Application of lanthanide shift reagents to the determination of sequences in an aromatic copolyterephthalate by7H-NMR-spectroscopy
β Scribed by Marek Matlengiewicz; Eligia Turska
- Publisher
- Springer
- Year
- 1982
- Tongue
- English
- Weight
- 380 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0170-0839
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Much evidence has been provided for the presence of contact-term contribution to paramagnetic shifts induced by lanthanide shift reagents (1) in 'H, 13C, 14N, 19F, and 3'P NMR spectroscopy (2,3). Conspicuous effects of contact shifts (C.S .) have been observed in 13C NMR spectra of stronger Lewis ba
## Abstract Metabolism of ^13^Cβenriched metabolites can be advantageously studied by reverseβpolarization transfer methods. In this work an improved reverseβDEPT sequence has been applied for the first time on perfused organs in a 20βmm probe. The metabolic fate of 99% enriched [ 2β^13^C] acetate