond appears to have the opposite sign from that to δae(α). There are reasonable grounds to exclude an electric field effect or a directed inductive effect as the cause of this sign reversal. A model for diamagnetic anisotropy with the principal axis of magnetic susceptibility along the C–X bond can also be excluded, since it predicts identical effects on δae(α) and δae (β)