One‐ and two‐dimensional exchangeJ‐resolved CP‐MAS NMR spectrum of adamantane

1986 ◽  
Vol 84 (4) ◽  
pp. 2084-2090 ◽  
Author(s):  
K. Takegoshi ◽  
C. A. McDowell
1997 ◽  
Vol 16 (24) ◽  
pp. 5218-5222 ◽  
Author(s):  
Xavier Helluy ◽  
Jörg Kümmerlen ◽  
Angelika Sebald

1987 ◽  
Vol 20 (7) ◽  
pp. 1554-1556 ◽  
Author(s):  
J. M. Willis ◽  
F. G. Herring

1990 ◽  
Vol 55 (1) ◽  
pp. 193-201 ◽  
Author(s):  
Antonín Lyčka ◽  
Miroslav Nečas ◽  
Josef Jirman ◽  
Jaroslav Straka ◽  
Bohdan Schneider

The 1H and 15Nα-enriched 1-phenylazo-3-X-2-naphthols, where X = COOH (I), X = COOCH3 (II), and X = CONHC6H5 (III), have been measured in various solvents. The values of 1J(15Nα, H) and σ(15N) indicate that in CDCl3, C6D6, CCl4, and CD3NO2 solutions the compounds I and III exist practically completely in their hydrazone forms. The hydrazone form is stabilized by the hydrogen bond of COOH or CONH protons to the C(2)=O group. The compound II represents an equilibrium mixture of azo and hydrazone forms, since it cannot form a similar hydrogen bond. Moreover, the 15N NMR spectra of compounds I-III have been measured in solid state by the CP/MAS technique. The results indicate the existence of two conformers differing by the conformation of COOCH3 group in compound II, which is supported by the 13C CP/MAS NMR spectrum of compound II.


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