Wiley
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Modelling of the alkyl environment effects on the 13C chemical shiftAbstract Using a topological parameter, λR , to characterize the effects of a variable mono or polyalkyl environment, R , on widely varied types of 13 C sites gives rise to a homogeneous description of their chemical shifts over the entire range of δ13 C variation (220 ppm/TMS). Th... ...
Wiley - Tập 14 Số 4 - Trang 264-271 - 1980
Héterocycles contenant du phosphore—XVII: Etude par Résonance Magnétique Nucléaire et analyse conformationnelle de quelques oxazaphosphorinanes‐1,3,2Abstract Le spectre de RMP de quelques nouveaux oxazaphosphorinanes‐1,3,2 est analysé. Dans un cas, après élimination du couplage entre les protons et le phosphore, on a affaire à un système ABKLXY particulier dans lequel certaines constantes de couplage entre protons vicinaux sont nulles. Le système ABKLXY où J AK = ...
Wiley - Tập 5 Số 9 - Trang 407-412 - 1973
Analysis of the 13C NMR spectra of mono‐ and dimethoxy‐β‐methyl‐β‐nitrostyrenes: Spectral assignments and conformational effectsAbstract The 13 C NMR spectra of β‐methyl‐β‐nitrostyrene and its nine mono‐ and dimethoxy‐derivatives have been determined. Chemical shift data are presented and analysed in a self‐consistent manner which allows most of the signals to be unambiguously assigned. Trends in the data can be interpreted in terms of the conformational properties of the...
Wiley - Tập 16 Số 1 - Trang 47-51 - 1981
1H and 13C NMR study of 8‐hydroxyquinoline and some of its 5‐substituted analoguesAbstract 1 H and 13 C NMR spectra of 8‐hydroxyquinoline (oxine) and its 5‐Me, 5‐F, 5‐Cl, 5‐Br and 5‐NO2 derivatives have been studied in DMSO‐d 6 solution. The 1 H and 13 C chemical shifts and proton–proton, proton–fluor...
Wiley - Tập 15 Số 3 - Trang 280-284 - 1981
The 1H, 13C and 31P NMR spectra of EZ pairs of some phosphorus substituted alkenesAbstract The olefins Ph2 P(X)CHCHR [X=lone pair, O, S, Ch3 I ; RCh3 , ph, P(X)ph2 ] have been prepared and their 1 H, 13 C and 31 P NMR spectra measured. trans 3...
Wiley - Tập 15 Số 1 - Trang 37-42 - 1981
13C NMR spectra of 8‐aryl‐8‐azabicyclo[3.2.1]oct‐3‐en‐2‐ones and related compoundsAbstract Carbon‐13 NMR spectra of various 8‐aryl‐8‐azabicyclo[3.2.1]oct‐3‐en‐2‐ones and other related compounds, including tropinone, were determined, and the predominant conformation at the bridgehead nitrogen was established. The full assignment of resonances from proton decoupled and coupled spectra was based on the analysis of the splitting pattern and character... ...
Wiley - Tập 12 Số 6 - Trang 357-361 - 1979
Conformational analysis of the tropane analogue of pethidine and related compounds by 1H NMR spectroscopyAbstract The preferred solute conformation of ethyl 3α‐phenyltropane‐3β‐carboxylate hydrochloride, the tropane analogue of pethidine, is shown to be a piperidine chair with an axial 3‐phenyl substituent by analysis of its 1 H NMR characteristics and spectral comparisons with model compounds. Conformational studies of synthetic intermediates are a... ...
Wiley - Tập 6 Số 8 - Trang 441-444 - 1974
Détermination des Axes Propres et des Valeurs Principales du Tenseur ḡ dans deux Radicaux Libres Nitroxydes par Étude de MonocristauxAbstract La structure de la phase basse température du radical nitroxyde tétraméthyl‐2,2,6,6 pipéridine oxyle‐1 (Tanane) a été déterminée. Ce radical libre est isomorphe du tétraméthyl‐2,2,6,6 pipéridinol‐4 oxyle‐1 (Tanol). Une étude en résonance paramagnétique électronique de monocristaux a permis de déterminer les valeurs principales et l'orientation des axes prop... ...
Wiley - Tập 5 Số 1 - Trang 47-52 - 1973
Synthesis, 1H NMR spectral properties and conformational preferences of some open‐chain and cyclic aromatic sulphides containing pyridine or 1,3,4‐thiadiazole unitsAbstract The conformational preferences in solution of eight new open‐chain and cyclic aromatic sulphides containing pyridine or 1,3,4‐thiadiazole units have been investigated, parallel to those of some structurally related phenyl sulphides, by means of 1 H NMR spectroscopy. The results obtained have shown that replacement of phenyl by the pyridy... ...
Wiley - Tập 16 Số 1 - Trang 1-6 - 1981
Automatic assignment of 13C NMR spectra based on the chemical shift/charge density relationshipAbstract An approach for the automatic assignment of 13 C spectra, based on the chemical shift/charge density relationship, is suggested. All permutations of spectral signals are computer‐generated, and for every permutation a least squares adjustment is carried out. The permutation presenting the highest correlation coefficient, or the lowest Ha... ...
Wiley - Tập 16 Số 4 - Trang 296-303 - 1981
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