1. |
Correction and addition |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 5-5
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ISSN:0030-4921
DOI:10.1002/mrc.1270080316
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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2. |
Atlas of carbon‐13 NMR data, volume 1, by E. Breitmaier, G. Hass and W. Voelter,Heyden and Son, London, 1975. £17·50, $42.00, DM 120.00 |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 7-7
R. J. Abraham,
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ISSN:0030-4921
DOI:10.1002/mrc.1270080317
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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3. |
News and events |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 8-8
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ISSN:0030-4921
DOI:10.1002/mrc.1270080318
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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4. |
15N nuclear magnetic resonance spectroscopy. Natural abundance15N NMR of monosubstituted indoles |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 117-119
E. Rosenberg,
Kenneth L. Williamson,
John D. Roberts,
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摘要:
Abstract15N chemical shifts of twenty‐four substituted indoles have been determined in natural abundance (in organic solvents) using Fourier transform NMR. The overall chemical shift range is 27 ppm, with groups in the 2‐, 3‐ and 5‐ring positions showing the largest substituent effects. Substituents capable of resonance interaction with the indole nitrogen give shifts in the expected directions but they cannot be correlated with known substituent parameters. Compounds measured in DMSO give 0·2 to 10·2 ppm downfield shifts with respect to the same compound measured in CDCl3.13C NMR data for previously unreported compounds are also
ISSN:0030-4921
DOI:10.1002/mrc.1270080302
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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5. |
Amines α et β acétyléniques. CouplagesJ(15NH),J(15N13C) et hybridation de l'azote |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 120-125
T. Bottin‐Strzalko,
M. J. Pouet,
M. P. Simonnin,
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摘要:
AbstractLes trois amines15N‐méthylaniline,15N‐méthylphénylpropargylamine et15N‐méthylphénylpropynylamine ont été étudiées par RMN du1H et13C. Les grandeurs des couplages1J(15N13C sp 3) et1J(15N13C sp 2) indiquent que l'hybridation de l'azote est intermédiaire entresp3etsp2dans le15N‐méthylaniline et la15N‐méthylphénylpropargylamine mais estsp2dans l'amine α‐acétylénique. La valeur du couplage1J(15N13Csp), calculée à l'aide de la relation de Binsch, est plus faible que la valeur expérimentale, ce qui suggère que les mécanismes orbitalaire et dipolaire apportent
ISSN:0030-4921
DOI:10.1002/mrc.1270080303
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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6. |
Azobilirubin isomers: NMR structure determination using a shift reagent |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 126-128
Manuel Salmón,
E. Díaz,
M. C. Rock,
Catherine Fenselau,
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摘要:
AbstractThe isomeric benzeneazodipyrromethene derivatives, obtained from the reaction of bilirubin and a phenyldiazonium salt were separated as their corresponding methyl esters. The lanthanide‐induced chemical shifts, coupling constants and double irradiation experiments permit direct assignment of methyl and vinyl substituent positions in these bilirubin‐derived isom
ISSN:0030-4921
DOI:10.1002/mrc.1270080304
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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7. |
Chemically‐induced dynamic nuclear polarisation. Photoreactions of organomercury compounds |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 129-131
F. J. J. de Kanter,
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摘要:
AbstractThe photolysis of symmetric and asymmetric organomercury compounds has been studied by CIDNP. No indications of the existence of RHg· radicals have been found. Depending on the solvent, reactions occur from excited states with different spin multiplicities
ISSN:0030-4921
DOI:10.1002/mrc.1270080305
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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8. |
Dynamic NMR: A new intensity ratio for evaluation of lifetime in paripartite A ⇌ B systems |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 132-136
Valentin S. Dimitrov,
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摘要:
AbstractA simple formula for evaluation of rates of exchange in paripartite A ⇌ B systems is introduced. It is concerned only with the intensity ratio in a two‐site system in much the same way as that of Rogers and Woodbrey, but the new formula is also applicable above the coalescence point of the spectrum. The formula has been applied to the classical case ofN,N‐dimethyltrichloroacetamide. An error analysis demonstrates that the approximations inherent in the derivation of the new formula lead to smaller errors than do those of Rogers and Woo
ISSN:0030-4921
DOI:10.1002/mrc.1270080306
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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9. |
Proton magnetic resonance spectra of monosubstituted naphthalenes |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 137-140
Vittorio Lucchini,
Peter R. Wells,
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摘要:
AbstractThe chemical shifts and coupling constants for the ring protons of fourteen monosubstituted naphthalenes in carbon tetrachloride solution have been obtained by analysis and computer simulation of their 100 MHz magnetic resonance spectra. Studies at several concentrations have enabled shifts extrapolated to infinite dilution to be obtained and concentration effects arising from solute–solute interactions to be determine
ISSN:0030-4921
DOI:10.1002/mrc.1270080307
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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10. |
NMR‐Untersuchungen über inter‐ und intramolekulare Wechselwirkungen in substituierten Trifluormethylphenylisocyanaten, Fluorphenylisocyanaten, in Fluoranilin und Fluornitrobenzol |
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Organic Magnetic Resonance,
Volume 8,
Issue 3,
1976,
Page 141-146
R. Kosfeld,
L. Henke,
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摘要:
AbstractDie chemischen Verschiebungen der Fluor‐ und Protonensignale substituierter Trifluormethylphenylisocyanate, Fluorphenylisocyanate, des Fluoranilins und des Fluornitrobenzols werden in Abhängigkeit von der Probentemperatur und der Konzentration des Lösungsmittels Tetrachlorkohlenstoff ermittelt. Der Temperatureinfluß auf die chemischen Verschiebungen der Fluorsingaleortho‐substituierter Trifluormethylphenylisocyanate wird von der intramolekularen Wechselwirkung zwischen den Trifluormethylgruppen und denortho‐Substituenten bestimmt, die zu einem Anstieg der chemischen Verschiebungen mit zunehmender Temperatur führt.Die Temperaturabhängigkeit der Elektronenverteilung innerhalbmeta‐ undpara‐substituierter Trifluormethylphenylisocyanate ist hauptsächlich auf intermolekulare Wechselwirkungen zurück‐zuführen, die eine Abnahme der chemischen Verschiebungen der Fluorsignale mit steigender Probentemperatur verursachen.Da sich die Protonen der untersuchten Substanzen an der ‘molekularen Oberfläche’ befinden, ist der van der Waals‐Effekt für die Temperaturabhängigkeit der chemischen Verschiebungen der Protonensignale bestimmend. Das Lösungsmittel Tetrachlorkohlenstoff verursacht mit zunehmender Konzentration infolge einer Schwächung des Anisotropie‐Effektes einen Anstieg der chemischen Verschiebungen der Fluor‐ und Protonensig
ISSN:0030-4921
DOI:10.1002/mrc.1270080308
出版商:John Wiley&Sons Limited
年代:1976
数据来源: WILEY
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