✦ LIBER ✦
Lanthanide shift reagents. IX. Proton and carbon magnetic resonance study of specific contact interactions of a bifunctional oxazole amide with fluorinated lanthanide shift reagents
✍ Scribed by David M. Rackham; Anthony F. Cockerill; Roger G. Harrison
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 231 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
Highly specific proton line‐broadening and paramagnetic ^13^C shifts observed for N‐butyl‐N(4‐methyloxazol‐2‐yl)‐2‐methylpropionamide in the presence of fluorinated lanthanide shift reagents, are absent when non‐fluorinated reagents are used. This unusual behaviour is rationalized in terms of possible chelation of the N‐butyl‐N(4‐methyloxazol‐2‐yl)‐2‐methylpropionamide to the lanthanide reagent, causing transfer of the unpaired electron into the heterocyclic ring.