## Abstract The 1,3‐dipolar addition reaction of acrylonitrile to the betaine 1‐phenyl or methyl‐3‐oxidopyridinium is not so highly regioselective as generally assumed. New regioisomers are isolated. Their structures are proven by mass spectroscopy and proton‐and carbon‐NMR spectroscopy. Some 3,4di
Assignment of the 13C NMR signals of some 8-azaadenine, 2,6-diaminopurine and 2,6-diamino-8-azapurine carbonucleosides
✍ Scribed by M. Teijeira; C. Terán; E. Uriarte
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 39 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
The 13 C NMR signals of various 9-(2-hydroxymethylcyclopentyl)purines and 9-(2-hydroxymethylcyclopentylmethyl)purines (purine D 8-azaadenine, 2,6-diaminopurine or 2,6-diamino-8-azapurine) were fully assigned with the aid of one-dimensional ( 1 H, 1 H-1 H NOE, DEPT) and two-dimensional (HMQC and HMBC) NMR experiments.
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The total assignment of the 1 H and 13 C NMR spectra of 24 cis-endo and 15 cis-exo diastereoisomers of C-1-substituted 2,4-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one derivatives was deduced from the concerted application of DEPT, COSY, HETCOR, HMBC, HMQC and PS-NOESY experiments. The relative stereo
The 1H and 13C NMR spectra of cis-endo (a) and cis-exo (b) diastereoisomeric pairs of Ðve di †erently C-1-functionalized 2,4-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-ones were completely assigned. Several trends regarding the variation of chemical shifts and coupling constants of hydrogen and carbon a
Assignments of Some Amidoximes, 13C NMR 1,2,4-(thiones) and Oxa(thia)diazole-5(4H)