Deutero chloroform

Of course, you don t have to use either of the above standards at all. In the case of samples run in deutero chloroform/methanol and dimethyl sulfoxide, it is perfectly acceptable, and arguably preferable, to reference your spectra to the residual solvent signal (e.g., CD2HOH) which is unavoidable and always present in your spectrum (see Table 2.2). These signals are perfectly solid in terms of their shifts (in pure solvent systems) though the same cannot be said for the residual HOD signal in D2O and for this reason, we would advise adhering to TSP for all samples run in D20. 

H n.m.r. spectra were recorded for the oils in deutero-chloroform or carbon tetrachloride at 90 MHz with tetramethy-silane as an internal standard using a Varian EM 390 instrument. 

Carbon tetrachloride - CC14 (///) Deutero chloroform - CDC13 (z v) Hexa chloroacetone - CC13 - CO-CCl3... 

Protonation shifts, obtained from nmr spectra in deutero-chloroform and trifluoroacetic acid, for 1-methylimidazoles also suggest that the cations show amidinium type resonance, because the signal of the proton on C-2 shifts downfield much more than those of the protons on C-4 and C-5 (Barlin and Batterham, 1967). Amidinium type resonance in benzimidazoles activates the proton on C-2, which becomes susceptible to base-catalysed exchange (Elvidge et al., 1973). The effects of protonation on electron densities in the imidazole ring have been calculated by extended Hiickel theory (Adam et al., 1967). 

The, 3C chemical shifts for quinoxalines have been explained in terms of the inductive and resonance effects of the substituents.265 Resonances at 144.8 and 142.8 <5 in the spectrum of quinoxaline in deutero-chloroform are assigned to carbon atoms 2 and 3 and 9 and 10, respectively. Carbons 5 and 8 resonate at 129.6, and carbons 6 and 7 at 129.4.266... 

Interpretation of Spectra. Spectra of the peracetate derivatives in deutero-chloroform were recorded at 80 MHz for protons and 20 MHz for carbons using a Varian FT80A spectrometer. Assignments for the H- and 13C-NMR spectra of the resorcinol, phloroglucinol, and catechin reaction products, summarized in Tables I and II, respectively, are largely drawn from previously reported results (5,[Pg.187]

Carbon disulphide - CS2 Carbon tetrachloride - CCL Deutero chloroform... 

The dimerisation of macrocycles of type 16 in deutero-chloroform has been investigated using H NMR and vapour pressure osmometry. Macrocycles of this type... 

Titration of guest into host in deutero-chloroform also confirmed the 1 1 stoichiometry of the complex and yielded an association constant of 1.2 x 10 dm molExchange between host and guest is fast on the H NMR timescale. Not surprisingly, the macrocyclic host binds p-benzoquinone specifically no complexation by this host was detected in the presence of a large excess of tetramethylbenzo-quinone, tetrachlorobenzoquinone or anthraquinone. 

The nuclear magnetic resonance (NMR) spectrum (Fig. 2) was obtained by preparing a saturated solution of meperidine hydrochloride, U.S.P. (Wyeth Lot No. F-665901) in deutero chloroform containing tetramethylsilane as internal reference. The only exchangeable proton is the hydrogen associated with HC1. The NMR proton spectral assignments are given in Table II. 

Figure 2.14 Proportions of axial conformer of 2-aryloxytetrahydropyrans in deutero-chloroform solution. The conformational equilibrium is invariant with X in cyclohexane (84-87% axial).

The sulfites are readily soluble in the chlorinated solvents such as carbon tetrachloride and deutero-chloroform. 

The Ketone linkage weakly deshields the protons of adjacent aliphatic groups but strongly deshields the ortho aromatic protons. The ketones are readily soluble in carbon tetrachloride and deutero-chloroform. 

The NMR spectrum (Figure 2) was obtained in a deutero chloroform solution of SK+F standard SJB- 6-226-A which contained about 100 mg/ml and tetramethyl-silane as internal reference on a JEOL Model C 60 H.The following assignments (Hz) were made by R. Warren ... 

The PMR spectra were taken at 80 MHz with a Varian FT-80A NMR spectrometer. Samples (0.5 mL) were prepared in deutero-chloroform at concentrations of 10-25% by weight. Tetramethyl-silane (TMS) was used as an internal reference. Chemical shifts... 

Figure 8. A, A 360-MHz proton NMR spectrum of camphor, 2 M in deutero-chloroform B and C, A 55-MHz natural-abundance NMR spectrum of the same sample with (B), and without (C) proton broadband decoupling.

Solvent deutero chloroform internal standard tetramethylsilane (r = 10.00). S = singlet, D — doublet, T = triplet, Q = quartet. 

Eq. (2.6). Huntress applies this equation to deutero-chloroform and 2 35... 

The microstructure of polybutadiene was studied via IR spectroscopy on a Shimadzu IR Prestige spectrometer. Analysis was performed with the use of polymer films applied on KBr glasses. The films were cast from toluene solutions. The microstructure of polyisoprene was studied via H NMR spectroscopy on a Bruker AM-300 spectrometer. Deutero chloroform was used as a solvent. 

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