bluuebunny/crossref_metadata_2025_split huggingface dataset:
Conformational study of somatostatin analogues in methanol at low temperature
Authors: Verheyden Patricia M. F. , Coy David H. , Van Binst Georges 
Published: May 2005

AbstractThe conformations of three somatostatin analogues were compared in methanol at 193 K. A biologically active cyclic analogue, DC13‐116 (D‐Nal5‐Cys6‐Tyr7‐D‐Trp8‐Lys9‐Val10‐Cys11‐Thr12‐NH2), and two linear analogues, one biologically active, DC25‐24 (D‐Phes5‐Cpa6‐Tyr7‐D‐Trp8‐Lys 9‐Val10‐Phe11‐Thr12‐NH2), and one with poor biological activity, DC23‐89 (D‐Phe5‐Ala6‐Phe7‐D‐Trp8‐Lys9‐Thr10‐Ala11‐Thr12‐NH2), were compared. The predominant conformation of the linear active analogue is shown to be the same as that of the active cyclic analogue; they both adopt a β11 turn/β‐sheet structure. The linear analogue with low activity has a similar conformation, which, however, is less stable.
Structural changes in the complexation of benzo‐crown ethers—NOESY and variable‐temperature 13C NMR study
Authors: Mariappan S. V. Santhana , Gomathi L. , Subramanian S. 
Published: May 2005

AbstractThe structural changes during the complexation of benzo‐crown ethers with Cs+, K+ and Na+ were studied by NOESY and variable‐temperature 13C NMR spectroscopy. It was found that, on complexation, the distance between the CH‐α and 1‐CH2 is reduced in dibenzo‐24‐crown‐8 (DB24C8), dibenzo‐18‐crown‐6 and benzo‐15‐crown‐5. Two mechanisms have been proposed for the distance reduction, the fluttering motion of the benzo group and the elongation of the crown moiety. However, it is concluded that both of these mechanisms seem to play a role in the distance reduction. In the complexed state of DB24C8 with Cs+, Cs+ is predicted to be slightly above the plane of the crown oxygens with respect to DB24C8.
Determination of Z and E configurations in trifluoromethylated vinyl compounds: 3J(CF) coupling constants as a criterion for configurational assignments
Authors: Bégué Jean‐Pierre , Bonnet‐Delpon Danièle , Mesureur Dany , Ourévitch Michèle 
Published: May 2005

AbstractNOE and T1 proton measurements were carried out in order to determine unambiguously the Z and E configurations of some CF3‐trisubstituted vinylic compounds (HCRCR′CF3). The β‐ethylenic carbon in olefins, enol ethers and enamines is always more strongly coupled to CF3 in the cis compound (CF3 and the vinylic proton cis to each other): |3J(CF)|cis > |3J(CF)|trans. This observation, in addition to the already known higher shielding of 19F NMR signal in the cis isomer, allows the safe assignments of Z and E isomers even when only one is obtained, regardless of the nature of R and R′.
Synthesis and steric structure of alicycle‐fused 1,3‐thiazine‐β‐lactams
Authors: Sohár Pál , Szabó János , Simon Lajos , Talpas Gizella S. , Szücs Erzsébet , Bernáth Gábor 
Published: May 2005

Abstract2 + 2‐Cycloaddition reactions of cis‐ and trans‐cyclopenta‐, ‐cyclohexa‐ and ‐cyclohepta‐ and trans‐cycloocta [e]‐2‐phenyl‐4H‐1,3‐thiazines gave new types of hydrated tricyclic 1,3‐thiazino‐β‐lactam derivatives having the 2‐phenyl substituent and H‐9 in cis positions. The configurations and conformations of the new compounds were determined by 1H and 13C NMR spectroscopy, including double resonance, DNOE and 2D HSC measurements.
1H NMR spectra of a series of disperse azo dyes
Authors: Fedorov L. A. , Savarino P. , Dostovalova V. I. , Viscardi G. , Carpignano R. , Barni E. 
Published: May 2005

AbstractThe 1H NMR spectra of a series of disperse monoazo dyes in solution are reported and analysed in terms of electronic effects of the substituents, rotational isomerism and hydrogen bonding.
Carbon‐13 NMR signals of some substituted indanones, tetralones and benzo‐α‐pyrones, β‐substituted β‐phenylpropionic acids and related compounds
Authors: Patra Amarendra , Misra Swapan K. 
Published: May 2005

Abstract13C spectral assignments for 3‐methyl‐1‐indanone, 3‐ethyl‐1‐indanone, 3‐n‐propyl‐1‐indanone, 3‐phenyl‐1‐indanone, 3‐phenyl‐1‐tetralone, 3‐ and/or 4‐substituted benzo‐α‐pyrones and dihydrobenzo‐α‐pyrones, together with those for 3‐phenylbutyric acid, 3‐phenylvaleric acid, 3‐phenylcaproic acid, 3,3‐diphenylpropanoic acid, 3,4‐diphenylbutyric acid, their 2‐carboxy derivatives and the ethyl esters of the 2‐carbethoxy derivatives are reported.
1H and 13C NMR studies on the conformation of E,Z‐diastereomers of N‐desmethyl‐N,O‐diacetyl‐α‐metazocine (sp2‐hybridized nitrogen derivatives of a benzomorphan narcotic analgesic)
Authors: Glaser Robert , Bernstein Michael A. , Balan Ayala 
Published: May 2005

AbstractThe 1H (300 MHz) and 13C (75.5 MHz) NMR spectra (CDCl3) of N‐desmethyl‐N,O‐diacetyl‐α‐metazocine showed two (E,Z)‐amide diastereomers (ratio ≈︁ 1 : 2, respectively). All four vicinal proton‐proton coupling constants in each NCH2CH2C moiety were readily measured owing to effective chemical shift dispersion caused by the acetamido function. All vicinal coupling constants were also measured in the E. COSY 2D NMR spectrum. Comparison of the vicinal coupling constants involving sp2‐N piperidine ring protons in the (E,Z)‐amides and the corresponding values involving sp3‐N piperidine ring protons in morphine free base and hydrochloride N‐methyl diastereomers shows them to be similar. The R‐factor method was used to estimate a 54(1)° value for the NCH2CH2C dihedral angle in the sp2‐N piperidine ring for both solution‐state E,Z‐diasteromers. The corresponding dihedral angle within the sp3‐N piperidine ring in solid‐state (±)‐6‐desmethyl‐8‐deoxy‐α‐metazocine · HCl was found to be 53.8° by x‐ray crystallography. Both sp2 and sp3 N‐hybridrization seem to afford basically the same slightly flattened chair‐type conformations for the piperidine‐ring.
Conformational studies of caprylolactam
Authors: Borgen Gerd 
Published: May 2005

AbstractThe equilibrium mixture of the cis and trans isomers of caprylolactam (1‐azacyclononan‐2‐one), was studied by 1H and 13C NMR spectroscopy at various temperatures. The exchange between corresponding carbons in the two isomers in solution was studied by 2D NOE. Assignments were made for all 13C lines of the cis and trans isomers in CDCl3, CD3OD and C5D5N by 2D NMR. The conformations and conformational processes were studied by low‐temperature NMR. The trans isomer was shown to exist in at least two different conformations in solution. In addition to the high barrier interconversion between the cis and trans isomers, two different conformational processes were found for the trans isomer in the temperature range −140 to +60°C and one for the cis isomer. The conformational processes in solution are identified as (1) geminal 1H exchange in the cis and the trans isomers: for the cis isomer with a coalescence temperature of ca. −70°C a free energy of activation of 40 kJ mol−1 and for the trans isomer with a coalescence temperature of ca. +40°C a free energy of activation of 61 kJ mol−1; and (2) a low‐temperature process interconverting two trans conformations with a coalescence temperature of ca. −120°C and a free energy of activation of 29 kJ mol−1, observed in both the 1H and the 13C spectra.
Carbon‐13 NMR relaxation studies of some dicyclohexyl compounds at high pressure
Authors: Gillies Duncan G. , Matthews Stephen J. , Sutcliffe Leslie H. 
Published: May 2005

AbstractFour dicyclohexyl compounds were investigated, one of which is a traction fluid and the remainder have related structures in which the cyclohexyl rings are separated by two or three carbon atoms. Carbon‐13 spin‐lattice relaxation times have been measured at 25.16 MHz at pressures up to 200 MPa over the temperature range 280‐329 K. High‐pressure relaxation data have been successfully interpreted in terms of the ‘model‐free’ approximation. A pressure‐dependent rotational coupling parameter, κ, was evaluated from a modified Stokes‐Einstein‐Debye relationship using experimentally determined pressure‐dependent rotational correlation times. The smallest value of κ was found to be associated with the most rigid and least‐extended molecule, showing that molecular shape has a significant effect on the rotational‐translational coupling. The values obtained for the activation volumes derived from methyl group data suggest that barriers to internal motion are governed by intramolecular effects. It has been demonstrated that high‐pressure 13C relaxation measurements can provide a powerful means of studying the relationship between molecular rigidity and the macroscopic behaviour of functional fluids.
1H and 13C NMR study of 1‐substituted isatins and their corresponding 3‐(dicyanomethylidene)indol‐2‐ones
Authors: Morales‐Ríos Martha S. , Joseph‐Nathan Pedro 
Published: May 2005

AbstractThe assignments of the 1H and 13C NMR signals of 1‐substituted isatins and their corresponding 3‐(dicyanomethylidene)indol‐2‐ones were derived by analysis of the 13C1H spin coupling patterns and by inspection of the two‐dimensional C, H shift correlation spectra. Erroneous literature assignments have been corrected. A significant difference between the 5Δ‐deuterium isotope effects on the 13C chemical shifts of the CN groups cis and trans to the heterocyclic amide fragment (D)HNCO was observed in partially deuteriated 3‐(dicyanomethylidene)indol‐2‐one. This geometric dependence was used to assign the two CN groups that are otherwise difficult to assign.
Assignment of the 1H and 13C NMR spectra of the quinolizidine alkaloid anagyrine and determination of its conformation
Authors: Rycroft David S. , Robins David J. , Sadler Ian H. 
Published: May 2005

AbstractThe 1H NMR spectrum of the quinolizidine alkaloid ( − )‐ anagyrine has been studied at 200 and 600 MHz. A full assignment of the 1H signals has been achieved by application of a variety of NMR techniques, including homo‐nuclear spin decoupling, NOE difference, 2D δH/δH COSY and direct δc/δH correlation (including HMQC) experiments. The 13C NMR spectrum has also been assigned, and differences from the current literature assignments are reported. The conformation of ( − )‐anagyrine has been elucidated by consideration of the proton‐proton spin‐spin coupling constants and NOEs. The configuration of the lone pair of the tertiary amine nitrogen is β, ring B has an envelope conformation and rings C and D have chair conformations with cis‐decalin type of ring fusion between them.
Assignment of the 1H, 13C and 15N resonances in cyclodextrin nitrates by 2D NMR and the determination of the regioselectivity of the hydroxylamine‐induced denitration reactions
Authors: Bulusu S. , Axenrod T. , Liang B. , He Y. , Yuan L. 
Published: May 2005

AbstractHexakis(2,3,6‐tri‐O‐nitro)‐α‐cyclodextrin and heptakis(2,3,6‐tri‐O‐nitro)‐β‐cyclodextrin were prepared and the complete assignment of the 1H, 13C and 15N resonance signals in each case was achieved using homonuclear shift correlation experiments, one‐bond 13C1H and three‐bond 15NOC1H heteronuclear shift correlation measurements. The denitration of these cyclodextrin nitrates by hydroxylamine in pyridine was investigated to study its selectivity in preparing partially nitrated derivatives of these cyclodextrins. The sites of denitration were determined in each case using 13C and 15N NMR and the products were completely characterized. The results indicate that denitration of these cyclodextrin nitrates is a highly regiospecific reaction occurring at the 2‐position only and giving rise to hexakis(3,6‐di‐O‐nitro)‐α‐cyclodextrin and heptakis(3,6‐di‐O‐nitro)‐β‐cyclodextrin, respectively.
One‐ and two‐dimensional multinuclear magnetic resonance study of azaphospholes; sign determination of J(15N, 1H), J(31P, 1H), J(31P, 13C), J(31P, 15N); Application of hahn‐echo extended pulse sequences
Authors: Wrackmeyer Bernd , Kupče ĒRiks , Schmidpeter Alfred 
Published: May 2005

AbstractVarious 1,2,3‐ and 1,3,4‐diazaphospholes (1 to 4), a 1,2,3,4‐triazaphosphole (5) and two 1,2,3‐diazaphospholium chlorides (6, 7) have been studied by 13C, 15N and 31P NMR spectroscopy. The absolute signs [based on 1J(13C, 1H) > 0] of numerous coupling constants [e.g., 1J(31P, 13C) < 0, 1J(31P, 15N) > 0] have been determined by combining information from one‐dimensional selective 1H{31P}, 13C{31P} and two‐dimensional (2D) 13C/1H, 15N/1H and 31P/1H heteronuclear shift correlations. Hahn‐echo extended (HEED) pulse sequences have been applied to one‐ and two‐dimensional 31P NMR measurements. In 1D 31P NMR spectra, 1J(31P, 15N) coupling constants can be conveniently determined. The corresponding HEED 2D 31P/1H experiments yield, in addition, the long range nJ(15N1H) (n = 2,3) coupling constants (and their relative signs). Furthermore, isotope shifts, 1Δ15/14N, on 31P resonances were measured. The low frequency shifts (−0.072 to −0.114 ppm) observed here for two‐coordinate phosphorus compounds 1 to 7 are much larger than those previously reported for P(V)‐ and three‐coordinate P(III) compounds.
Solution phase 1H and 13C‐NMR studies of some 1,4,8,11,15,18,22,25‐octa‐alkylphthalocyanines
Authors: Cook Michael J. , Cracknell Steven J. , Moore Geoffrey R. , Osborne Michael J. , Williamson David J. 
Published: May 2005

AbstractSolution state 1H NMR and 13C NMR spectral data are reported for 1,4,8,11,15,18,22,25‐octahexylphthalocyanine, its zinc metallated analogue, and 1,4,8,11,15,18,22,25‐octanonylphthalocyanine. Full 1H and 13C NMR signal assignments for these compounds have been made using one and two dimensional techniques supported by T1 measurements. 13C NMR spectra of the two metal‐free derivatives show only three signals in the aromatic region at 100 MHz but the expected four resonances at 22.5 MHz. The apparent absence of one of these at 100 MHz is ascribed to a fast exchange process, originating from NH ⃛N⇌N ⃛HN tautomerism.
Complete assignment of the 1H and 13C NMR spectra of norbornene derivatives
Authors: Fisher Julie , Gradwell Michael J. 
Published: May 2005

AbstractThe complete assignment of the 1H and 13C spectra of 2‐exo‐ and 2‐endo‐nor‐bornenemethanol is presented. Resonance assignment was achieved using 1H–1H double resonance, COSY and 1H/13C correlation spectra. Computer simulations of the H‐2 (exo or endo) proton decoupled spectrum for both isomers enabled scalar couplings to be determined.
1H NMR study of casein phosphopeptide (1–25): Assignment and conformation
Authors: Tsuda Sakae , Niki Ryoya , Kuwata Tamotsu , Tanaka Isao , Hikichi Kunio 
Published: May 2005

AbstractThe solution conformation of β‐casein phosphopeptide (CPP) was studied by 1H NMR spectroscopy. As a prerequisite to the conformational analysis the spectral assignment was carried out for CPP in the Ca2+‐free and ‐bound states by the use of two‐dimensional NMR spectroscopy. The assigned resonances were used for (1) pH‐titration experiments, (2) elucidation of the temperature dependence of the amide resonance and (3) a nuclear Overhauser enhancement (NOE) experiment. Although the β‐turn conformation is predicted for the sequence – Val8–Pro9–Gly10–Glu11–of CPP, the present NMR results do not provide favourable evidence for its formation.
NMR evidence for an NH+ …OC intramolecular hydrogen bond in 2‐alkyl‐3‐morpholinopropiophenones—structure of a new elevated high density lipoprotein agent in solution
Authors: Cotelle Nicole , Cotelle Philippe 
Published: May 2005

Abstract7‐[2‐(4‐morpholinomethyl)butanoyl]‐4‐methyl‐2H‐1, 4‐benzoxazin‐3 (4H)‐one hydrochloride (2a) (a new elevated high density lipoproteins agent) and related compounds have been studied by NMR spectroscopy. Compound 2a exhibits an intramolecular hydrogen bond between the NH+ and CO bonds in solvents with low nucleophilicity. These results are confirmed by IR spectroscopy in solution.
Proton‐coupled carbon‐13 NMR spectra of butadienes
Authors: Harris Robin K. , Ng Soon , Connelly Alan 
Published: May 2005

AbstractProton‐coupled 13C NMR spectra were obtained for three methyl‐substituted butadienes, namely 2‐methylbuta‐1,3‐diene, trans‐2‐methylpenta‐1,3‐diene and 2,4‐dimethylpenta‐1,3‐diene. The second‐order spectra were analysed by computer, using some new 1H NMR data, and the resulting chemical shifts and coupling constants are reported. The parameters are related to conjugation (and, in turn, to conformation) of the compounds, and to the influence of σ and π pathways for coupling.
Magnitudes and relative signs of J(119Sn, 13C) and J(119Sn,H) coupling constants in some organotin(IV) compounds using 2D NMR methods
Authors: Lyčka Antonín , Jirman Josef , Holeček Jaroslav 
Published: May 2005

AbstractTwo‐dimensional H,C‐COSY spectra of some tetra‐, penta‐ and hexa‐coordinated organotin(IV) compounds were measured. The relative signs of nJ(119Sn,13C) and (n+1 J(119Sn,1H) coupling constants were determined after analysis of the orientation of the appropriate 119/117Sn satellites in the H,C–COSY spectra. The relative signs in BunSn and BznSn (n = 2 or 3) derivatives are opposite, whereas in Ph3Sn derivatives these signs are the same for carbon atoms in the ortho and meta positions and opposite for carbon atoms in the para positions. The same sign was found for 2J(119Sn,13C‐2) vs. 2J(119SnC1H2) in tribenzyltin(IV) chloride from the COLOC spectrum.
Multinuclear MR studies of Platinum(II) nitroimidazole complexes: 15N‐labelling and reactions with nucleotides
Authors: Macdonald Fiona M. , Sadler Peter J. 
Published: May 2005

AbstractPlatinum nitroimidazole complexes are potentially useful for sensitizing tumour cells towards radiation damage. We have studied reactions of cis‐[Pt(II)(MNZ)2Cl2], where MNZ is 1‐(2′‐hydroxyethyl)‐2‐methyl‐5‐nitroimidazole (metronidazole), with guanosine monophosphate (5′‐GMP) and the oligonucleotides GpC, GpG and d(GpCpGpC) using 1H NMR spectroscopy. The complex [Pt(MNZ)2(5′‐GMP)2]Cl2 · 7H2O was isolated and characterized. Novel syntheses of cis‐ and trans‐[Pt(15N‐DMZ)2Cl2], where DMZ is 1,2‐dimethyl‐5‐nitroimidazole (dimetridazole), and NMR spectra of 15N‐enriched intermediates in the ligand synthesis, and of these complexes are discussed. Reactions of the enriched cis complex with 5′‐GMP were investigated by NMR spectroscopy.
Multinuclear high‐resolution solid‐state magnetic resonance studies of some platinum(II) complexes with phosphorus‐containing ligands
Authors: Harris Robin K. , McNaught Ian J. , Reams Patrick , Packer Kenneth J. 
Published: May 2005

AbstractCross‐polarization, magic‐angle spinning NMR experiments have been carried out for nine square‐planar platinum(II) complexes, each with two substituted phosphine ligands. 13C and 13P (and, in some cases, 195Pt) nuclei were observed. The results reveal crystallographic non‐equivalence which, in one instance, is confirmed by subsequent X‐ray studies. Chemical shifts and coupling constants—(Pt,P), (Pt,C), (P,C) and, for one compound, (Sn,P)—are reported and discussed. Shielding tensor data are also presented.
Solution structure of [(triphos*)RhH2(AuPPh3)3][PF6]2 deduced by one‐ and two‐dimensional 1H{31P} and 1H{103Rh} double‐resonance techniques
Authors: Imhof Daniel , Rüegger Heinz , Venanzi Luigi M. , Ward Thomas R. 
Published: May 2005

AbstractThe application of 1H{31P} and 1H{103Rh} double‐resonance techniques for the elucidation of the solution structure of the metalla‐tetrahedrane clusters of the [(triphos*)RhH2(AuPPh3)3][PF6]2 type, with the chiral tripodal phosphine triphos* [RRR/SSS‐ or RRS/SSR‐1,1,1,‐tris(methylphenylphosphinomethyl)ethane] is described. Variable‐temperature studies revealed three types of dynamic processes, i.e. rapid rotation of the trigold moiety (AuPPh3)3, mutual exchange of the diastereotopic hydrides and slow rotation of the RRS/SSR‐triphos* unit in one diastereomer.
Comparison of solid‐state and solution structures of (R3P)2CdX2, (Et3P)2Cd2X4 and (Bu3P)3Cd2X4 complexes
Authors: Kessler Janet M. , Reeder Jonathan H. , Vac Rahel , Yeung Constance , Nelson John H. , Frye James S. , Alcock Nathaniel W. 
Published: May 2005

AbstractThe cadmíum (II) phosphine complexes (Et3P)2Cd2X4, (R3P)2CdX2 [R3P = Ph3,P, Bu3P, Et3P, 1‐phenyldibenzophosphole (DBP), and 1‐phenyl‐3,4,‐dimethylphosphole (DMPP)] and (Bu3P)3Cd2X4 (X = Cl, Br, I) have been prepared and their solution and solid state structures determined by a combination of elemental analyses, conductance, infrared and NMR spectroscopy. The structures of (Ph3P)2CdI2 (1) and (DBP)2CdI2 (2) have been determined from three‐dimensional X‐ray data collected by counter methods. Compound 1 crystallized in space group P21,/a with a = 18.312 (9), b = 10.285 (5), c = 19.311 (9) Å, β = 115.53 (4)° and Z = 4. Compound 2 crystallized in space group P21,/n with a = 12.698 (3), b = 15.302 (4), c = 17.477 (4) Å, β = 96.66 (2)° and Z = 4. The structures were refined by least‐squares methods with RF = 0.041 and 0.048 for 4157 and 3393 unique reflections with I/σ(I) ⩾ 2.0 for 1 and 2, respectively. Both molecules deviate from ideal C2v symmetry and have very slightly different Cd‐I (1; 2.724 (2), 2.731 (2); 2; 2.718 (1), 2.721 (1) Å) and Cd‐P (1, 2.631 (2), 2.653 (2); 2; 2.616 (3), 2.603 (3) Å) bond distances. The Cd‐P bond distance differences are sufficient to give rise to a second order ABX CP/MAS 31P{1H} NMR spectrum for 1 but for 2 the phosphorus nuclei of the two DBP ligands are chemical shift equivalent. The CP/MAS 113Cd{1H} NMR spectra of both compounds 1 and 2 show apparent first order triplets. The (Bu3P)3Cd2X4 complexes are shown by variable temperature 31P{1H} NMR and conductance measurements to exist in solution as equilibrium mixtures of (Bu3P)2Cd2X4 and (Bu3P)2CdX2. CP/MAS 31P{1H} and 113Cd{1H} NMR spectra suggest that these compounds exist as doubly halide bridged (R3P)2Cd(μ‐X)2CdX2(R3P) species containing four‐ and five‐coordinate cadmium in the solid state. Equilibrium and activation thermodynamics for the ligand exchange processes of representative complexes have been determined from variable temperature 31P{1H} NMR spectra in CDCl3/CH2Cl2 (1:1) solutions.
Interactions and 2D NOESY. Pd(II) and Pt(II) cylometallation chemistry
Authors: Pregosin Paul S. , Wombacher Franz 
Published: May 2005

AbstractPhase sensitive,1H 2D NOESY measurements have been made on a variety ofN,N′‐dimethylbenzylamine cyclopalladated complexes with coordinated ligands having pendant CH moieties. For 8‐methylquinoline and benzo [h] quinoline it can be shown that the quinoline‐methyl and benzoquinoline CH‐10 moieties, respectively, reside in a pseudo fifth coordination position above the square planar complex. This information arises primarily from NOEs from one NCH3and H3′, the protonorthoto the PdC bond. Similar NOESY studies have also been carried out for (i) a cyclopalladated aliphatic analog based on Pd(NO3(L){N(CH3)2CH2C (CH3)(OCH3)CH2} and (ii) a cyclopalladated phosphite (C∩oP), of the form Pd(NO3)(L){P(OEt)2OC6H4}. New platinum complexes of the typetrans‐[PtCl2L (tertiary phosphine or tertiary arsine)] are presented, and the spin–spin coupling constants from the pendant CH of L to the195Pt are discussed. Several of these complexes can exist in two geometric forms, i.e., for the phosphite complexes: Ptransto N, Ctransto O as against Ptransto O, Ctransto N. A distinction between these isomers is made using the same1H NOESY spectra that provide information concerned with the pendant CH functions.
13C NMR study of N‐acyl‐ and N‐sulphonyl‐isatins and their ring‐opened derivatives
Authors: Angell E. Charles , Black David St C. , Kumar Naresh 
Published: May 2005

AbstractThe complete assignments of the 13C NMR resonances of 1‐acetyl‐, 1‐benzoyl‐, 1‐benzenesulphonyl‐, 1‐methanesulphonyl‐ and 1‐(2‐nitrobenzenesulphonyl)‐isatins and their ring‐opened glyoxylic derivatives are reported. The 13C assignments of acylisatins were derived from isatin as a model, while assignments of glyoxylic derivatives were made by complete assignment of compound 8b together with its use as a model.
1H and 13C two‐dimensional NMR study of magainin 1
Authors: Yu Chin , Yang Ta‐Horng 
Published: May 2005

AbstractThe 1H and 13C NMR spectra of magainin 1, a sterilizing agent of the skin, were studied using two‐dimensional techniques. All the 1H and 13C NMR resonances were unambiguously determined from a combination of 2D homo‐ and heteronuclear NMR spectroscopy.