ISSN:0030-4921    

DOI:10.1002/mrc.1270050515

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

ISSN:0030-4921    

DOI:10.1002/mrc.1270050516

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractLes constantes de couplage RMN3J,4Jet5Jentre protons ont été calculées par les deux méthodes citées, pour le cyclohexane et pour les conformères de ses dérivés monosubstitués (substituants: Li, CH3, OH, F). La comparaison des deux méthodes sur la base de la théorie des groupes met en évidence la nécessité d'utiliser la méthode des perturbations finies dont les résultats sont confrontés avec les données expérimentales

ISSN:0030-4921    

DOI:10.1002/mrc.1270050502

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractThe hydroxyl proton chemical shifts of β‐dicarbonyl compounds involving various β‐substituents have been studied. An additive influence of β‐substituents on the δOHshift values has been found. The results obtained suggested the existence of only one potential proton energy minimum in the intramolecular hydrogen bond of the enol forms of the β‐diketones. It has been shown that the enol forms of β‐keto esters do not follow the additivity of the δOHvalues for the same substituents, which may be due to a change in the proton distribution potential function in the intramolecul

ISSN:0030-4921    

DOI:10.1002/mrc.1270050503

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractLe complexe Eu (FOD)3constitue un bon réactif de déplacement en spectroscopie de RMN de Δ1‐pyrazolines. Les 5 exemples décrits ici ont été choisis en série polycyclique pour mettre en évidence l'utilité de cette technique en vue de l'attribution des st

ISSN:0030-4921    

DOI:10.1002/mrc.1270050504

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractThe CIDNP effects observed during thermal decomposition of 2‐hydroperoxide‐2‐methyltetrahydrofuran at 150° in C6H5COH are described.AnA/Emultiplet effect is observed on the CH3‐propyl protons of the propylacetate formed as a result of decyclisation of the methylfuryl

ISSN:0030-4921    

DOI:10.1002/mrc.1270050505

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractDans les anilines une non équivalence des protons aminés, due à la rotation empêchée autour de CN apparait à basse température. Les relations entre les paramètres d'activation et les effets électroniques des substituants sont étudiés et les paramètres RMN

ISSN:0030-4921    

DOI:10.1002/mrc.1270050506

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

Abstract13C CIDNP effects in the decomposition of acetylbenzoyl peroxide in cyclohexanone are described. A comparison between our data, and those on the1H CIDNP effects and the13C CIDNP observed in the decomposition of ABP in C2Cl41leads to definite conclusions on the signs of the HFI constants of the benzoyl radical and to an identification of the separate products of the radical‐induced reactions with the solven

ISSN:0030-4921    

DOI:10.1002/mrc.1270050507

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractThe PMR spectra of several cyclic and acyclic dipeptide derivatives representing portions of the actinomycin structure have been studied. In the spectra of the acyclic compounds temperature‐dependent duplicity resulted from the equilibration of conformers possessingcisandtranspeptide bonds. The lanthanide shift reagent Eu(FOD)3was utilized to distinguish N‐methyl groups in the two conformations and observations were made on the steric dependence of the observed shifts. The origin of the wide variation in chemical shift of N‐methylvalyl α‐protons is discussed in relation to the conformation of act

ISSN:0030-4921    

DOI:10.1002/mrc.1270050508

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY

摘要:

AbstractFrom13C‐7 labeled toluene the following13C‐methylo‐ andp‐substituted toluenes were synthesized:o‐NO2, ‐NH2, ‐I and CN;p‐NO2and ‐NH2. Each of these labeled compounds was studied by carbon magnetic resonance to determine all carbon‐13carbon‐13 splittings in

ISSN:0030-4921    

DOI:10.1002/mrc.1270050509

出版商:John Wiley&Sons Limited    

年代:1973

数据来源: WILEY