Journal ArticleDOI
Kernresonanzspektroskopische Untersuchungen an Borverbindungen, VII. 11B- und 14N- Kernresonanzstudien an tetrakoordinierten Bor-Stickstoff-Verbindungen
Heinrich Nöth,Bernd Wrackmeyer +1 more
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TLDR
In this paper, nuclear magnetic resonance studies on tetracoordinated boron nitrogen compounds are reported and discussed, showing that there is a nearly linear relationship for δ14N or δ11B of R3B adducts (RH, CH3, C2H5) of aliphatic amines and δ13C of alkanes isoelectronic and isosteric with them.Abstract:
Die chemischen Verschiebungen δ11B und δ14N einer grosen Zahl von tetrakoordinierten Bor-Stickstoff-Verbindungen werden mitgeteilt und diskutiert. Es besteht eine nahezu lineare Korrelation zwischen den δ14N- bzw. δ11B-Werten der R3B-Addukte (RH, CH3) aliphatischer Amine und den δ13C-Daten der mit diesen Addukten isoelektronischen und isosteren Alkanen. Auserdem geben die δ14N- und δ11B-Daten von R3B-Addukten (RH, CH3, C2H5) mit N-Heteroaromaten (Azinen, Azolen) Auskunft uber ihre Stabilitat und Struktur.
Nuclear Magnetic Resonance Studies on Boron Compounds, VII. 11B and 14N N.M.R. Studies on Tetracoordinated Boron Nitrogen Compounds
11B and 14N chemical shifts for many tetracoordinated boron nitrogen compounds are reported and discussed. There is a nearly linear relationship for δ14N or δ11B of R3B adducts (RH, CH3) of aliphatic amines and δ13C of alkanes isoelectronic and isosteric with these adducts. Furthermore, δ14N and δ11B data of R3B adducts (RH, CH3, C2H5) of N-heteroaromatic systems (azines, azoles) give information related to their stability and structure.read more
Citations
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Journal ArticleDOI
The tetrahedral character of the boron atom newly defined—a useful tool to evaluate the N→B bond
TL;DR: The tetrahedral character at the boron atom in borsin complexes with a coordinative N→B bond has been evaluated on the basis of 144 solid state and gas phase molecular structures in order to obtain additional information on the van der Waals versus covalent relationship of the Borsin-nitrogen bond as discussed by the authors.
Journal ArticleDOI
Recent developments in the chemistry of amine- and phosphine-boranes
Book ChapterDOI
Nuclear Magnetic Resonance Spectroscopy of Boron Compounds Containing Two-, Three- and Four-Coordinate Boron
TL;DR: In this paper, the influence of boron chemistry on various areas of research in inorganic, organic, and theoretical chemistry is well documented, and many models currently employed to describe chemical bonding in general can be traced to attempts to understand bonding in boranes.
Journal ArticleDOI
Lewis Acid Acceleration of C–N Bond-Forming Reductive Elimination from Heteroarylpalladium Complexes and Catalytic Amidation of Heteroaryl Bromides
Qilong Shen,John F. Hartwig +1 more
TL;DR: The binding of Lewis acids to the pyridyl nitrogen led to an acceleration of the amidation of unactivated heteroaryl bromides catalyzed by palladium complexes of Xantphos, which translated to catalytic C−N bond-forming coupling processes.
References
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Nitrogen NMR Spectroscopy
M. Witanowski,L. Stefaniak +1 more
TL;DR: The NMR spectra of nitrogen nuclei may provide an important contribution to the development of the general theory of chemical shifts, by allowing a rigorous check of current theories as discussed by the authors.
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Interpretation of the proton and nitrogen chemical shifts of pyridine and pyridinium cation
V. M. S. Gil,J. N. Murrell +1 more
Journal ArticleDOI
„Aktivierung” N-haltiger Heterocyclen durch Silylierung†
TL;DR: In this paper, the Reaktionsfahigkeit der Si-N-Bindung haben wir verschiedene N-haltige Heterocyclen durch Umsatz mit Hexamethyldisilazan (1), Triathylaminosilan (2) oder Trimethylchlorsilan (3) in die N-Trialkylsilyl-Derivate ubergefuhrt.
Journal ArticleDOI
Nitrogen-14 nuclear magnetic resonance of azoles and their benzo-derivatives
TL;DR: In this paper, the average excitation energy approximation of the theory of chemical shifts is found to be reliable for the 14 N shifts of pyrrole-type nitrogen atoms in azole ring systems, even if the effect of polarisation in the σ-bonds is ignored.