bluuebunny/crossref_metadata_2025_split huggingface dataset:
Conformations of highly hindered aryl ethers: XXIII–PMR evidence for preferred conformations and intramolecular π complex formation in nitrophenyl naphthyl ethers
Authors: Lehmann F. Pedro A. 
Published: May 2005

AbstractThe PMR spectrum of 2‐bromo‐4,6‐dinitrophenyl 2′‐naphthyl ether (1) is consistent with the preferential adoption of a twist conformation (1a) in which the 6‐nitro group and the 1′‐hydrogen are located endo to the ether link. This preference is explained by the formation of an intramolecular π complex between the 6‐nitro group and the C1′C2′ bond, which is stronger than that formed with the C2′C3′ bond, in accord with their bond orders. This study adduces further evidence in favor of: (a) the adoption of twist conformations by these and related ethers, (b) the importance of intramolecular π complex formation as a conformational influence, (c) the formation of complexes in such cases is with specific portions of, and not the complete, π cloud and (d) indicates that similar effects may be discerned in analogous ethers related to the thyroid hormones.
Kernresonanzspektroskopische Untersuchungen an Pentafluorphenylsubstituierten Silanen: II–Fernkopplungen und Through Space Effekte
Authors: Hägele Gerhard , Weidenbruch Manfred 
Published: May 2005

AbstractLongrange‐Kopplungen des Typs 5J(FH) und 6J(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)n bzw. ([AX]2M)n mit interanularen Kopplungen der ortho‐Fluor‐atome benachbarter Ringe zurückgeführt.
Zur NMR–Spektroskopie der meso‐ und racem‐Formen einiger Verbindungen mit zwei gleichwertigen asymmetrischen Kohlenstoffatomen in einer offenen Kette
Authors: Larsson Erik 
Published: May 2005

AbstractDie chemischen Verschiebungen der CH‐ und (OCH3)‐Protonen der folgenden in meso‐ und racem‐Formen vorkommenden Verbindungen wurden in verschiedenen Lösungsmitteln bestimmt: in (CD3)2CO; (RCHCO2H)2 (R = Cl, Br, C6H5S, CH3COS), (C6H5CHCO2H)2S und (C6H5CHCO2H)2S2; in (CD3)2CO, CDCl3, CCl4, C6D6, CS2; (RCHCO2CH3)2 (R = Cl, Br, C6H5, C6H5S, CH3COS), (C6H5CHCO2CH3)2S und (C6H5CHCO2CH3)2S2. Es wurde gezeigt, dass die chemische Verschiebung eines Protons in der meso‐Form derjenigen in der racem‐Form sein kann und dass die Differenzen zwischen ihnen nicht zu einer relativen Konfigurationsbestimmung verwendet werden können. Der Unterschied in den NMR‐Spektren einer meso‐ und einer racem‐Form ist in den meisten Fällen hinreichend gross, um eine Bestimmung der beiden Formen in einem Gemisch derselben zu ermöglichen.
Résonance Magnétique Nucléaire en phase nématique. Exploration de la barrière d'empêchement à la libre rotation pour le fluorure d'acroyle et l'acroléine
Authors: Courtieu J. , Gounelle Y. , Gonord P. , Kan S. K. 
Published: May 2005

AbstractLes spectres RMN de l'acroléine et du fluorure d'acroyle (CH2CHCOX avec XH et F) orientés dans une phase nématique ont été interprétés et des informations sur l'équilibre conformationnel s‐cis ⇄ s‐trans ont été obtenues. La barrière s'opposant à la libre rotation du groupement COX a été étudiée à l'aide de différentes hypothèses. Un bon accord a été obtenu entre les spectres expérimentaux et les spectres calculés en utilisant une fonction potentiel V(ϕ) = ΣnVn(1 – cos nϕ)/2, avec V1 = −200 cal mol−1, V2 = 1500 cal mol−1 et V3 = 400 cal mol−1 pour le composé fluoré; et V1 = 1200 cal mol−1, V2 = 3000 cal mol−1 et V3 = 2000 cal mol−1 pour l'acroléine; ce dernier composé existe presque exclusivement sous la forme s‐trans.
Etude conformationnelle de la dimethyl‐3,4 cyclopentanone trans: II—Spectres de RMN
Authors: Sablayrolles Claire , Granger Robert , Girard Jean‐Pierre , Bodot Hubert , Aycard Jean‐Pierre , Bardet Lucette 
Published: May 2005

AbstractLes spectres RMN de la diméthyl‐3,4 cyclopentanone trans et de la diméthyl‐3,4 tétradeutério 2,2,5,5 cyclopentanone‐trans ont été analysés. Les constantes de couplage, déterminées pour le composé deutérié, sont en faveur d'une conformation diéquatoriale des groupements méthyle.
Internal rotation around the isopropyl‐nitrogen bond and stable conformations of S‐methyl‐N,N‐di‐isopropyldithiocarbamate, dichlorotin(IV) bis(N,N‐di‐isopropyldithiocarbamate) and related compounds
Authors: Tanaka Toshio , Watanabe Noriyoshi 
Published: May 2005

AbstractTemperature dependent proton magnetic resonance spectra of dichloro‐ and dimethyltin(IV) bis(N,N‐di‐isopropyl‐dithiocarbamate) (1 and 2, respectively), dimethylchlorotin(IV) N,N‐di‐isopropyldithiocarbamate (3), dimethyltin(IV) bis(N‐isopropyldithiocarbamate) (4), S‐methyl‐N,N‐di‐isopropyldithiocarbamate (5) and S‐methyl‐N‐isopropyldithiocarbamate (6) were measured in halogenated hydrocarbons or CS2. The internal rotation around the isopropyl–nitrogen bond of 1, 2, 3 and 5 is restricted below −30°C, and that of 4 and 6 below −70°C; 1, 2 and 3 exist as only one conformer in dichloromethane, while 5 exists as two rotational isomers with respect to the isopropyl–nitrogen bond with a mole ratio of about 2·7:1·0 in CS2 below −30°C. At this temperature, 6 exists as two stereoisomers in CS2 with a mole ratio of about 1·2:1·0, although there is no stereoisomer in 4. From these results, possible conformations of the compounds at low temperature are proposed and the assignments of each proton signal are described.
Sur le calcul a priori des déplacements chimiques de 1H et de 19F
Authors: Stahl‐Larivière H. 
Published: May 2005

AbstractNous proposons une nouvelle méthode de calcul du déplacement chimique de 1H et de 19F dans les molécules organiques saturées. Les résultats obtenus montrent que celui‐ci est le bilan de plusieurs contributions et permettent une évaluation de celles‐ci: une contribution diamagnétique d(—ϵ) proportionnelle à la charge nette ϵ de l'environnement électronique du noyau étudié et des contributions paramagnétiques pX de chacun des substituants géminés, constantes pour chaque substituant X lorsqu'on passe d'une molécule à une autre. Pour les deux noyaux, les valeurs de d utilisées sont déduites des calculs théoriques de l'écran dans l'atome libre. Cette méthode, qui n'utilise qu'un nombre très restreint de paramètres déduits de l'expérience nous a permis de retrouver les déplacements chimiques expérimentaux avec un écart moyen, pour 1H de ± 0,32 ppm, pour 19F de ± 11 ppm. Elle a donc l'interêt de fournir une relation quantitative simple entre déplacement chimique et structure permettant de dégager des indications précises sur l'origine des contributions des environnements voisins.
Long range carbon–proton coupling constants in pyridine
Authors: Miyajima Goh , Takahashi Kensuke , Sugiyama Hiroshi 
Published: May 2005

AbstractCarbon‐13 NMR spectra of pyridine have been observed by using the slow scan technique in the absorption mode. The long range coupling constants between carbon‐13 and protons have been obtained and assigned by the isotope substitution method.
Analyse isotopique de mélanges d'éthanols deutériés C2H5‐nDnOH
Authors: Bengsch E. , Corval M. , Martin G. L. 
Published: May 2005

AbstractOn décrit l'analyse isotopique qualitative et quantitative de mélanges d'isomères nucléaires de l'éthanol C2H5‐nDnOH, obtenus par diverses réactions de réduction et dans lesquels une des variétés domine nettement. Après détermination par spectrométrie de masse du pourcentage des variétés isotopiques de même deutériation globale, celles‐ci sont identifiées par RMN protonique et deutonique en combinant les schémas spectraux de tous les isomères qui peuvent être envisagés jusqu'à concordance avec les spectres expérimentaux; on tient compte de l'effet isotopique sur δ. Les variétés isotopiques présentes sont ensuite dosées avec une précision variable par intégration de raies caractéristiques. On compare également pour chaque mélange les intensités globales des signaux méthyliques et méthyléniques en résonance du proton et du deuton. Pour les signaux méthyléniques, élargis par relaxation quadrupolaire du deuton, on fait apparaître les structures fines en augmentant la température de l'échantillon.
Proton spin coupling constants in cycloalkenes
Authors: Solkan V. N. , Sergeyev N. M. 
Published: May 2005

AbstractThe proton‐proton coupling constants in cyclopentadiene, cyclohexadiene, cycloheptatriene, cyclooctatetraene, cyclopentene and cyclohexene have been calculated using the finite perturbation INDO method. The carbon geometry was taken from the corresponding electron diffraction studies. The theory gives satisfactory agreement with experiment. In terms of the many factor structural model, distance and angle distortions have been studied in ethylene, cis‐1,3‐butadiene and cis‐2‐butene. It has been established that these distortions produce noticeable changes only for those protons whose co‐ordinates are changed. The coupling constants across three, four and five bonds are discussed separately in connection with the structural factors and the σ–π contribution. Finally, variations in the proton co‐ordinates in cyclopentadiene are used to optimize the proton couplings.
Stereochemical studies: XVII—the proton coupling constants and conformational equilibria of trans‐1,2‐disubstituted cyclohexenes
Authors: Viktorova N. M. , Knyazev S. P. , Zefirov N. S. , Gavrilov Yu. D. , Nikolaev G. M. , Bystrov V. F. 
Published: May 2005

AbstractThe vicinal 3Jaa and 3Jee spin‐spin coupling constants of a number of deuterated trans‐1,2‐disubstituted cyclohexenes and the ΔH and ΔS values of the conformational equilibria of these compounds have been determined by computer optimisation of the 3J(HH) = f(T) function. Compounds with —CF3 and CCl3 substituents were shown to have an enhanced proportion of the diaxial conformer.
Etude par RMN à haut champ des monofluoroanilines
Authors: Forchioni A. , Chachaty C. 
Published: May 2005

AbstractL'analyse des spectres RMN à 250 MHz des monofluoroanilines complexées par du Pr(FOD)3 a permis de déterminer avec précision les constantes de couplages J(HH) et J(FH) de ces composés. La validité des attributions a été contrôlée en reconstituant les spectres par calcul électronique.
Etudes RMN en série hétérocyclique—XIII:Spectres des azoles dans l'acide sulfurique
Authors: Elguero José , Fruchier Alain , del Carmen Pardo Maria 
Published: May 2005

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 par les azotes.
Conformational analysis of 7,7‐dichloro‐2,5‐dioxabicyclo[4.1.0] heptane by NMR
Authors: Schauble J. Herman , Lazear Nelson R. 
Published: May 2005

AbstractThe 1H NMR spectra of 7,7‐dichloro‐2,5‐dioxabicyclo‐[4.1.0]heptane (1) were analyzed through the application of programs NMRIT and NMREN2.See Ref. 1.
The half‐chair conformation of 1 was obtained from the vicinal coupling constants by the Buys R method.See Ref. 2.
Etude par RMN du proton de la complexation du triéthylaluminium par l'éther diéthylique
Authors: Marchal J. P. , Canet D. , Bonnet P. , Barriol J. 
Published: May 2005

AbstractLa complexation entre le triéthylaluminium et l'éther diéthylique a été étudiée par résonance magnétique du proton. On a pu observer des signaux distincts pour le triéthylaluminium libre et le triéthylaluminium lié. Une stoechiométrie 1:1 est démontrée grâce aux rapports des aires de ces signaux. A plus haute concentration d'éther, des mesures de déplacements chimiques prouvent qu'il n'apparaît pas d'autres complexes.
NMR study of the acetylation of 2,3‐diphenylbenzofuran
Authors: Barboiu V. , Wexler H. , Arventiev B. 
Published: May 2005

AbstractThe positions of acetyl groups introduced by Friedel‐Crafts reactions into 2,3‐diphenylbenzofuran and its derivatives monomethylated in the 5,6 and 7 positions and dimethylated in the 5,6 positions were determined by means of single and double resonance NMR spectra. It was found that the first acetyl group occupies position 6 for all 6‐unmethylated compounds and position 5 for 6‐methylated compounds. The next two acetyl groups enter the para positions (4′ and 4″) of the phenyl groups with the same probability. When positions 5 and 6 are methylated the acetyl group enters positions 7,4′ and 4″ which are found to be of almost equal reactivity. The NMR parameters of compounds studied are listed.
Rotational isomerism: XVII—solvent effects on the NMR spectra and rotamer energies of some tetrahaloethanes
Authors: Abraham R. J. , Cooper M. A. , Siverns T. M. , Swinton P. F. , Weder H. G. , Cavalli L. 
Published: May 2005

AbstractThe NMR spectra of 1,1‐dichloro‐2,2‐difluoroethane (1), 1,1‐dibromo‐2,2‐difluoroethane (2), meso and dl 1,2‐dichloro‐1,2‐difluoroethane (3) and 1,1,2,2‐tetrachloroethane (4) have been analysed in a number of solvents. The 19F spectrum of 3 in L‐bornyl acetate at 56·4 and 94·1 MHz allows an unambiguous identification of the meso and dl isomers. The spectra of the d and l isomers consist of two AA′XX′ spectra with a small chemical shift difference between the d and l forms, whilst that of the meso form is an apparent AA′XX′ spectrum at 56·4 MHz but an ABXX′ spectrum at 94·1 MHz, the 19F nuclei in this isomer being anisochronous in this solvent. The observed solvent and temperature dependence of the couplings of 1, 2, meso 3 and 4 when combined with the calculated solvation energies, allow the determination of the rotamer energies and couplings in these molecules. The rotamer energy differences (Eg – Et) in the liquid and vapour states are 0·6 and −0·2 kcal/mol (1); 0·4 and −0·5 kcal/mol (2); 0·9 and 0·2 kcal/mol meso (3) and −0·1 and −0·8 kcal/mol (4). The 3J(HH), 3J(HF) and 3J(FF) couplings for the distinct rotamers are considered together with those of similarly constituted molecules. The general agreement demonstrates that the solvation theory may be applied to multisubstituted ethanes without any basic modifications. The trans oriented HH couplings show a linear substituent electronegativity dependence, which differs appreciably from that obtained for disubstituted ethanes, however. The gauche couplings show the influence of dihedral angle variations as well as substituent electronegativity. The rotamer 3J(FF) couplings in meso 3 are −38·2 Hz (Jt) and −17·4 Hz (Jg).
Carbon‐13 magnetic resonance study of spiro compounds
Authors: Zimmermann D. , Ottinger R. , Reisse J. , Christol H. , Brugidou J. 
Published: May 2005

AbstractA large series of cyclohexane and cyclopentane spiro compounds has been studied by carbon‐13 NMR. Increments have been derived in terms of α, β, γ spiro substituent effects, one ring being considered as the substituent of the other. As usual α and β effects are paramagnetic and γ effects are diamagnetic. They are compared with the corresponding effects associated with the introduction of a gem dimethyl group into a cyclohexane or cyclopentane ring. The size of the two rings involved in the spirane structure has a marked influence especially on the chemical shift of the spirane carbon atom. Comparison between monospiro and dispiro derivatives gives information about the so‐called 1,5 or δ effect which is paramagnetic. From an analytical point of view, carbon‐13 NMR appears to be a powerful method of detecting the spirane structure, apparently including the relative size of the rings.
1H NMR study of cyclo‐L‐Thr‐L‐Thr and cyclo‐L‐Thr‐L‐His conformations
Authors: Ptak Marius , Heitz Annie 
Published: May 2005

AbstractCyclodipeptides containing L‐Thr and L‐His residues have been studied by 1H NMR in D2O and DMSO‐d6. In the neutral form in D2O as in DMSO‐d6, the folded form of the L‐His residue is not unique. The diketopiperazine ring seems to be not strictly planar.
Boron–carbon coupling constants: II—the tetraphenylborate anion
Authors: Odom Jerome D. , Hall Laurence W. , Ellis Paul D. 
Published: May 2005

AbstractBoron‐carbon coupling constants were obtained from the 13C FT‐NMR, 1H noise decoupled spectra of sodium tetraphenylboron and tetra‐n‐butylammonium tetraphenylboron. The appearance of the spectra, as well as values obtained for J(BC), are discussed and contrasted with previously published data.
Chemical shift reagents in the study of polycyclic alcohols IX—1H NMR spectra of myrtenol and some other primary alcohols
Authors: Paasivirta Jaakko , Häkli Harri , Widen Karl‐Gustav 
Published: May 2005

AbstractStructure proof of (—)‐myrtenol, 3‐cyclopentenyl‐1‐methanol and 5‐norbornene‐2‐endo‐methanol has been obtained from their proton magnetic resonance spectra in carbon tetrachloride containing different added amounts of tris(dipivaloylmethanato)europium. For each alcohol, a 1:1 complex structure with Eu(dpm)3 could be computed, in which the calculated pseudocontact shift effects on all skeleton protons of the ring system were consistent with the observed shift effect values. A considerable contact contribution of opposite sign to that of the pseudocontact part of the effect could be estimated for the methylene protons of the CH2OH group.
Quantitative 13C NMR analysis of mixtures of 2,4‐di‐isocyanatotoluene and 2,6‐di‐isocyanatotoluene
Authors: O'Neill I. K. , Pringuer M. A. 
Published: May 2005

AbstractSome isomeric mixtures, such as the toluene di‐iso‐cyanates, may be quantitatively analysed by measurement of peak heights of a 13C FT‐NMR spectrum without the use of gated decoupling or the addition of paramagnetics.
1H NMR spectra and electronic structure of 3‐arylmethyl‐idenephthalide and 3‐arylthiomethylidenephthalide derivatives
Authors: Vida M. , Kellö V. , Liptaj T. , Perjéssy A. , Hrnčiar P. , Lácová M. 
Published: May 2005

AbstractThe 1H NMR spectra of trans‐3‐phenylmethylidenephthalide and trans‐3‐phenylthiomethylidenephthalide derivatives were investigated. After applying a correction for the anisotropy of substituents and/or for changes of ring current in the substituted aromatic ring, linear correlations were obtained between the chemical shifts of protons of the substituted phenyl group and the methine group and s̀ constants of substituents. The influence of the bridge heteroatom on the transfer of electronic effects of substituents through the molecules under study is discussed.
Konformationsanalyse von 1,4:3,6‐bis(Thioanhydro)‐D‐idit Derivaten
Authors: Sohár P. , Kuszmann J. 
Published: May 2005

AbstractDie dominierende Konformation einiger 1,4:3,6‐bis(Thioanhydro)‐D‐idit Derivate (1a bis 1c) wurde durch 1H NMR Untersuchungen bestimmt. Weiterhin konnte auch die Konfiguration und Konformation des durch Oxydation aus 2,5‐Di‐O‐acetyl‐1,4:3,6‐bis(thioanhydro)‐D‐idit (1b) hergestellten symmetrischen (3) und asymmetrischen (4) Disulfoxyds, sowohl die des Disulfons (5) aufgeklärt werden.
Etude RMN de β‐hydroxy‐phosphonates‐esters. Détermination du signe du couplage stéréospécifique 4J(PCCOH) dans le diastéréoisomère RS,RS
Authors: Bottin‐Strzalko T. , Pouet M. J. , Simonnin M. P. 
Published: May 2005

AbstractDes expériences d'INDOR effectuées sur le β‐hydroxyphosphonate ester RS,RS en solution dans le (CD3)2CO ou (CD3)2SO montrent que le couplage 4J(PCCOH) est positif. La valeur plus élevée de ce couplage dans (CD3)2SO que dans (CD3)2CO indique qu'une géométrie en W rend le couplage plus positif.
Dual standard addition for quantitative NMR analysis
Authors: Cockerill A. F. , Harden R. C. , Davies G. L. O. , Rackham D. M. 
Published: May 2005

AbstractA technique is described for quantitative NMR measurement which involves the use of a pair of internal standards. This procedure overcomes several of the problems encountered with only one standard material. A computer programme is described for statistical treatment of the results.
Conformation et spectrométrie de R.M.N.: II
Authors: Wylde Renée , Saeluzika Justin 
Published: May 2005

AbstractLes quatre tétradeutério‐1,1,4,4 diméthylamino‐3 décalols‐2 trans ont été synthétisés. L'examen des spectres de RMN de ces composés permet de confirmer la conformation ‘chaise aplatie’ de l'isomère cis à groupement diméthylamino axial et hydroxyle équatorial, tandis que les autres d'ammonium quaternaires on note également une déformation dans le cas du composé diaxial, cette déformation est accentuée dans l'iodure d'ammonium quaternaire cis N(CH3)3a OHe, conduisant à la conformation ‘chaise croisée’.
Effects of some phosphorus substituents on the carbon‐13 chemical shifts of alkyl chains
Authors: Quin Louis D. , Gordon Michael D. , Lee Shin Ok 
Published: May 2005

AbstractThe carbon‐13 NMR spectra of 16 aliphatic phosphorus compounds with ‐PCl2, ‐P(OCH3)2, ‐P(CH3)2 or ‐PS(CH3)2 groups were determined and interpreted on the basis of the usual α, β‐deshielding and γ‐shielding effects. The α‐effects of all the groups were quite large (15 to 30 ppm), though the β‐effects were small (0 to 3 ppm). The γ‐effects were also small (0·2 to 1·6 ppm), but of significance in suggesting reduced steric compression relative to that found for methyl and most of the common organic functional groups. This may be attributed to the greater length of the CP bond. The phosphorus‐31 NMR spectra of these compounds also show the existence of interaction with γ‐carbons by exhibiting small additive upfield shifts.
Nuclear magnetic resonance studies of internal rotation. V—Rotational barriers of acetylenic amides
Authors: Spassov S. L. , Dimitrov V. S. , Agova M. , Kantschovska‐Dimicoli I. , Todorova‐Momcheva R. 
Published: May 2005

AbstractThe rotational barriers about the CN bond of the N,N‐dimethylamides of propiolic, methylpropiolic and phenylpropiolic acids have been determined by the iterative total line shape nuclear magnetic resonance method.
Effects of methyl substituents on the proton chemical shifts in the NMR spectra of the twenty methyl and ethyl substituted hydrazines. Electronegativity values for hydrazyl groups
Authors: Condon F. E. 
Published: May 2005

AbstractThe CH proton NMR spectra of the twenty conceivable methyl and ethyl substituted hydrazines are presented and analyzed with respect to effects on chemical shifts of the CH protons caused by replacement of hydrogen by methyl and ethyl groups on the CNNC chain. Thirteen different methyl substituent effects and six different ethyl substituent effects are identified and evaluated. Most of the effects are shielding and in accordance with an electron‐releasing inductive effect of alkyl groups. A deshielding effect (the ‘CC bond effect’) is observed when a methyl group replaces the hydrogen on the carbon bearing the hydrogen in focus and primary hydrogen on the carbon bearing the hydrogen in focus and primary hydrogens become secondary, as observed in other systems. On the basis of their effects on the chemical shifts of methyl protons in CH3X, eighteen different hydrazyl groups (× = NR1NR2R3) fall into three classes: I (R1 = H; R2, R3 = H or alkyl); II (R1 = alkyl; R2 and/or R3 = H); III (R1, R2 and R3 = alkyl), with slightly different electronegativities: 2·94, 2·83 and 2·74, respectively.
13C nuclear magnetic resonance spectra of arylthallium(III) bis(trifluoroacetates)
Authors: Ernst Ludger 
Published: May 2005

Abstract13C chemical shifts and 13C205Tl spin–spin coupling constants are reported for phenylthallium(III) bis(trifluoroacetate) and some of its mono‐ and dimethyl derivatives. The signs of nJ(13C, 205Tl) relative to n+1J(1H, 205Tl) are determined by offresonance decoupling of protons.
The temperature dependence of the 13C nuclear magnetic resonance spectra of porphyrins
Authors: Lincoln David N. , Wray Victor 
Published: May 2005

AbstractThe high temperature 13C NMR spectra of the methyl esters of deuteroporphyrin‐IX and protoporphyrin‐IX, and octaethylporphyrin show sharp discrete signals for the inner macrocycle carbon resonances. The temperature dependence of these shifts is discussed.