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  • ASTROPHYSICS  (1,145)
  • Analytical Chemistry and Spectroscopy  (902)
  • 1985-1989  (2,047)
  • 1986  (2,047)
Collection
Keywords
Publisher
Years
  • 1985-1989  (2,047)
Year
  • 1
    Electronic Resource
    Electronic Resource
    13C and 125Te chemical shifts in ortho-substituted tellurophenetoles (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 362-363 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Indirect evidence is provided for (a) the existence of an interaction between the Te d-orbitals and the oxygen lone pair in COR and NO2 substituted compounds and (b) the Δδ(77Se) ≍ 0.6 Δδ(125Te) relationship.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240419
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  • 2
    Electronic Resource
    Electronic Resource
    13C and 15N nuclear magnetic resonance studies of selected tetrazoles: Relationships with the chemistry of tetrazoles (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 984-994 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; 15N NMR ; Sodium tetrazolates ; tetrazoles ; bitetrazoles ; cobalt(III)tetrazole complexes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Natural abundance 13C and 15N nuclear magnetic resonance studies have been carried out on a series of sodium tetrazolate salts, 1,5- and 2,5-disubstituted tetrazoles, bitetrazoles, and cobalt(III) tetrazolate complexes of the type (PBu3n)Co(DH)2(5-R-tetrazolate), where DH is the monoanion of dimethylglyoxime. The 15N chemical shifts have been analysed with respect to structure, substituent effects, electron density as determined by molecular orbital calculations, Brønsted acidity, Lewis basicity and nucleophilicity of the nitrogen atoms in the ambidentate tetrazoles.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260241111
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  • 3
    Electronic Resource
    Electronic Resource
    13C and 17O NMR of some substituted oxiranes. Chemical shifts and quantitative correlations (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 15-20 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements of the 13C and 17O chemical shifts of mono- and di-substituted oxiranes [CH3, C6H5, CH=CH2 and C(CH3)=CH2 substituents] allowed the determination of the direct additivity parameters, which depend solely on the nature of the substituent, and the cross terms due to pairwise contributions of the substituents. Pairwise interactions have been ascribed either to electron transfer between the epoxide ring and the substituent, or to steric interactions between the different substituents. A systematic study of oxiranes polysubstituted by methyl, phenyl, vinyl and isopropenyl groups allows a simple interpretation to be proposed for deviations between the theoretical results and the experimental values in most cases. A striking feature of the data is the possibility of distinguishing between different molecular configurations for isomeric compounds by 17O NMR.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240106
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  • 4
    Electronic Resource
    Electronic Resource
    13C and 1H NMR spectral studies of some piperidin-4-one oximes (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 312-316 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR spectra have been recorded for eleven piperidin-4-one oximes and for seven of them 1H NMR spectra have been recorded at 270 MHz. The effect of oximation on the NMR chemical shitts is discussed. The conformations of the oximes are also discussed, based on the observed chemical shifts. Although several oximes appear to adopt a chair conformation, in the same manner as the corresponding ketones, the oximes of 3,5-dimethyl-2,6-diarylpiperidin-4-ones with cis-methyl groups seem to adopt an asymmetric non-chair conformation. Analysis of the chemical shifts of cis-2,6-dimethylcyclohexanone oxime suggests that this compound also exists in a non-chair conformation, and not in a chair conformation with two axial methyl groups as suggested previously.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240409
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  • 5
    Electronic Resource
    Electronic Resource
    13C and 1H two-dimensional NMR characterization of the sodium perchlorate complex of a new tetraoxatetraaza lipophilic cage ligand (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 692-698 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 1H NMR characterization of the sodium perchlorafe complex of a new tetraoxatetraaza lipophilic cage ligand (1) derived from 1,7-dioxa-4,10-diazacyclododecane has been performed. 1H homonuclear correlated and 1H J-resolved two-dimensional experiments allowed the recognition of resonances due to different types of OCH2CH2N fragments, and of those of the hydrogens of the bridging chains. 13C resonances have been assigned on the basis of a 13C—1H heteronuclear correlated two-dimensional experiment, together with the 13C NMR spectra of the synthetic precursors of 1. 13C spin-lattice relaxation times and NOE measurements established that the unique relaxation mechanism is dipole-dipole; the calculated rotational correlation times indicated that molecular reorientation is isotropic. 13C spectra and relaxation times obtained in different solvents showed that specific solute-solvent interactions are absent.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240813
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  • 6
    Electronic Resource
    Electronic Resource
    13C and 31P NMR spectra of 1-diethylphosphono-1-hydroxycycloalkanes (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 360-361 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 31P NMR chemical shifts and 13C-31P couplings are reported for a series of thirteen 1-diethylphosphono-1-hydroxycycloalkanes and their alkyl derivatives with carbocyclic ring sizes varying from four to twelve.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240418
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  • 7
    Electronic Resource
    Electronic Resource
    13C and proton nuclear magnetic resonance spectra of trans-[arylbromobis(triethyl phosphine)palladium(II)] and related compounds. The π-donor ability of the Ni(PEt3)2X, Pd(PEt3)2X and Pt(PEt3)2X groups (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 243-246 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR ; 1H NMR ; Ni-Pd-Pt series ; Ni-Pd-Pt substituent effects ; Ni/Pd/Pt-induced paramagnetic shifts ; M(PEt3)2X substituents ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and proton NMR spectra of several arylpalladium and some arylnickel and arylplatinum complexes have been compared. The Ni(PEt3)2X and Pd(PEt3)2X substituents induce a paramagnetic shift of Cipso (of the phenyl ring) which is much larger than that induced by Pt(PEt3)2X. However, there are no significant differences along the Ni/Pd/Pt series for the ortho, meta and para positions. For the six compounds of general formula trans-[ArPdBr(PEt3)2] reported here, the mean Δ(δ)C values induced on the ArH by the introduction of the PdBr(PEt3)2 substituent are found to be 26.9 (Cipso), 7.2 (Cortho), -1.1 (Cmeta), -5.5 (Cpara), -0.03 (Hortho), -0.28 (Hmeta) and -0.38 ppm (Hpara).
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240311
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  • 8
    Electronic Resource
    Electronic Resource
    13C chemical shifts and 13C—13C coupling constants of some alkyl(aryl)sulphonates (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 648-649 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C resonances of sodium n-octylsulphonate, octylbenzene-sulphonate and 4-dodecylbenzenesulphonate in aqueous solutions have been assigned, either physically by selective detection of their 13C satellites, or by comparison. Some one-bond carbon-carbon couplings have been accurately determined.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240717
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  • 9
    Electronic Resource
    Electronic Resource
    13C chemical shifts of chlorinated biphenyls (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 1013-1014 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of 48 chlorinated biphenyls are presented. The 13C shifts of the individual carbons are interpreted by the additive contributions from the substituent effect of a chlorine atom, and by the repulsive interaction of chlorine atoms substituted in a crowded relationship on the biphenyl ring.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260241116
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  • 10
    Electronic Resource
    Electronic Resource
    13C NMR and lanthanide-induced shifts in epoxides of Terpenes and related compounds (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 718-722 
    Details
    ISSN: 0749-1581
    Keywords: Epoxidation induced ; 13C NMR shifts ; Lanthanide induced shifts ; Epoxides ; Alkanes ; Alkenes ; Terpenes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Based on literature data, and new measurements with both simple and complicated skeletons, it is shown that epoxidation-induced shifts (EIS) usually vary by only 〈4ppm if compared with the corresponding olefins, but by 〈9 ppm if compared with the saturated analogues. Shift differences between stereoisomers (E/Z or trans/cis) are consistent and, again, similar in epoxides and olefins. Larger variations are observed only for cyclic systems in which flexibility and conformational coupling can lead to significant conformational differences between the epoxide and olefin. Yb(fod)3-induced LIS values are regular if normalized by setting the LIS for the α-carbon atoms to 100%; these and the EIS values can be used to confirm or correct13C signal assignments.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240818
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