Neue 1-Aza-2 λ5, 4 λ5-diphosphirine (2 λ5, 4 λ5-Diphosphapyridine) / New 1 -Aza-2λ5, 4λ5-diphosphirines (2λ5, 4λ5-Diphosphapyridines)

1991 ◽  
Vol 46 (6) ◽  
pp. 762-766 ◽  
Author(s):  
Ekkehard Fluck ◽  
Manfred Spahn ◽  
Gernot Heckmann
Keyword(s):  
Physical Properties ◽  
Long Range ◽  
Mass Spectra ◽  
Coupling Constants

6-(Furan-2-yl)-2,4-tetrakis(dimethylamino)-1-aza-2λ5, 4λ5-diphosphirine (2) and 6-(N-pyrrolidinyl)-2,4-tetrakis(dimethylamino)-1-aza-2λ5, 45-diphosphirine (3) were prepared by reacting 1,1,3,3-tetrakis(dimethylamino)-1 λ5,3 λ5-diphosphete with 2-cyanofuran, and N-cyanopyrrolidine, respectively. 2 and 3 are characterized by their physical properties, NMR, IR, and mass spectra. In 2 two 6J(PH) long range coupling constants could be identified.

A novel synthesis of 2,4,6-trithiaheptane and its conversion into 2,6-bis(methylthio)thiane. Spectral properties of some thiaalkanes

1981 ◽  
Vol 59 (2) ◽  
pp. 326-332 ◽  
Author(s):  
J. Stuart Grossert ◽  
Donald L. Hooper ◽  
William M. Neaves
Keyword(s):  
Long Range ◽  
Spectral Properties ◽  
Mass Spectra ◽  
Fragmentation Pathway ◽  
Coupling Constants ◽  
Spectral Studies ◽  
Proton Coupling ◽  
Novel Synthesis ◽  
C Nmr

2,4,6-Trithiaheptane (1a) has been prepared by lithium tetrahydridoaluminate reduction of the methiodide of 1,3,5-trithiane (2). Treatment of 1a with strong bases permitted formation of 3-alkylated derivatives (3) which could in turn be converted into diastereomeric mixtures of 3,5-dialkyl derivatives (4). A two-step alkylation of 1a with 1-bromo-3-chloropropane led to the formation of 2,6-bis(methylthio)thiane (5). Proton and 13C nmr spectral studies on these compounds, including the measurement of long-range carbon–proton coupling constants, are described; their mass spectra showed elimination of methanethiol as a characteristic major fragmentation pathway.

How to measure long-range proton-carbon coupling constants from 1 H-selective HSQMBC experiments

2019 ◽  
Vol 58 (5) ◽  
pp. 363-375 ◽  
Author(s):  
Josep Saurí ◽  
Pau Nolis ◽  
Teodor Parella
Keyword(s):  
Long Range ◽  
Coupling Constants

Measurement of long-range heteronuclear coupling constants

1989 ◽  
Vol 85 (1) ◽  
pp. 111-131 ◽  
Author(s):  
Jeremy J Titman ◽  
David Neuhaus ◽  
James Keeler
Keyword(s):  
Long Range ◽  
Coupling Constants ◽  
Heteronuclear Coupling

scholarly journals Signs of proton–proton and proton–fluorine spin–spin coupling constants in 2-fluoro-3-methylpyridine. Sigma and pi contributions to coupling in a nitrogen heterocycle

1969 ◽  
Vol 47 (9) ◽  
pp. 1507-1514 ◽  
Author(s):  
T. Schaefer ◽  
S. S. Danyluk ◽  
C. L. Bell
Keyword(s):  
Nitrogen Atom ◽  
Long Range ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Nitrogen Heterocycle ◽  
Triple Resonance ◽  
Triple Resonance Experiments ◽  
Proton Proton ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

The signs of all proton–proton and proton–fluorine spin–spin coupling constants in 2-fluoro-3-methylpyridine have been determined by double and triple resonance experiments. The signs of the longrange coupling constants, JH,CH3 and JF,CH3 are the same as in fluorotoluene derivatives. Their magnitudes are consistent with the assumption that the nitrogen atom primarily polarizes the σ bonds in the molecule, leaving the π contribution to the long-range coupling relatively unaffected.

Long-range couplings in the N.M.R. spectra of isoquinolines

1971 ◽  
Vol 24 (11) ◽  
pp. 2311 ◽  
Author(s):  
F Balkau ◽  
ML Heffernan
Keyword(s):  
Long Range ◽  
Chemical Shifts ◽  
Coupling Constants

The N.M.R. spectra of several isoquinolines have been recorded and analysed. Extensive spin-decoupling allowed the magnitudes and relative signs of the long- range coupling constants to be determined, and these are presented. Several unusual features of the chemical shifts and coupling constants are noted.

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