1. |
Forthcoming papers |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 5-5
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ISSN:0030-4921
DOI:10.1002/mrc.1270060515
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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2. |
News and events |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 9-10
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ISSN:0030-4921
DOI:10.1002/mrc.1270060516
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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3. |
Nuclear magnetic resonance spectra of pyrido‐ and azapyridocyanines |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 253-258
Ingo H. Leubner,
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摘要:
AbstractThe nuclear magnetic resonace spectra of six pyridocyanines, four azapyridocyanines, one monoquaternized 2,4′‐dipyridylamine and two dipyridylamines were measured and fully analyzed. The spectra of the 2,2′‐pyrido‐ and azapyridocyanines support previously published results that these dyes exist in the all‐transform and not in the mono‐cisform, as stated by others. Strong evidence was obtained thatN,N′‐ethylene‐2,2′‐pyridocyanine is twisted. The spectra of dyes withp‐connected pyridine rings indicate that these nuclei may rotate around the bond between themesogroup and thep‐position. Relative chemical shifts in the spectra of the homologous pyrido‐ and azapyridocyanines can be explained by electronic effects rather than by magnetic anisotropy of the aza grou
ISSN:0030-4921
DOI:10.1002/mrc.1270060502
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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4. |
Utilisation de la RMN a champs forts dans la série du norbornène: triméthylsilyl‐endo‐3 bicyclo (2.2.1) heptène‐5 |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 259-263
R. Gassend,
Y. Limouzin,
J. C. Maire,
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摘要:
AbstractLa RMN à 250 et à 300 MHz combinée à des expériences de double irradiation de type classique ou INDOR a été utilisée pour établir sans ambiguité la structureendod'un triméthylsilyl‐3 norbornène‐5. Les déplacements chimiques et les constantes de couplage ont été très exactement déterminés, des couplages à longue distance n'obéissant pas à la ‘règle d
ISSN:0030-4921
DOI:10.1002/mrc.1270060503
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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5. |
The NMR identification of the ring A protons of C‐3 oxygenated steroids using the lanthanide paramagnetic shift technique |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 264-266
Oscar R. Rodig,
Peter P. Roller,
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摘要:
AbstractThe lanthanide induced chemical shifts and coupling constants have been determined for ring A protons of steroids having a keto, hydroxyl, or acetate functional group at C‐3. The assignments were made with the aid of suitably deuterated compounds and should prove useful in steroidal stereochemical and conformational studie
ISSN:0030-4921
DOI:10.1002/mrc.1270060504
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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6. |
Etude par RMN à haut champ des monofluoroanilines |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 267-268
A. Forchioni,
C. Chachaty,
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摘要:
AbstractL'analyse des spectres RMN à 250 MHz des monofluoroanilines complexées par du Pr(FOD)3a permis de déterminer avec précision les constantes de couplagesJ(HH) etJ(FH) de ces composés. La validité des attributions a été contrôlée en reconstituant les spectres par calcul él
ISSN:0030-4921
DOI:10.1002/mrc.1270060505
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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7. |
Ring strain effects: VI—benzocyclobutadienoquinone radical anion |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 269-271
Reuben D. Rieke,
David G. Westmoreland,
Loretta I. Rieke,
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摘要:
AbstractElectron paramagnetic resonance studies were carried out on the radical anion of 4‐deuterobenzocyclobutadienoquinone. The hyperfine coupling constants which had been assigned previously were found to be in error. The effects of the strained 4‐membered ring on the spin density distribution are discus
ISSN:0030-4921
DOI:10.1002/mrc.1270060506
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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8. |
Etudes RMN en série hétérocyclique—XIII:Spectres des azoles dans l'acide sulfurique |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 272-275
José Elguero,
Alain Fruchier,
Maria del Carmen Pardo,
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摘要:
AbstractLes spectres RMN du benzimidazole, de l'indazole, du phényl‐1 imidazole, du phényl‐1 pyrazole et de certains de leurs dérivés méthylés, ont été étudiés dans l'acide sulfurique en vue de déterminer les couplages avec les protons portés
ISSN:0030-4921
DOI:10.1002/mrc.1270060507
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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9. |
Ionen. X—Das Tetraphenyloborat‐Ion als Hilfsmittel bei Diastereotopie‐Problemen |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 276-278
G. P. Schiemenz,
P. Klemm,
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摘要:
Abstract[B(C6H5)4]⊖ ist ein leistungsfähiges NMR‐Verschiebungsreagens für Aminosulfonium‐Kationen. In einem Beispiel zeigen diastereotope Protonen unter normalen Meßbedingungen (Chlorid in CDCl3) keine Anisochronie. Diese wird durch einen Solvenseffekt sichtbar, jedoch nur in einem Maße, das die geminale Kopplungskonstante und die wahren Signallagen noch nicht zu ermitteln gestattet. [B(C6H5)4]⊖ erzeugt jedoch annähernd ein Spektrum erster Ordnung, dem alle Parameter glatt entnommen werden können. Die Daten helfen im Chlorid‐Spektrum sehr schwache Signale aufzuspüren und das Ausmaß der Anisochronie festzustellen. Salzmischungen legen verde
ISSN:0030-4921
DOI:10.1002/mrc.1270060508
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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10. |
Solvent effects on the proton magnetic resonance spectra of thio‐ and dithio‐oxamides |
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Organic Magnetic Resonance,
Volume 6,
Issue 5,
1974,
Page 279-283
J. A. Lepoivre,
H. O. Desseyn,
F. C. Alderweireldt,
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摘要:
AbstractThe chemical shifts of theN‐methyl signals for a number of thio‐oxamide and oxamide derivatives are unambiguously determined in the solvents chloroform, carbon tetrachloride, benzene, chlorobenzene,o‐dichlorobenzene and nitrobenzene. The ASIS effect is discussed. The temperature dependence of the absolute shift and of the relative shift differences of both methyl groups of theN,N‐dimethyl derivatives are
ISSN:0030-4921
DOI:10.1002/mrc.1270060509
出版商:John Wiley&Sons Limited
年代:1974
数据来源: WILEY
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