✍ Scribed by Stefan Berger
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📜 SIMILAR VOLUMES
Full 13C NMR shift assignments have been made for both the sterculate and malvalate moieties in the seed oil from Sterculia fi~etida, and the chain distribution has been determined from quantitative NMR measurements. The proportion of malvalate is not significant at the inner chain position.
## Abstract Vitamin E is oxidized with iodine and the oxidation product reduced with vitamin C with ^13^C‐NMR monitoring. It is shown that both the tocopheryl radical and the tocopherylquinone are reduced back to vitamin E by ascorbic acid.
## Abstract The natural abundance ^13^C magnetic resonance spectra of reduced proaporphines are reported, with complete assignments based on peak multiplicity and empirical calculations of chemical shifts. The chemical shift values of C‐8, C‐12 and C‐7 are found to be strongly diagnostic of the spi
## Abstract The natural abundance ^13^C magnetic resonance spectra of some Papaveraceae alkaloids have been determined at 22·628 MHz employing the pulse Fourier transform technique. Several techniques were employed to aid in spectral assignments and it has been possible to make self‐consistent assi
Analysis of 'H and 13C! spectra of l-'3C-acctyl&ne giver the same relative sign for JCH and -I&. Precise chemical shift valyes due to isotopic substitution are reported and compared with the earlier results. The chemical shift anisotropics (Ao) in acetylene and 1,2-13 C-acetylene arc found to be 22