## Abstract ^13^C n.m.r. spectra of some substituted isoxazoles have been examined to ascertain the reactive site in the metallation of 4‐substituted 3,5‐dimethylisoxazoles. The results obtained indicate that metallation occurred exclusively at the C‐5 methyl.
13C nuclear magnetic resonance study of some phosphinolipids: Assignments and conformational studies
✍ Scribed by Georg Kallinowski; Walter Vogt
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 345 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
C chemical shifts and ''P,l'C spin-spin coupling constants are reported for six model phosphinates and eight synthetic phosphinolipids. The complex spectra of the synthetic phosphinolipids could be assigned from increments and couplings derived from the model compounds. Based on these investigations the '4PC) couplings of 7-15 Hz indicate a preferential truns orientation of the respective head-group carbon relative to the phosphorus. This behaviour is similar to that of natural phosphatidylcholine lipids.
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