scholarly journals Exocyclic Enamines of Pyrrolo[1,2-a]quinoxalines Generated by 1,3-dipolar Cycloaddition Reactions of Benzimidazolium Ylides to Activated Alkynes

2001 ◽  
Vol 71 (3) ◽  
pp. 197-209 ◽  
Author(s):  
Alina Nicolescu ◽  
Emilian Georgescu ◽  
Florea Dumitrascu ◽  
Florentina Georgescu ◽  
Florina Teodorescu ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Dipolar Cycloaddition ◽  
Cycloaddition Reactions ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Mild Conditions ◽  
Quinoxaline Derivatives ◽  
Multinuclear Nmr Spectroscopy ◽  
Activated Alkynes

The reactions of N-acetonylbenzimidazolium chlorides with various activated alkynes, in the presence of bases, led under mild conditions to a mixture of pyrrolo[1,2-a]benzimidazoles (3), 4-methylene-pyrrolo[1,2-a]quinoxaline derivatives (4) and pyrrolo[1,2-a]quinoxalin-4-one derivatives (5). The exocyclic enamine derivatives 4 have been fully characterized by multinuclear NMR spectroscopy and X-ray crystallography. A mechanism rationalizing the formation of the enamine derivatives is proposed.

Synthesis of Rh(iii) thiophosphinito pincer hydrido complexes by base-free C–H bond activation at room temperature

2018 ◽  
Vol 54 (49) ◽  
pp. 6292-6295 ◽  
Author(s):  
G. Vlahopoulou ◽  
S. Möller ◽  
J. Haak ◽  
P. Hasche ◽  
H.-J. Drexler ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Room Temperature ◽  
Bond Activation ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Mild Conditions ◽  
Multinuclear Nmr Spectroscopy ◽  
Additional Base

Rhodium(iii) thiophosphinito pincer hydrido complexes were synthesised by C–H activation under exceptionally mild conditions at room temperature without additional base or irradiation and fully characterised by multinuclear NMR spectroscopy and X-ray crystallography.

Anionic indabenzene: synthesis and characterization

2017 ◽  
Vol 53 (99) ◽  
pp. 13260-13263 ◽  
Author(s):  
Taichi Nakamura ◽  
Katsunori Suzuki ◽  
Makoto Yamashita
Keyword(s):  
Nmr Spectroscopy ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Multinuclear Nmr Spectroscopy

An anionic indabenzene was synthesized via the transmetallation of an aluminacyclohexadiene with bulky silyl substituents, and fully characterized using multinuclear NMR spectroscopy and X-ray crystallography.

Consecutive N2 loss from a uranium diphosphazide complex

2020 ◽  
Vol 49 (3) ◽  
pp. 578-582 ◽  
Author(s):  
Tara K. K. Dickie ◽  
Connor S. MacNeil ◽  
Paul G. Hayes
Keyword(s):  
Nmr Spectroscopy ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Multinuclear Nmr Spectroscopy ◽  
Uranium Species

A uranium(iv) complex supported by an unusual diphosphazide ligand was prepared. Controlled, consecutive N2 loss was observed, affording well-defined uranium species that were characterized by multinuclear NMR spectroscopy and X-ray crystallography.

Pentafluorophenyl and phenyl substituted azidoborates

2002 ◽  
Vol 80 (11) ◽  
pp. 1444-1450 ◽  
Author(s):  
Wolfgang Fraenk ◽  
Thomas M Klapötke ◽  
Burkhard Krumm ◽  
Heinrich Nöth ◽  
Max Suter ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Single Crystal ◽  
Boron Atom ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Multinuclear Nmr Spectroscopy

The azidoborates [(C6F5)4–nB(N3)n]– (n = 1–3) (1–3) were synthesized by reacting the corresponding borane with [R]N3 (R = Me4N, Ph4P). To study the influence of the electron withdrawing C6F5-substituent on the boron atom, [Me4N][(C6H5)3BN3] (4) was also prepared. All compounds were fully characterized by IR, Raman, and multinuclear NMR spectroscopy in addition to characterization by single crystal diffraction analyses.Key words: azidoborate, pentafluorophenyl, multinuclear NMR spectroscopy, X-ray crystallography.

Solid-State Structure and Tautomerism of 2-Aminotroponimines Studied by X-ray Crystallography and Multinuclear NMR Spectroscopy

2004 ◽  
Vol 2004 (21) ◽  
pp. 4452-4466 ◽  
Author(s):  
Rosa M. Claramunt ◽  
Dionisia Sanz ◽  
Marta Pérez-Torralba ◽  
Elena Pinilla ◽  
M. Rosario Torres ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
State Structure ◽  
Solid State Structure ◽  
X Ray ◽  
Multinuclear Nmr ◽  
X Ray Crystallography ◽  
Multinuclear Nmr Spectroscopy
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