Long-range spin-spin coupling between N-methyl and ring protons in some purines and pteridines
✍ Scribed by Ilana Tamir
- Publisher
- Elsevier Science
- Year
- 1976
- Weight
- 432 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0022-2364
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The 'H N M R spectra of some aryl-and heteroaryl-substituted methylenemalonaldehydes were measured and analysed. The long-range proton-proton spin-spin coupling constants were used to estimate the conformational behaviour of the aryl group relative to the vinyl and aldehyde groups. The compounds ser
## Abstract The coupling constants ^n^__J__(^77^Se^31^P), __n__ = 1–4, have been measured in the proton‐decoupled ^31^P NMR spectra of a range of diphosphorus selenides and diselenides. ^31^P–{^1^H, ^31^P} and ^31^P–{^1^H, ^77^Se} triple resonance experiments have been used to establish the signs o