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The stereochemistry of substituted cyclopent-2-en-1-ones was studied by NMR. The existence of non-planar rings is indicated and conformational analysis, based principally upon examination of the coupling constants enables the conformational population to be estimated; trans dihalogeno derivatives, for example, occur predominantly in the diaxial form. 相似文献
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J. Umemura 《Journal of Molecular Structure》1977,36(1):35-54
Temperature dependence of the IR spectra of crystalline propionic acid were examined in the temperature range 242–50 K. The intensities of most absorption bands increased on lowering the temperature, but some bands diminished until they disappeared at temperatures lower than about 120 K. Normal coordinate analyses indicate that the former bands are due to the stable cis dimer and the latter due to the less stable trans dimer which would be produced from the cis dimer by simultaneous proton transfer along two hydrogen bonds. 相似文献
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Protonation of acylferrocenes (FeCOR) in FSO3H-SO2CIF(SO2) solution was studied by PMR spectroscopy. The site of protonation is found to be at the carbonyl oxygen atom. Temperature dependent PMR spectra of protonated acylferrocenes FeCROH+ (R = CH3, C2H5, C6H5, OCH3) were observed indicating intermolecular hydrogen exchange with the acid solvent system. In addition the PMR spectra of acylferrocenes in FSO3 H-SO2 CIF(SO2) were found to be dependent upon the acid concentration. 相似文献
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R. Lefbvre 《Chemical physics letters》1980,70(3):430-433
The complex rotation method is applied to the determination of widths and shifts of an harmonic oscillator predissociated by a linear potential, for when exact analytical formulas are available in the limit of small interchannel coupling. Excellent agreement is obtained. 相似文献
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1. Prussian blue is soluble in the sodium citrates to form sodium ferrocyanide and sodium ferric citrate. It is much less soluble in disodium citrate than in trisodium citrate, and nearly insoluble in monosodium citrate. 2. Colloidal solutions are formed when the sodium citrates are added to Prussian blue in much smaller quantities than is required to produce a complete solution. 3. The peptizing action of the sodium citrates is explained by the formation of water soluble colloidal sodium ferric ferrocyanide NaFe[Fe(CN)6]. 4. The peptizing action of the potassium oxalates and of the neutral alkali tartrates is also explained by the formation of KFe[Fe(CN)6]. 相似文献
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