Deuterated, nuclear magnetic resonance spectrum

The nuclear magnetic resonance spectrum of valproic acid as shown in Figure 4 was obtained on a Varian Associates T-60 NMR Spectrometer as a 10% w/v solution in a solvent of deuterated chloroform. The spectral peak assignments (2) are presented in Table II. 

The carbon-13 nuclear magnetic resonance spectrum of a 4.7% (w/v) solution of dorzolamide hydrochloride was obtained in deuterated dimethyl sulfoxide, and is shown in Figure 9. The spectrum was recorded using a Brucker model AM-400 NMR spectrometer. The band assignments were referenced relative to dimethyl sulfoxide-ds (39.5 ppm), and the carbon atom assignments (using the same numbering system as just described) are collected in Table 5. 

If the unknown, neutral, oxygen-containing compound does not give the class reactions for aldehydes, ketones, esters and anhydrides, it is probably either an alcohol or an ether. Alcohols are readily identified by the intense characteristic hydroxyl adsorption which occurs as a broad band in the infrared spectrum at 3600-3300 cm-1 (O—H str.). In the nuclear magnetic resonance spectrum, the adsorption by the proton in the hydroxyl group gives rise to a broad peak the chemical shift of which is rather variable the peak disappears on deuteration. 

The nuclear magnetic resonance spectrum of prednisolone was taken with a Varian 60 MHZ spectrometer in deuterated dimethyl sulfoxide. The spectrum is reproduced in Fig. 4. 

The proton nuclear magnetic resonance ( H NMR) spectrum of chitin was obtained in concentrated and deuterated hydrochloric acid (DCl) (Fig. 2.19). Chitin can be rapidly dissolved in concentrated acid after wetting in dilute acid. The assignment of the resonances and their chemical shifts (ppm) is given in Table 2.11. The NMR spectrum shows the... 

Nuclear Magnetic Resonance Spectroscopy ( H NMR and NMR) Proton and carbon nuclear magnetic resonance sp>ectra (iH NMR and NMR, respectively) were obtained in a polynuclear JEOL Eclipse Plus 400 sp>ectrometer (400 MHz), using tetramethylsilane as the reference and deuterated chloroform and carbon tetrachloride as the solvent for NMR and iH NMR, respectively. i3C NMR spectrum were accumulated during 24 hours. 

While a number of different techniques may be used to chemically characterize the hydrogel, a common method used is nuclear magnetic resonance, here the gel is dried and deuterized and then the NMR spectrum is used to determine the composition of the various constituent building blocks that are used to prepare the gel. [75, 80] Sometimes the molecular weight distribution of the monomers is also determined using size exclusion chromatography [80]. 

The structure of SPEKs was usually determined by nuclear magnetic resonance (NMR) analysis. For each analysis, 3 wt.% polymer solution was prepared in deuterated dimethyl sulfoxide (DMSO-tfg) for HNMR and 15 wt.% for CNMR. The chemical shift of tetramethylsilane was used as the internal standard reference. The typical HNMR spectrum and its chemical shift assignment for SPEEK obtained by the postsulfonation method are also shown in Figure 5.14. 

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