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  • 1
    Electronic Resource
    Electronic Resource
    Intrinsic ASIS of the methyl protons of camphor (1985)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 899-902 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intrinsic ASIS of the C-8, C-9 and C-10 methyl protons of camphor in 14 hydrocarbon solvents have been calculated using intrinsic ASIS values of the TMS protons. The intrinsic ASIS of the methyl groups show excellent correlation among themselves and, therefore, can be factored into independent solute and solvent factors UiVα. The solute factors, Ui, depend on the position of the methyl group with respect to the polar carbonyl group. The solvent factors, Vα, correlate with the benzene ring concentration of the aromatic solvents measured by d/M, which is in accordance with a general solvation mechanism but not with the formation of specific solute-solvent complexes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260231104
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  • 2
    Electronic Resource
    Electronic Resource
    Optimization of sample deposition for plasma-desorption mass spectrometry of peptidoglycan monomers (1992)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 6 (1992), S. 284-288 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Three selected peptidogycan monomers isolated from muramidase-digested Escherichia coli-sacculus were characterized by positive- and negative-ion 252Cf plasma-desorption mass spectrometry (PDMS). Dut to the high affinity of sugar moieties towards alkali cations multiple alkali attachment in PDMS can be a problem. Electrospray, nitrocellulose, nitrocellulose sandwich anthracene-9-carboxylic acid 3-(3-Pyridyl)acrylic acid deposition techniques were evaluated for the degree of (de)proltonation and cationization of the molecular species by sodium and/or potassium. Electrosprayed and nitrocellulose-deposited samples mainly exhibited intense cationized molecular ion species whereas anthracene-9-caboxylic acid-deposition sample show a similar pattern but with much lower intensity. An extension of the nitrocellulose deposition technique, the so-called nitrocellulose sandwich sample preparation reduced the aallkali attachment problem for these hydrophilic compounds. Application of the small molecule matrix 3-(3-pyridyl)acrylic acid yielded mass spectra with abundant [M+H]+ and [M—H]- ions in the positive- and in the negative-ion modes, respectively.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290060412
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  • 3
    Electronic Resource
    Electronic Resource
    Study of the intrinsic and conformational solvent effects on the chemical shift of the aldehydic proton in furfural and thiophenealdehyde (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 525-527 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical shifts of the aldehydic proton in furfural, thiophenealdehyde and benzaldehyde have been measured in fourteen solvents. The correlation of the chemical shifts of thiophenealdehyde and benzaldehyde is excellent (r = 0·996) while it is lower for furfural-benzaldehyde (r = 0·956). The long range coupling constant Jα5 of furiurai has been measured in twelve solvents and the rotameric mole fractions determined. The chemical shifts of individual rotamers are calculated and shown to correlate with benzaldehyde, (r = 0·992; 0·993). Only one rotamer is predominant for thiophenaldehyde in all solvents. The intrinsic solvent effects of the three aldehydes are similar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270061004
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  • 4
    Electronic Resource
    Electronic Resource
    Detection of halogen bond formation by correlation of proton solvent shifts. 1. Haloforms in n-electron donor solvents (1979)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 12 (1979), S. 92-94 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solvent shifts of haloformic protons, (Cl3CH, Br3CH, I3CH), have been measured in 24 n-electron donor solvents consisting of halogenated hydrocarbons, esters, ketones, ethers and amines. Deviations of ΔBr and Δ1 from linear dependence with ΔCl are indicative of the presence of halogen bond formation competitive with hydrogen bonding interactions. Bromoform interacts predominantly by hydrogen bonding, halogen bonding being detected to a small extent in chlorinated hydrocarbons and amines. Iodoform shows halogen bonding interactions which increase in relative importance to hydrogen bonding with solvent basicity. Halogen bonding is predominant for solutions of iodoform in amines.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270120210
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of halogen bond formation by correlation of proton solvent shifts. II - methylene halides in n-electron donor solvents (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 244-246 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solvent shifts of the methylenic protond of CH2Cl2, CH2Br2 and CH2I2 have been measured in amines, ethers and non-polar solvents. Correlation of the solvent shifts of the bromine and iodine compounds ΔCl, serves as a monitor of halogen bonding interactions which are competitive with hydrogen bonding association. Amines interact with CH2I2 via a halogen bond while in ethers hydrogen bonding predpminates. CH2Br2 shows solute-solvent interactions identical to CH2Cl2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140404
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  • 6
    Electronic Resource
    Electronic Resource
    Preferential site of solvation of the furan ring in acidic solvents (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 16 (1981), S. 82-84 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study of the correlation of solvent effects on the chemical shifts of the methyl protons of sylvan, toluene and α-picoline led to the conclusion that the preferential site of solvation of the furan ring in acidic solvents is the π-electron cloud and not the n-electron orbital of the oxygen atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270160203
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of the internal reference on ASIS correlations: 1 - Formyl protons of p-X-benzaldehydes (1983)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 21 (1983), S. 2-5 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The correlation of the ASIS of the formyl protons of benzaldehyde and six of its p-X-derivatives in 12 aromatic solvents show marked deviations. Evidence is presented that these deviations are caused by variations in the shielding of the internal reference protons caused by aromatic solvents. Equations are developed which gauge the effect of TMS on the linear correlations of proton ASIS.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/omr.1270210103
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of the internal reference on ASIS correlations: 2 - The intrinsic ASIS of TMS protons in aromatic hydrocarbon solvents (1983)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 21 (1983), S. 6-10 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is developed to calculate the intrinsic ASIS of TMS protons used as internal reference, based on linear correlation of the ASIS of a group of sensor protons in two fixed aromatic solvents. Several solute systems (p-X-benzaldehydes, camphor, α-Br-camphor, 5-X-furfurals, p-X-acetophenones and methyl ketones) are used to calculate a series of intrinsic ASIS values of TMS in 12 aromatic hydrocarbon solvents. The Δα TMS values are used, in turn, to calculate the intrinsic ASIS of CHO protons in dimethylformamide and diphenylformamide, and of the CH3 protons in diethyl ether and diisopropyl ether.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/omr.1270210104
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of the internal reference on ASIS correlations: 3For part 2 see Org. Magn. Reson. 21, 6 (1983). - Intrinsic ASIS of formyl protons (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 63-66 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intrinsic ASIS of formyl protons in p-X-benzaldehydes, dimethylformamide and diphenylformamide in a series of aromatic hydrocarbon solvents have been calculated. These values of Δ¯xα of the formyl protons present excellent correlations in aromatic hydrocarbon solvents, and are factorizable into solute and solvent factors Ux and Vα, respectively. The Ux values are linearly related to the value of σp of the substituent in the solute. The Vα values depend on the substitution pattern of the benzene ring of the solvent molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220202
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  • 10
    Electronic Resource
    Electronic Resource
    Complexation of hydroxylated ent-kaurane diterpenoids with boric acid as an aid to the assignment of the 13C NMR spectra (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 515-520 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of some hydroxylated ent-kaurane diterpenoids were measured in CDCl3-Py-d5 (1:1) solution and also after addition of boric acid. Complexation of ent-3β,18-, ent-7α,15β-, ent-7α,15α-, ent-15β,16β- and ent-16β,17-dihydroxy derivatives with boric acid produced considerable chemical shift changes and marked broadening of the signals of the hydroxy-bearing and neighbouring carbon atoms. This behaviour provides a useful and reliable method for assigning the 13C NMR spectra of these compounds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220809
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