Nuclear magnetic resonance signals integration

When 51V nuclear magnetic resonance (NMR) was used to follow the catalysis of trimethoxybenzene (tmb) bromination, the only vanadium species that were observed under conditions of 0.5 mM total vanadium(V) were oxodiper-oxovanadium(V) (V0(02)2 , -688 ppm), oxoperoxovanadium(V) (V0(02)+, -529 ppm), and cw-dioxovanadium(V) (-540 ppm). Within the experimental error of the integration, all of the vanadium was detected in the vanadium(V) oxidation state under turnover conditions, since the integrated signal intensity at various times throughout the reaction was equivalent to that of an equimolar solution of cis-V02+. 

Nuclear Magnetic Resonance Spectra. Sad tier Research Laboratories, Philadelphia. Proton NMR spectra of more than 64,000 compounds. Peaks are assigned to the hydrogen nuclei responsible for the absorptions, and integration of the signals is shown on many of the spectra. 

Regiostructures for soluble poly(CHD) and its copolymers are determined by solution nuclear magnetic resonance (NMR) spectroscopy. For the poly(CHD) unit, the Ho, Ha, and Hb protons (Figure 18.2) are identified with signals at, respectively, 5.73, 2.01, and 1.56 ppm. There are equal numbers of Ho and Ha protons in the 1,4-unit of poly(CHD), while the ratio of Ho to Ha protons in the 1,2-unit is 2 3. Therefore, regioregularity can be estimated by the Ho/Ha integral value ratio. 

Nuclear magnetic resonance (NMR) spectroscopy is nowadays one of the most powerful techniques available to the chemist to elucidate the stracture of organic compotmds. However, in order to measure chemical shifts, coupling constants and peak integrations, the NMR signals should be clearly separated. Overlap is not a serious problem in NMR spectra, but is more... 

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