High-precision 14N NMR measurements of solvent-induced shielding variations are reported for some nitrosobenzene systems. These variations are shown to result from a combination of three major factors, solvent to solute hydrogen bonding where the solute nitrogen lone pair electrons are involved, sol
Solvent effects on the nitrogen NMR shieldings of 3-methylsydnone and ab initio calculations of the shieldings including related oxazole and oxadiazole systems
โ Scribed by Michal Witanowski; Zenobia Biedrzycka; Zbigniew Grabowski
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 99 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0749-1581
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Solvent effects on the nitrogen shieldings of N,N-dimethylacetamidine (1) were found to be extremely large for the imino group (about 120 ppm) and for the amino moiety (about 50 ppm). A detailed analysis of the solvent-induced variations revealed contributions from three large interactions. These ar
High-precision 14N NMR shielding data are reported for 2-methyl-2-nitrosopropane and its azodioxy dimer in a variety of solvents. A range of about 30 ppm, as a function of solvent, is observed for the nitroso nitrogen atom. This contrasts with the corresponding shielding range for the dimer, which i