Carbon-13 NMR data for 15 substituted 1,2,4-triazol-3-ones are presented and discussed with regard to enolization in the neutral molecules. The coupling constant and chemical shift data show that the proton at N-2 is not exchanging rapidly in the DMSO-d6 solvent. Using D2OOD as a ...
Agreement between the calculted and observed chemical shifts of all carbons was excellent for both PB and PP. 展开 关键词: <sup>13</sup>C NMR Chemical Shift Poly(1-butene) Polypropylene Rotational State Model DOI: 10.1295/polymj.16.717 ...
Theoretical studies on structures, 13C NMR chemical shifts, aromaticity, and chemical reactivity of finite-length open-ended armchair single-walled carbon ... The geometries, chemical shifts, aromaticity, and reactivity of finite-length open-ended armchair single-walled carbon nanotubes (SWCNTs) ...
ChemInform Abstract: ACETYLATION EFFECT ON CARBON-13 NMR SHIFTS OF OLEFINIC CARBON ATOMS IN ALLYLIC TYPE ALCOHOLSmagnetic resonance, nuclear quadrupole resonance (organic substancesNo abstract is available for this article.doi:10.1002/chin.198111060
The position of the cis double bond was most clearly demonstrated tobe at C-9, C-10 by the 13C-NMR spectrum of violeoxanthin20 (Table OH IX X 1); especially by the characteristic shifts oHhe 9-methyl and C-8 signals. In a study of the ß-CwWittig salt (XIV) the spectrum is ...
15N solid-state MAS NMR spectroscopy Gas-phase absorption procedure: prior to the adsorption of the probe molecule (15N labeled acetonitrile, ACN, Cambridge Isotope Laboratories, Andover, MA), a desirable amount of catalyst was first placed in a fixed-bed reactor at near ambient pressure. The sa...
A regular convergence of selected structural, NMR, and Raman parameters with the molecular system size increase was observed, and a simple two-parameter mathematical formula enabled their estimation in infinity. The predicted 13C NMR chemical shifts of carbon atoms close to the substituted rim of ...
Structural effects in solvolytic reactions. 43. Effect of increasing electron demand on the carbon-13 NMR shifts for 2-aryl-3-methyl-2-butyl cations. A static system becoming an equilibrating system with electron-withdrawing substituents - ResearchGateDOI...
300 cm−1.13C solid-state NMR was therefore performed to show the presence of carbon (Fig. 2b). Interestingly, the resonance appears around 125 p.p.m., similar to that of reduced graphene oxide/graphite27, which corresponds tosp2carbons with an electron density very similar to graphite...
could be determined by the substitution of hydrogen by deuterium in the solid products. After the reaction, FTIR and solid-state1H NMR were applied to analyze the substitution of hydrogen by deuterium according to the peak shifts in FTIR spectra and the peak intensity variations in NMR spectra....