ISSN:0030-4921    

DOI:10.1002/mrc.1270060217

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

ISSN:0030-4921    

DOI:10.1002/mrc.1270060202

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractLongrange‐Kopplungen des Typs5J(FH) und6J(FH) werden bei Silanen des Typs (C6F5)nSiR4‐n(n= 1, 2, 3; R = Alkyl, Aryl) sowie den Disilanen C6F5[Si(CH3)2]2R (R = CH3, C6F5) beobachtet. Eine typische Linienverbreiterung der Fluor‐resonanzspektren von (C6F5)nSiR4‐n(n≧ 2) wird auf Spinsysteme des Typs ([AC]2B)nbzw. ([AX]2M)nmit interanularen Kopplungen derortho‐Fluor‐atome benachbarter Ringe

ISSN:0030-4921    

DOI:10.1002/mrc.1270060203

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractL'étude RMN des systèmessyn–antid'oximes cyclaniques figés nous a permis de mettre en évidence une relation entre le déplacement chimique d'un proton voisin du groupement hydroximino et l'angle dièdre constitué par la liaison CH du carbone en α de la fonction et le plan constitué par le groupe NOH. La correlation Δδ =f(angle dièdre), établie par l'étude de modèles conformationnellement connus permet alors d'évaluer les angles dièdres de molécules cycliques dont l'étude géométrique n'avait pas été faite. La géométrie de l'oxime reste identique à celle de la cétone, sauf, toutefois, dans le cas d

ISSN:0030-4921    

DOI:10.1002/mrc.1270060204

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractDie13C‐chemischen Verschiebungen von 6 substituierten Oxepinen wurden vermessen und zugeordnet. Für die mit den entsprechenden valenztautomeren Benzoloxiden im Gleichgewicht stehenden Oxepine1a(unsubstituiert) und1d(2,5‐Dimethyl‐oxepin) wurden die Mittelwertsignale durch ihre Verschiebung bzw. Verbreiterung in Abhängigkeit von der Temperatur bestimmt. Schließlich werden Vergleiche zum Cycloheptatriensystem

ISSN:0030-4921    

DOI:10.1002/mrc.1270060205

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

Abstract13CH satellite NMR spectra have been employed in the analysis of an unknown reaction product. Observation of the deceptively simple1H NMR spectrum did not, in this instance, yield sufficient information for identification of the compound. However, with the aid of the satellite parameters the reaction site became clearly defined and the structure was assigned as α‐(chlorovinyl)‐dichlorophosphine. These unique spectral parameters are discussed and compared to those of similar ethylenic spe

ISSN:0030-4921    

DOI:10.1002/mrc.1270060206

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractThe spectral parameters of the title compounds were redetermined to resolve discrepancies between data reported in the literature.

ISSN:0030-4921    

DOI:10.1002/mrc.1270060207

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractThe structural, solvent and temperature effects on the PMR spectra of several alkyl alkanesulfinates and arenesulfinates are discussed. A low order intrinsic nonequivalence was observed in substituents alpha to the sulfinate sulfur atom, the nonequivalence being significantly less than in sulfoxides, and solvent and temperature dependent. Nonequivalence of diastereotopic substituents on the ester oxygen exceeded nonequivalence in similar sulfoxides and is largely insensitive to temperatures from 25° to 120°C. Benzene complexes with sulfinates greatly enhancing the proton nonequivalence of alpha substituents apparently by causing a further shielding of the already more shielded nonequivalent proton

ISSN:0030-4921    

DOI:10.1002/mrc.1270060208

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractTemperature dependence ofcis‐ andtrans‐vicinal spin‐spin coupling constants of substituted cyclic 5‐membered compounds is discussed. The temperature dependence oftrans‐vicinal coupling constants is shown to be essentially stronger than that ofcis‐vicinal coupling constants if the energies of the conformers corresponding to potential energy curve minima are different. The temperature dependence of 33 vicinal spin‐spin coupling constants has been studied for di‐ and trisubstituted thiophanes with a known configuration of substituents. Experimentally determined changes oftrans‐vicinal coupling constants with temperature are markedly larger than those forcis‐vicinal coupling constants, whose values, in most cases, are practically temperature independent. Differences in the temperature dependence ofcisandtrans‐vicinal spin‐spin coupling constants can be applied for the determination of the configuration of substituents in sat

ISSN:0030-4921    

DOI:10.1002/mrc.1270060209

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY

摘要:

AbstractChemical shifts are reported for the acetyl protons in a series ofpara‐substituted acetophenones in a number of solvents, and substituent effects evaluated statistically by means of the Swain‐Lupton multiple correlation analysis. A basic set of substituents was built up by careful choice of substituted derivatives, and it was shown that this facilitated the possibility of valid comparisons of substituent effects between differing systems. Strong emphasis was placed on the idea of individuality of substituents and solve

ISSN:0030-4921    

DOI:10.1002/mrc.1270060210

出版商:John Wiley&Sons Limited    

年代:1974

数据来源: WILEY