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Analytical Chemistry and Spectroscopy (1)
Age; AGE; ALAGEALA; Alagea river, Russia; Approximate age of pith; Density, maximum; Density, minimum; Earlywood density; Earlywood width; Latewood density; Latewood width; NHD/WSL; Northern Hemispheric Dendroclimatological Network; Ring width; TREE; Tree ring sampling; WDD
Age; AGE; Approximate age of pith; Bonif, Quebec, Canada; Density, maximum; Density, minimum; Earlywood density; Earlywood width; Latewood density; Latewood width; NHD/WSL; Northern Hemispheric Dendroclimatological Network; QUEBEC; Ring width; TREE; Tree ring sampling; WDD
Chemistry (28)
Inorganic Chemistry (13)

Electronic Resource

Effect of the orientation of substituents on the chemical shifts of 13C. IVPart III: R. Heckendorn and T. Winkler, Helv. Chim. Acta 63, 1 (1980). - 13C NMR spectra of N,N-diisopropylamides and -thioamides (1981)

Fritz, Hans ; Hug, Paul ; Sauter, Hanspeter ; [et al.]

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 16 (1981), S. 36-43

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ISSN: 0030-4921

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: N,N-diisopropylamides and -thioamides show hindered rotation around the N—CH bonds, and the presence of mixtures of conformational isomers can be demonstrated at temperatures below 273 K in solution. 1H and 13C NMR spectra of these conformers are measured and assigned. The 13C data serve to study through-space effects on 13C chemical shifts, which strongly depend on the conformations of the isopropyl groups. For amides, a through-space shielding of the N-methine carbons is found to exist only for conformers in which the methine hydrogen atom is spatially close to the oxygen atom. Chemical shift differences between amides and thioamides can be rationalized in terms of through-bond and through-space contributions, and serve for a better understanding of the shift differences in N,N-dialkylamides and -thioamides.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/mrc.1270160111

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