Iminophosphorane-substituted proton sponges. Part 4. Comparison of X-ray molecular structures with solution properties (pKa,1H and13C NMR spectroscopy)

1993 ◽  
pp. 709-713 ◽  
Author(s):  
José Laynez ◽  
Margarita Menéndez ◽  
José Luis Saiz Velasco ◽  
Antonio L. Llamas-Saiz ◽  
Concepción Foces-Foces ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Molecular Structures ◽  
Solution Properties ◽  
1H And13c Nmr ◽  
X Ray ◽  
1H And13c Nmr Spectroscopy ◽  
Proton Sponges

Equilibrium,1H and13C NMR Spectroscopy, and X-ray Diffraction Studies on the Complexes Bi(DOTA)-and Bi(DO3A-Bu)

2003 ◽  
Vol 42 (7) ◽  
pp. 2342-2349 ◽  
Author(s):  
Éva Csajbók ◽  
Zsolt Baranyai ◽  
István Bányai ◽  
Ernő Brücher ◽  
Róbert Király ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
1H And13c Nmr ◽  
X Ray ◽  
1H And13c Nmr Spectroscopy

1H and13C NMR Spectroscopy of mono-, di-, tri- and tetrasubstituted xanthones

1998 ◽  
Vol 36 (4) ◽  
pp. 305-309 ◽  
Author(s):  
Eduarda G. R. Fernandes ◽  
Artur M. S. Silva ◽  
José A. S. Cavaleiro ◽  
Francisco M. Silva ◽  
M. Fernanda ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
1H And13c Nmr ◽  
1H And13c Nmr Spectroscopy

Tetra(alkynyl)silanes, a 3,6-Disila-triyne, a 3,6,9-Trisila-tetrayne, a 1,3,4,6-Tetrasiladiyne, and Bis(trimethylstannyl)ethyne. Molecular Structures and Solid-state NMR Studies

2010 ◽  
Vol 65 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Ezzat Khan ◽  
Amin Badshah ◽  
Elias Molla ◽  
Peter Thoma ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Mas Nmr ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
X Ray ◽  
Solution State ◽  
Nmr Data

The molecular structures of three alkynylsilanes, tetrakis(ethynyl-p-tolyl)silane, 3,3,6,6,-tetramethyl- 3,6-disila-triyne, 3,3,6,6,9,9,-hexamethyl-3,6,9-trisila-tetrayne, and of bis(trimethylstannyl)- ethyne have been determined by X-ray diffraction. The same alkynylsilanes, and in addition 1,2- bis(trimethylsilylethynyl)-1,1,2,2-tetramethyldisliane, were studied by solid-state 13C and 29Si MAS NMR spectroscopy. The results of these measurements were compared with crystallographic evidence and also with relevant solution-state NMR data.

Contribution to the Chemistry of 2,2,6,6-Tetramethylpiperidino Aluminium Compounds

2005 ◽  
Vol 60 (10) ◽  
pp. 1027-1035 ◽  
Author(s):  
Klaus Knabel ◽  
Heinrich Nöth
Keyword(s):  
Nmr Spectroscopy ◽  
Elevated Temperatures ◽  
Molecular Structures ◽  
High Yield ◽  
Dry Ice ◽  
X Ray ◽  
Unexpected Reaction

tmpAlBr2 (tmp = 2,2,6,6-tetramethylpiperidino) was prepared from AlBr3 and tmp2AlBr at 90 °C in the absence of a solvent, but could not be crystallised from toluene or hexane because it reacted with the solvents to form tmpH·AlBr3 in high yield. tmpH·AlMeCl2, obtained from the components, decomposes at elevated temperatures but no tmpAlCl2 could be isolated. Attempts to generate the cation [tmp-Al-tmp]+ from tmp2AlBr or tmp2AlCl by halide abstraction with B(C6F5)3, Ph3C(SnCl5) or SbCl5 or from tmp2AlR (R = Me, Ph) and B(C6F5)3 have failed. An unexpected reaction occurred on treatment of tmp-B=P(tBu)AlBr3 with BH3 in THF which led to the formation of [AlBr2(thf)4][AlBr4]. The attempted synthesis of tBu2Al(tmp) from tBu2AlBr and Li(tmp) gave a product which, on exposure to CO2 at dry ice temperature, yielded the salt [(tBuAl)2(O2C(tmp))3][tBu3Al-Br-AltBu3] in low yield. All isolated products were characterized by NMR spectroscopy and by X-ray determination of their molecular structures.

1H and13C NMR Spectroscopy of Stereoisomeric 2′-deoxy-C-Nucleosides

1986 ◽  
Vol 5 (2) ◽  
pp. 287-297 ◽  
Author(s):  
Uli Hacksell ◽  
Jane Chi-Ya Cheng ◽  
G. Doyle Daves
Keyword(s):  
Nmr Spectroscopy ◽  
1H And13c Nmr ◽  
1H And13c Nmr Spectroscopy
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