A13C13C spin-spin coupling matrix for 1- and 2-methylnaphthalene by the two-dimensional INADEQUATE method. Correlation with π-bond orders

1984 ◽  
Vol 22 (1) ◽  
pp. 47-51 ◽  
Author(s):  
Stefan Berger
Keyword(s):  
Spin Coupling ◽  
Two Dimensional ◽  
Bond Orders ◽  
Coupling Matrix ◽  
Spin Spin Coupling

A 13C13C spin-spin coupling matrix for azulene

1984 ◽  
Vol 49 (20) ◽  
pp. 3725-3728 ◽  
Author(s):  
Stefan Berger ◽  
Klaus Peter Zeller
Keyword(s):  
Spin Coupling ◽  
Coupling Matrix ◽  
Spin Spin Coupling

Strong spin-spin coupling in the two-dimensional J-resolved 360-MHz 1H NMR spectra of the common amino acids

1981 ◽  
Vol 42 (1) ◽  
pp. 73-87 ◽  
Author(s):  
Gerhard Wider ◽  
Rudolf Baumann ◽  
Kuniaki Nagayama ◽  
Richard R Ernst ◽  
Kurt Wüthrich
Keyword(s):  
Amino Acids ◽  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
Spin Coupling ◽  
Two Dimensional ◽  
The Common ◽  
Spin Spin Coupling ◽  
Strong Spin

scholarly journals Sign-Determination of Spin-Spin Coupling Constants in tert-Butylphosphaalkyne

1992 ◽  
Vol 47 (3) ◽  
pp. 437-438
Author(s):  
Bernd Wrackmeyer
Keyword(s):  
Coupling Constants ◽  
Spin Coupling ◽  
Positive Sign ◽  
Two Dimensional ◽  
Tert Butyl ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling ◽  
Sign Determination

The signs o f the coupling constants 1J(31P≡13C) ( > O ) , J(31P13C) ( > O ) , 3J(31P13C) ( > O ) and 4J(31P1H) ( > O ) in tert-butyl-phosphaalkyne (1) were determined by selective 1H {31P} NMR experiments and two-dimensional (2 D ) 13C/1H heteronuclear shift correlations based on nJ(13C1H ) (n = 1,2,3), confirming the previously assumed positive sign of 1J( 31P≡13C) in phosphaalkynes.

Determination of Absolute Signs of 119Sn-117Sn Spin-Spin Coupling Constants

1994 ◽  
Vol 49 (10) ◽  
pp. 1407-1409 ◽  
Author(s):  
Bernd Wrackmeyer ◽  
Gerald Kehr
Keyword(s):  
Long Range ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Two Dimensional ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling ◽  
First Time

AbstractIf for a given system two-dimensional (2D) 119Sn/1H heteronuclear shift correlations can be established for long range coupling constants nJ(119Sn,1H) (n = 4, 6), absolute signs of coupling constants J(Sn,Sn) are accessible by this technique for the first time. This has been demonstrated for tetrakis(trimethylstannyl)allene (1) with 2J(119Sn,117Sn) (>0) and 4J(Sn. 117Sn) (<0) and for tris(trimethylstannyl)phosphane (2) and bis(trimethvlstannyl)- sulfane (3) with 2J(119Sn,117Sn) (<0).

Long-range Spin–Spin Coupling in Pyrimidine Nucleosides

1971 ◽  
Vol 49 (12) ◽  
pp. 2111-2118 ◽  
Author(s):  
Frank E. Hruska
Keyword(s):  
Aqueous Solution ◽  
Long Range ◽  
Spin Coupling ◽  
Bond Orders ◽  
Pyrimidine Nucleosides ◽  
Anti Conformation ◽  
Spin Spin Coupling ◽  
Uracil Base

A study has been made of the 100 MHz p.m.r. spectra of a number of pyrimidine nucleosides in aqueous solution. Long-range five-bond spin–spin coupling interactions between the H-5 and H-1′ hydrogens were noted in uridine, 2′-deoxyuridine, 6-azauridine, and 6-azacytidine and rationalized by a predominantly anti conformation for each nucleoside. The absence of a detectable five-bond coupling in orotidine suggested that the syn conformation is preferred in this instance. The relative magnitudes of the four-bond and five-bond interactions in uridine and pseudouridine were shown to be consistent with the calculated mobile π-bond orders of the C6—N1 and C6—C5 bonds of the uracil base.

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