15N NMR spectra, tautomerism and diastereomerism of 4,5-dihydro-1H-1,2,3-triazoles

2001 ◽  
pp. 126-134 ◽  
Keyword(s):  
Nmr Spectra ◽  
15N Nmr

1H, 13C and 15N NMR Spectra of Coupling Products of Benzenediazonium Salts with Aliphatic Nitro Compounds and Study of Their E/Z Isomerism

1996 ◽  
Vol 61 (4) ◽  
pp. 589-596 ◽  
Author(s):  
Antonín Lyčka
Keyword(s):  
Dimethyl Sulfoxide ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Nitro Compounds ◽  
Coupling Constants ◽  
15N Nmr ◽  
Geometrical Isomers ◽  
Sodium Salts ◽  
Aliphatic Nitro Compounds ◽  
Tautomeric Forms

The 1H, 13C and 15N NMR spectra have been measured of coupling products of benzenediazonium salts with nitromethane, nitroethane, 1-nitropropane, 2-nitroethanol and of their sodium salts, and the chemical shifts have been unambiguously assigned. The coupling products have been found to exist only in their hydrazone tautomeric forms. Stereospecific behaviour of the coupling constants 2J(15N,1H) and 2J(15N,13C) in the 15N isotopomers and NOESY have been used to differentiate between the E and Z geometrical isomers. The above-mentioned compounds exist as Z isomers in deuteriochloroform and predominantly (>95%) as E isomers in dimethyl sulfoxide, while the sodium salts are present only as E isomers in dimethyl sulfoxide.

15N NMR spectra of some ionic liquids based on 1,3-disubstituted imidazolium cations

2006 ◽  
Vol 44 (5) ◽  
pp. 521-523 ◽  
Author(s):  
Antonín Lyčka ◽  
Roman Doleček ◽  
Petr Šimûnek ◽  
Vladimír Macháček
Keyword(s):  
Ionic Liquids ◽  
Nmr Spectra ◽  
15N Nmr ◽  
Imidazolium Cations

Proton coupling networks from extended DEPT GL spectral editing of 13C and 15N NMR spectra

1985 ◽  
Vol 63 (3) ◽  
pp. 601-604 ◽  
Author(s):  
Hans J Jakobsen ◽  
Ulla B Sørensen ◽  
Henrik Bildsøe ◽  
Ole W Sørensen
Keyword(s):  
Nmr Spectra ◽  
15N Nmr ◽  
Spectral Editing ◽  
Proton Coupling

scholarly journals 15N NMR Spectra of Cobalt(III) Complexes Containing15NO2−

1985 ◽  
Vol 58 (11) ◽  
pp. 3407-3408 ◽  
Author(s):  
Yoshio Odaka ◽  
Akira Yamasaki ◽  
Masatoshi Watabe
Keyword(s):  
Nmr Spectra ◽  
15N Nmr

15N NMR Spectra of Pyrazine, Methylpyrazines and TheirN-Oxides

1996 ◽  
Vol 34 (7) ◽  
pp. 567-570 ◽  
Author(s):  
Chiseko Sakuma ◽  
Mikiko Maeda ◽  
Katsumi Tabei ◽  
Akihiro Ohta ◽  
Ablikim Kerim ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
15N Nmr

Anwendung der 15N-NMR-Spektroskopie zur Charakterisierung reaktiver, koordinativ ungesättigter Zinn-, Bleiund Phosphor-Stickstoff-Verbindungen / Application of 15N-NMR Spectroscopy to the Characterization of Reactive, Coordinatively Unsaturated Tin-, Lead- and Phosphorus-Nitrogen Compounds

1987 ◽  
Vol 42 (12) ◽  
pp. 1515-1519 ◽  
Author(s):  
Carin Stader ◽  
Bernd Wrackmeyer
Keyword(s):  
Nmr Spectra ◽  
Pulse Sequence ◽  
Coupling Constants ◽  
Spin Coupling ◽  
15N Nmr ◽  
Nmr Data ◽  
15N Nmr Spectroscopy ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

AbstractThe basic INEPT pulse sequence proved most useful for recording 15N NMR spectra at natural abundance of bis(amino)stannvlenes (1). -plumbylenes (2) and of imino-amino-λ2-phosphanes (3), where the nitrogen atoms carry bulky substituents like Me3Si-, t-Bu-, 2.4.4-trimethyl-2- pentyl-groups (t-Oct-groups) or are part of the 2.2.6.6-tetramethylpiperidinyl group. The sensitiv­ity of this technique is proved by the observation of 117/119Sn or 207Pb satellites owing to spin-spin coupling constants 1J(117/119Sn15N) and 1J(117/119Pb15N), respectively. NMR data of bis[bis(trimethylsilyl)methyl]tin (4) are reported in order to corroborate the arguments for the interpretation of the δ(15N) and 1J(119Sn15N) data. The 15N NMR data of the λ2-phosphanes (3) indicate a bonding situation similar to that in triazenes.

1H, 13C, and 15N NMR Spectra of Ni(II) Complexes of Schiff Bases of (S)-2-(N-Benzylprolyl)aminobenzophenone and α-Monosubstituted Glycine and Determination of Configuration of the Complexes by 2D NOESY Spectra

1995 ◽  
Vol 60 (6) ◽  
pp. 990-998 ◽  
Author(s):  
Josef Jirman ◽  
Alexander Popkov
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Absolute Configuration ◽  
Nmr Spectra ◽  
Phenyl Group ◽  
15N Nmr ◽  
Dimethylamino Group ◽  
2D Noesy ◽  
Noesy Spectra

1H, 13C, and 15N NMR spectra have been measured of substituted Ni(II) complexes of Schiff bases of (S)-2-(N-benzylprolyl)aminobenzophenone and glycine. The absolute configuration at C19 of the substituted glycine can be determined from 2D NOESY spectra using the NOESY interactions with the proton of the second chiral centre of the complex. It is possible to determine the rate of rotation of phenyl group of benzophenone unless its rotation is prevented by requatorialr orientation of dimethylamino group as it is the case with the Ni(II) complex of Schiff base of (S)-2-(N-benzylprolyl)aminobenzophenone and (S)-α-dimethylaminoglycine.

15N NMR spectra of carbolines

1993 ◽  
Vol 31 (7) ◽  
pp. 694-695 ◽  
Author(s):  
J. Hodge Markgraf ◽  
David P. Richardson ◽  
Robert C. Livingston
Keyword(s):  
Nmr Spectra ◽  
15N Nmr
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