Nuclear magnetic resonance studies of two-iron-two-sulfur ferredoxins. 3. Heteronuclear (carbon-13, proton) two-dimensional NMR spectra, 13C peak assignments, and 13C relaxation measurements

Biochemistry ◽  
1983 ◽  
Vol 22 (25) ◽  
pp. 5996-6002 ◽  
Author(s):  
Tze Ming Chan ◽  
John L. Markley
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Spectra ◽  
Two Dimensional ◽  
Magnetic Resonance Studies ◽  
Relaxation Measurements ◽  
13C Relaxation ◽  
Nuclear Magnetic

13C nuclear magnetic resonance studies. 58. 13C spectra of a variety of bicyclo[2.2.2]octane derivatives. Further definition of the deshielding δ effect

1976 ◽  
Vol 54 (6) ◽  
pp. 917-925 ◽  
Author(s):  
J. B. Stothers ◽  
C. T. Tan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Spectra ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Definition Of ◽  
C Nmr ◽  
Nuclear Magnetic

The 13C nmr spectra of 35 bicyclo[2.2.2]octane and -octene derivatives have been determined to extend our examinations of the effects of stereochemistry on the shieldings of closely neighboring carbons. This series includes a variety of methyl substituted bicyclooctanols and -octenols as well as the corresponding hydrocarbons and some bicyclooctanones. With the bicyclo[2.2.2]octane skeleton it is possible to examine an array of systems having substituents separated by three and four bonds in a variety of orientations. The interactions, termed γ and δ effects, respectively, produce distinctive shielding variations which are useful for stereochemical elucidations. Particularly interesting are the pronounced shifts observed for the carbons bearing closely neighboring substituents. Characteristically, for vicinal substituents, these carbons are shielded while for syn-axial δ interactions, these carbons are deshielded by as much as 8.6 ppm. The results are compared with the trends found in other sterically crowded Systems.

125Te Fourier transform nuclear magnetic resonance studies of tellurium compounds

1982 ◽  
Vol 60 (17) ◽  
pp. 2256-2258 ◽  
Author(s):  
Raj K. Chadha ◽  
Jack M. Miller
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Magnetic Resonance ◽  
Phenyl Ring ◽  
Nmr Spectra ◽  
Broad Line ◽  
Magnetic Resonance Studies ◽  
Line Widths ◽  
Organotellurium Compounds ◽  
Nuclear Magnetic

125Te nmr spectra of a number of organotellurium compounds and inorganic tellurium salts are reported. The tellurium shielding has been found to be dependent upon the nature and number of electronegative substituents bonded to tellurium and where applicable, upon the para substituents on the phenyl ring. Possible reasons for the observed broad line widths are discussed.

Two-dimensional nuclear magnetic resonance of sesquiterpenes. 4—Application to complete assignment of1H and13C NMR spectra of some aromadendrane derivatives

1991 ◽  
Vol 29 (9) ◽  
pp. 969-971 ◽  
Author(s):  
Robert Faure ◽  
Armand R. P. Ramanoelina ◽  
Olivier Rakotonirainy ◽  
Jean-Pierre Bianchini ◽  
Emile M. Gaydou
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Spectra ◽  
Two Dimensional ◽  
Complete Assignment ◽  
Nuclear Magnetic
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