Strukturrevision und Aufklärung der Biosynthese von Hypodoratoxid durch ein13C,13C-COSY-NMR-Experiment

2015 ◽  
Vol 127 (22) ◽  
pp. 6737-6740 ◽  
Author(s):  
Lena Barra ◽  
Kerstin Ibrom ◽  
Jeroen S. Dickschat
Keyword(s):  
Cosy Nmr

Two dimensional 29Si-29Si INEPT DQF COSY NMR for the structure of alkoxysilane polymers in solution

1994 ◽  
Vol 91 ◽  
pp. 409-418 ◽  
Author(s):  
P Lux ◽  
F Brunet ◽  
H Desvaux ◽  
J Virlet
Keyword(s):  
Two Dimensional ◽  
Cosy Nmr

1H NMR Conformational Studies in Water of Angiotensin II Analogues Modified at the N- and C-Termini: Interactions of the Aromatic Side Chains and Folding of the N-Terminal Domain

1994 ◽  
Vol 59 (11) ◽  
pp. 2523-2532 ◽  
Author(s):  
John Hondrelis ◽  
John Matsoukas ◽  
George Agelis ◽  
Paul Cordopatis ◽  
Ning Zhou ◽  
...  
Keyword(s):  
Shielding Effect ◽  
Resonance Spectroscopy ◽  
Nmr Studies ◽  
Previous Suggestion ◽  
Aminoisobutyric Acid ◽  
H Nmr ◽  
Neutral Ph ◽  
Angiotensin Ii Analogues ◽  
Proton Resonances ◽  
Cosy Nmr

The conformation of [Sar1]angiotensin II in water at neutral pH has been examined by proton magnetic resonance spectroscopy at 400 MHz and in particular by comparing its 1H NMR spectral data with those of analogues modified at positions 1,4 and 6, namely [Sar1,Cha8]ANGII, [Des Asp1,Cha8]ANGII, [Aib1,Tyr(Me)4]ANGII, [Aib1,Tyr(Me)4,Ile8]ANGII, [N-MeAib1,Tyr(Me)4]ANGII, [N-MeAib1,Tyr(Me)4,Ile8]ANGII, ANGIII and [Sar1,Ile8]ANGII. Assignment of all proton resonances in these analogues was made possible by 2D COSY NMR experiments. The H-2 and H-4 protons for the histidine ring in [Sar1]ANGII, ANGII and ANGIII were shielded compared with the same protons in [Sar1,Ile8]ANGII, [Sar1,Cha8]ANGII and [Des Asp1,Cha8]ANGII; this shielding effect was not disturbed upon methylation of the tyrosine hydroxyl and/or replacement of residue 1 (sarcosine or aspartic acid) with aminoisobutyric acid (Aib) or N-methyl aminoisobutyric acid (N-MeAib). These data are consistent with our previous suggestion based on NMR studies in neutral DMSO that a characteristic folded conformation for ANGII previously observed in non-polar solvents can also be detected in water at neutral pH, but to a lesser degree.

Radiation damping artifacts in 2D COSY NMR experiments

1996 ◽  
Vol 261 (4-5) ◽  
pp. 421-424 ◽  
Author(s):  
G.E. Ball ◽  
G.J. Bowden ◽  
T.H. Heseltine ◽  
M.J. Prandolini ◽  
W. Bermel
Keyword(s):  
Radiation Damping ◽  
Cosy Nmr

Zwölfgliedrige Heteroborancluster durch Copyrolyse von Tetrachlordiboran(4) mit Elementhalogeniden/ Twelve-Vertex Heteroborane Clusters by Copyrolysis of Tetrachlorodiborane(4) and Element Halides

1997 ◽  
Vol 52 (2) ◽  
pp. 221-226 ◽  
Author(s):  
Wolfgang Einholz ◽  
Ronald Schäfer ◽  
Willi Keller ◽  
Bernhard Vogler
Keyword(s):  
Nmr Spectroscopy ◽  
Icosahedral Structure ◽  
Cosy Nmr

Abstract The perchlorinated arsaboranes closo-1,2-As2B10Cl10 and As4B8C16 are formed in the co­ pyrolysis of B2C14 and AsCl3 at temperatures of 330-450°C. The icosahedral structure of closo-1,2-As2B10Cl10 is confirmed by 11B-11B-COSY-NMR spectroscopy. As4B8Cl6 is suppo­ sed to be a conjuncto-borane (As2B4Cl3)2 with two boron-boron linked As2B4Cl3 octahedra. The copyrolysis of B2Cl4 andSbCl3 or SbCl5 yields Sb2B10Cl10, and the corresponding reaction of B2Cl4 with S2Cl2 gives the icosahedral thiaborane cluster SB11Cl11 .

11B-11B cosy NMR studies of derivatives of the octahydrotriborate anion, [B3H7(X)]− and [B3H6(X)2]−

Polyhedron ◽  
1986 ◽  
Vol 5 (10) ◽  
pp. 1639-1643 ◽  
Author(s):  
Dominic G. Meina ◽  
John H. Morris ◽  
David Reed
Keyword(s):  
Nmr Studies ◽  
Derivatives Of ◽  
Octahydrotriborate Anion ◽  
Cosy Nmr
Sign in / Sign up

Export Citation Format

Share Document