Studies of the solution structure of the bleomycin A2-iron(II)-carbon monoxide complex by means of two-dimensional NMR spectroscopy and distance geometry calculations

1990 ◽  
Vol 112 (21) ◽  
pp. 7462-7474 ◽  
Author(s):  
Marcel A. J. Akkerman ◽  
Eric W. J. F. Neijman ◽  
Sybren S. Wijmenga ◽  
Cornelis W. Hilbers ◽  
Wolfgang Bermel
Keyword(s):  
Carbon Monoxide ◽  
Nmr Spectroscopy ◽  
Solution Structure ◽  
Distance Geometry ◽  
Two Dimensional

Selective dismantling of closo-1,2-C2B10H12 to lower-cage dicarbaborane systems

1991 ◽  
Vol 56 (8) ◽  
pp. 1618-1635 ◽  
Author(s):  
Jaromír Plešek ◽  
Bohumil Štíbr ◽  
Xavier L. R. Fontaine ◽  
John D. Kennedy ◽  
Stanislav Heřmánek ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Solution Structure ◽  
High Yield ◽  
Two Dimensional ◽  
Oxidizing Agents ◽  
Elimination Reactions

A modified, high-yield synthesis of the two isomeric nido twelve-vertex [C2B10H13]- anions, "reactive" [nido-7,9-C2B10H13]- and "unreactive" [nido-7,12-C2B10H13]-, has been developed. A solution structure for the reactive [nido-7,9-C2H10B13]- isomer is proposed on the basis of the result of two-dimensional 11B and 1H correlation NMR spectroscopy. It is concluded that there is a marked similarity between this species and the eleven-vertex congener [nido-7,8-C2B9H12]-. In accord with this parallel, the "reactive" twelve-vertex species is found to undergo selective boron-vertex elimination reactions in the presence of oxidizing agents. These reactions give excellent yields of smaller-cage nido dicarbaborane compounds, namely [nido-7,8-C2B9H12]-, [9-(SMe2)-nido-7,8-C2B9H11], and nido-5,6-C2B8H12. NMR spectroscopy assigns cluster 11B and 1H resonances for all the compounds isolated, and thence permits comparison with the equivalent shielding patterns of structurally related analogues such as [nido-7-CB10H13]- and [nido-7,9-C2B9H12]-.

scholarly journals Solution structure of the phosphocarrier protein HPr fromBacillus subtilisby two-dimensional NMR spectroscopy

1992 ◽  
Vol 1 (10) ◽  
pp. 1363-1376 ◽  
Author(s):  
Michael Wittekind ◽  
Ponni Rajagopal ◽  
Bruce R. Branchini ◽  
Jonathan Reizer ◽  
Milton H. Saier ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Solution Structure ◽  
Two Dimensional

Solution structure of neuronal bungarotoxin determined by two-dimensional NMR spectroscopy: sequence-specific assignments, secondary structure, and dimer formation

Biochemistry ◽  
1991 ◽  
Vol 30 (20) ◽  
pp. 4901-4909 ◽  
Author(s):  
Robert E. Oswald ◽  
Michael J. Sutcliffe ◽  
Michelle Bamberger ◽  
Ralph H. Loring ◽  
Emory Braswell ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Secondary Structure ◽  
Solution Structure ◽  
Two Dimensional ◽  
Dimer Formation
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