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  • 1
    Electronic Resource
    Electronic Resource
    Structure of two stereoisomers of Pt(trans-MeO2CCH=CHCO2Me)2[P(cyclohexyl)3]: Complete assignment of the 11 non-equivalent tricyclohexylphosphine protons using DQF-COSY and 13C, 1H two-dimensional methods (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 113-119 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; DQF-COSY ; C,H inverse correlation ; Tricyclohexylphosphine ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H NMR spectrum of the Pt(0) complex Pt(trans-MeO2CCH=CHCO2Me)2[P(cyclohexyl)3] was measured and the structures of the two isomeric forms, which differ with respect to olefin coordination, were assigned. The structural study made use of a complete analysis of the 11 non-equivalent protons of the P(cyclohexyl)3 in one isomer, and this was accomplished via DQF-COSY and 13C,1H inverse heteronuclear correlation methods.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290204
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  • 2
    Electronic Resource
    Electronic Resource
    Structural elucidation of germine esters isolated from Veratrum nigrum L. Total assignment of 1H and 13C nuclear magnetic resonances by two-dimensional NMR techniques (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 100-112 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; Phase-sensitive DQF-COSY and ROESY ; Heteronuclear 13C-1H long-range correlation ; Steroid alkaloid ; Germine esters ; Anti-hypertension ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The application of two-dimensional phase-sensitive COSY, ROESY and 13C-1H shift correlation spectroscopy in the structural elucidation and stereochemical assignment of the steroidal alkaloids 15-(2-methylbutyryl)germine, 3-(2-hydroxy-2-methylbutyryl)-15-(2-methylbutyryl)germine and 16-(2-methylbutyryl)germine is reported. It is shown that two-dimensional 13C-1H heteronuclear long-range correlation spectroscopy is an invaluable method for the stereochemical assignment of proton resonances which overlap in 1H NMR and homonuclear correlation spectra.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290203
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  • 3
    Electronic Resource
    Electronic Resource
    183W-1H long-range shift correlation and 1H NOESY studies on tungsten(II) hydrido-pyrazolylborate complexes (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 58-62 
    Details
    ISSN: 0749-1581
    Keywords: Tungsten(II) hydrido-pyrazolylborate complexes ; 183W-1H long-range shift correlation ; 1H NOESY ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 183W NMR spectra for several tungsten carbonyl complexes were recorded using heteronuclear multiple-quantum spectroscopy. The measurements involved the use of both one-bond and long-range coupling constants, with the latter technique demonstrating a general approach to obtaining 183W spectra in Tp′ [Tp′ = tris(3,5-dimethylpyrazolyl)borohydride] and Cp tungsten compounds. Differences in the 183W chemical shifts between the Tp′ and Cp complexes are explained in terms of σ-donor and π-acceptor capabilities of the ligands. It is suggested that the very small 1J(183W,1H) value of 7 Hz in WH(Tp′)(CO)3 arises from an interaction of an H+ with a [W(Tp′)(CO)3]- orbital with a relatively large d-component. For WH(Tp′)(CO)(PHC≡CMe) (3), the very lowfield hydride chemical shift, δ = 10.8, is suggested to arise, in part, from anisotropic effects. 1H NOESY measurements on 3 show that the hydride lies in a deshielding region with respect to both the acetylene and two pyrazolylborate rings, the acetylene is bent such that the CH3 and Ph groups move toward one another and there is a second isomer of 3, presumably related to the geometry of the coordinated acetylene with respect to the W—C≡O bond.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310112
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  • 4
    Electronic Resource
    Electronic Resource
    Two-dimensional NMR studies of Pt(2-methallyl)(SnCl3)(styrene). Recognition and interpretation of simultaneous exchange processes via 1H noesy (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 355-359 
    Details
    ISSN: 0749-1581
    Keywords: 2D NMR ; π-Allyl ; Ligand exchange ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1H NMR spectrum of Pt[η3-CH2C(CH3)CH2](SnCl3)(PhCH=CH2) (1), which is complicated by the existence of two isomers, has been interpreted using (195Pt, 1H)-INVERSE, J-resolved, COSY-90 and NOESY two-dimensional methods. The two isomers are shown to be involved in slow exchange processes, and one intermediate in the exchange, Pt[CH2C(CH3)CH2](SnCl3)33- (4), has been identified and characterized via 1H, 13C, 119Sn and 195Pt spectroscopy. NOESY measurements show that neither 1 nor 4 is involved in an η3 →η1 isomerization, so that 4 must be involved in the dynamics with 1 via loss of a tin-containing fragment, presumably SnCl3-. Uncoordinated PhCH=CH2 has been detected in solution and shown to exchange with the complexed PhCH=CH2 in both isomers of 1.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260270411
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