THE STRUCTURE OF STRYCHNOSPERMINE EVIDENCE FROM DOUBLE IRRADIATION AND VARIABLE TEMPERATURE N.M.R.

1963 ◽  
Vol 41 (4) ◽  
pp. 883-888 ◽  
Author(s):  
F. A. L. Anet
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectrum ◽  
Room Temperature ◽  
Resonance Spectrum ◽  
Variable Temperature ◽  
Aromatic Proton ◽  
Methyl Group ◽  
Restricted Rotation ◽  
Acetyl Group

The nuclear magnetic resonance spectrum of strychnospermine has been measured at −20°, room temperature, and at +80°. The changes observed are attributed to restricted rotation in the N-acetyl group. At room temperature the rate of rotation is such that the band of one aromatic proton is extremely broad and therefore almost invisible. Double irradiation has been used to determine the environment of the C-methyl group of the alkaloid. The n.m.r. results confirm the structure previously postulated.

13C-Nuclear Magnetic Resonance Spectrum of Tropolone

1972 ◽  
Vol 50 (12) ◽  
pp. 1975-1977 ◽  
Author(s):  
Larry Weiler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectrum ◽  
Room Temperature ◽  
Resonance Spectrum ◽  
Tautomeric Equilibrium ◽  
Charge Densities ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Overhauser ◽  
Nuclear Magnetic

The 13C-n.m.r. spectrum of tropolone has been obtained and it clearly shows that there is a rapid tautomeric equilibrium at room temperature. The peaks have been tentatively assigned using calculated π charge densities and nuclear Overhauser enhancements.

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