Search results for "Sigma bond"

showing 2 items of 2 documents

Synthesis, electrochemistry, and spectroelectrochemistry of (P)Ge(Fc)2 and (P)Ge(C6H5)(Fc): first example of metal-carbon-.sigma.-bonded porphyrins w…

1988

Inorganic ChemistryMetalChemistryvisual_artInorganic chemistryvisual_art.visual_art_mediumchemistry.chemical_elementPhysical and Theoretical ChemistrySigma bondCyclic voltammetryElectrochemistryCarbonInorganic Chemistry
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1H, 13C and 15N NMR study of 2-alkylnitrosoamino-4-nitropyridines and N-oxides: An example on restricted inversion of sp3 nitrogen

2007

Abstract The 1 H, 13 C and 15 N NMR chemical shifts of seven 2-alkylnitrosoamino-4-nitropyridines and seven 2-alkylnitrosoamino-4-nitropyridine N -oxides have been assigned. The GIAO/DFT 13 C chemical shifts of energetically optimized structures have been calculated. The results were compared to the chemical shifts of previously studied 2-alkylamino and 2-alkylnitramino derivatives of 4-nitropyridine and 4-nitropyridine N -oxide. In sterically crowded ortho -substituted congener (2-ethylnitrosoamino-3-methyl-4-nitropyridine N -oxide) restricted inversion of pyramidal amino nitrogen forms a chiral center in the molecule and makes the geminal protons of N–CH 2 -moiety diastereotopic. In 5- an…

Steric effectsChemistryStereochemistryChemical shiftOrganic ChemistryCarbon-13 NMRAnalytical ChemistryInorganic ChemistryCrystallographyProton NMRMoietyMoleculeSigma bondConformational isomerismSpectroscopyJournal of Molecular Structure
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