The sign of the scalar coupling between a carbonyl carbon and ห-proton J(C 0 ,H ห), for the cyclic dipeptide cyclo(Leu-Gly) was determined relative to that between an amide proton and ห-proton 3 J(H N ,H ห) by an E.COSYtype HSQC experiment. The pulse sequence used in this experiment gives a cross pe
1H and13C NMR Spectral Assignment of theN-Methyldiazabenzenes by Long-Range Coupling to the Methyl Group
โ Scribed by R. A. Newmark; A. Tucker; L. C. Hardy
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 164 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
Bldg 201-BS-07, Proton and carbon-I 3 assignments based on long-range coupling to the methyl protons are reported for the three isomeric N-methyldiazabenzene salts. All resolved "J,, coupling constants are reported.
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The current substantial interest concerning the structure elucidation of new active natural products led to the complete 1H and 13C chemical shift assignment of a triterpenoid derivative, methyl 2a,3b,24-tri-Oacetylolean-12a-chloro-28,13b-olide, obtained after acetylation and methylation of a mixtur