|
1. |
Forthcoming papers |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 6-6
Preview
|
PDF (96KB)
|
|
ISSN:0030-4921
DOI:10.1002/mrc.1270050409
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
2. |
Magnetic resonance, Invited Lectures presented at the IVth International Symposium on Magnetic Resonance, Rehovot, Israel, 23rd to 31st August 1971, edited by D. Fiat,Butterworths, London, 1973, pp. 339. £ 11.00 |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 10-10
R. J. Abraham,
Preview
|
PDF (133KB)
|
|
ISSN:0030-4921
DOI:10.1002/mrc.1270050410
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
3. |
Annual reports on N.M.R. spectroscopy. Volume 5A. Edited by E. F. Mooney,Academic Press, London and New York, 1972. pp. xii + 696. £13.00 |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 11-11
J. E. Page,
Preview
|
PDF (127KB)
|
|
ISSN:0030-4921
DOI:10.1002/mrc.1270050411
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
4. |
Etude de la Barrière de Rotation et du Couplage5Jd'α‐Formylpyrroles Stériquement Encombrés |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 165-168
C. Jaureguiberry,
M. C. Fournie‐Zaluski,
B. Roques,
S. Combrisson,
Preview
|
PDF (371KB)
|
|
摘要:
AbstractLes α‐formylpyrroles substitués sur l'azote par des groupements d'encombrement croissant ne montrent aucune modification sensible dans la valeur du couplage stéréospécifique5J. Dans les i.Pr‐1 et s.Bu‐1 formyl‐2 pyrroles on met en évidence l'existence d'une conformation préférentielle plane. L'examen des barrières de rotation des dérivés étudiés indique une torsion dans le seul cas du t.Bu‐1 formyl‐2 pyrrole. L'absence de modification de la valeur du couplage5Jdans ce dernier composé est interprêtée par un relais du mécanisme
ISSN:0030-4921
DOI:10.1002/mrc.1270050402
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
5. |
Transmission of substituent effects in 1,2,3‐selenadiazole derivatives—I |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 169-177
G. A. Caplin,
Preview
|
PDF (947KB)
|
|
摘要:
AbstractChemical shifts are reported for the heterocyclic ring hydrogen of a series ofpara‐substituted 4‐aryl‐1,2,3‐selenadiazoles and substituent effects are evaluated statistically by means of the Swain‐Lupton multiple correlation analysis. A satisfactory understanding of the various substituent effects is obtained by this approach. Excellent correlations were obtained for a number of varying aliphatic solvents, no serious hindrances to correlation being encountered. An approach was also made towards an understanding of aliphatic‐ and aromatic‐induced solvent shifts, as far as these are modified by
ISSN:0030-4921
DOI:10.1002/mrc.1270050403
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
6. |
1H‐NMR‐Spektroskopische Untersuchungen an methylsubstituierten Cyclohexen‐(4)‐dicarbonsäure‐(1,2)‐anhydriden |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 179-186
H. Werner,
E. Kleinpeter,
A. Zschunke,
G. Mann,
Preview
|
PDF (682KB)
|
|
摘要:
AbstractEs wurden die chemischen Verschiebungen und Kopplungskonstanten von methylsubstituierten Cyclohexen‐(4)‐dicarbonsäure‐(1,2)‐anhydriden bestimmt. Die NMR‐Daten beweisen die Bootkonformation dercis‐Anhydride. Die Orientierung descis‐Anhydridringes relativ zum Cyclohexenboot wird durch die Konstitution und Konfiguration der Verbindungen bestimmt und kann von den Kopplungskonstanten und den δ‐Werten der H1‐ und H2‐Protonen abgeleitet werden. Methylgruppen in Nachbarschaft zu diesen Protonen verschieben die Resonanzfrequenzen in Abhängigkeit von der k
ISSN:0030-4921
DOI:10.1002/mrc.1270050404
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
7. |
A comparison of classical and quantum‐mechanical ‘ring‐current’ theories |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 187-189
P. I. Rose,
Preview
|
PDF (238KB)
|
|
摘要:
AbstractThe proton resonance spectra of a series of 2,7‐disubstituted‐4,5‐bis(2‐pyridyl)phenanthrene‐3,6‐diols are examined with emphasis on the shielding effects produced by aromatic ‘ring currents.’ In this series, two pyridine rings are rigidly held less than 3.4 Å apart and with considerable overlap. The ‘ringcurrent’ shieldings found for above‐the‐plane positions are in good agreement with the Johnson‐Bovey theory, whereas a recently proposed quantum‐mechanical theory underestimates the shieldings
ISSN:0030-4921
DOI:10.1002/mrc.1270050405
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
8. |
Über die Struktur der Thioamide und ihrer Derivate—XXIII:14N‐Entkoppelte H‐NMR‐Spektren und Messung der Rotationsbarrieren bei primären Amiden und Thioamiden |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 191-196
W. Walter,
E. Schaumann,
H. Rose,
Preview
|
PDF (708KB)
|
|
摘要:
AbstractDurch Sättigung der14N‐Resonanz lässt sich in den H‐NMR‐Spektren der primären Amide (1abis1d) und der Thioamide (2abis2g) die behinderte Rotation um die CN‐Bindung des (Thio)Amid‐Systems nachweisen. Mit Hilfe von Kopplungskonstanten und der Benzolverdünnungsmethode gelingt es, die Signale der Amino‐Gruppe demcis‐ und demtrans‐NH‐Proton zuzuordnen. Aus der Koaleszenz wird die freie Aktivierungsenthalpie der behinderten Rotation ermittelt und ihre Abhängigkeit von sterischen und elektronischen Effekten sowie vom L
ISSN:0030-4921
DOI:10.1002/mrc.1270050406
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
9. |
Self‐association of thiols. The baggy fit problem in weak complexes |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 197-204
Siung J. Hu,
Sidney I. Miller,
Preview
|
PDF (812KB)
|
|
摘要:
AbstractThe PMR technique has been used to obtain thermodynamic data for hydrogen bonding of alkanethiols (RSH) in 1:1 dimers in carbon tetrachloride. Atca. 303°K these are (R, 104K(M−1), −ΔH°(kcal/mole), −ΔS°(eu)):n‐C3H7, 51 ± 5, 0.9 ± 0.15, 13 ± 1;i‐C3H7, 50 ± 10, 0.8 ± 0.3, 13 ± 1;n‐C4H9, 35 ± 2, 0.8 ± 0.15, 14 ± 1;t‐C4H9, 14 ± 4, 1.1 ± 0.7, 16 ± 2; C6H11, 1.3 ± 2, 0.7 ± 0.3, 15 ± 1. Alkanethiol self‐association is weak, and although an exact expression [Eqn. (5)] reproduces spectral data precisely, the fit is sufficiently ‘loose’ or ‘baggy’ so that values ofK, ΔH° and ΔS° are uncertain. The methodology of the treatment of self‐association data and their errors is examined and Deranleau's useful approach is extended. The impossibility of obtaining reliable data for very weak (90 %) associations by techniques equivalent to ours is emphasized. The possibility of cyclic thiol dimers is discussed. It is suggested that the PMR method cannot give trustworthy self‐association data for aryl or arylalkylthiols because of the relatively large an
ISSN:0030-4921
DOI:10.1002/mrc.1270050407
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
10. |
Diazoalcanephosphonates. Etude par RMN du proton de la configuration de Δ1‐pyrazolines dérivées du norbornadiène |
|
Organic Magnetic Resonance,
Volume 5,
Issue 4,
1973,
Page 205-208
Huguette Cohen,
Claude Benezra,
Preview
|
PDF (394KB)
|
|
摘要:
AbstractLes spectres de RMN de onze pyrazolines1à11dériveés du norbornadiène sont interprétés et discutés. Les configurations des pyrazolines sont déduites du couplagevicinalPCCH10: celui‐ci est de ∼20 Hz dans les dérivésantiet de ∼6,0 Hz dans les dérivéssyn. Le couplage à longue distance P,H9est stéréospécifique, il est m
ISSN:0030-4921
DOI:10.1002/mrc.1270050408
出版商:John Wiley&Sons Limited
年代:1973
数据来源: WILEY
|
|