Lanthanide shift reagent effects on NMR spectra of organosulfur compounds-HSAB theory
✍ Scribed by Terence C. Morrill; Robert J. Opitz; Richard Mozzer
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- French
- Weight
- 269 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Because of the tremendous value of lanthanide shift reagents for simplification of NMR spectra of organic compounds, it is especially important to know the precise structural features that mark an organic substrate as amenable to shift reaqent analysis. Despite the large . amount of published work on shift reaqents', surprisingly little work has been done to identify the microscopic details and theoretical basis for identification of substrates that will interact with shift reaqents to a degree sufficient for analysis. The results of the work in our 76, * d.
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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
The configurations (c& or trans) of the members (L-2) of a group of alkenols (L), obtained, as described in the preceding communication, 1 from additions of Grignard reagents to R1\ , c=c ,(CH2)nhHR4 R2 'R3
## Abstract Well resolved natural‐abundance ^17^O NMR spectra of the eight 1,6‐anhydro‐β‐D‐hexopyranoses and three deoxy model compounds were recorded in aqueous solution at 90°C. The assignment of the resonances was obtained by chemical shift comparison, __O__‐acetylation, lanthanide shift reagent