Nuclear magnetic resonance spectra of the ABX3 type: Field dependence and relative signs of spin-spin coupling constants
The ABX3 spin system is studied as a function of applied magnetic field. A method for the determination of the relative signs of J AX and JBX, together with the relative chemical shifts and coupling constants is described. The results are applied to the cis crotonic acid, the trans crotonic acid, it...
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Autores principales: | , |
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Formato: | JOUR |
Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00219606_v33_n6_p1794_Kowalewski |
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Sumario: | The ABX3 spin system is studied as a function of applied magnetic field. A method for the determination of the relative signs of J AX and JBX, together with the relative chemical shifts and coupling constants is described. The results are applied to the cis crotonic acid, the trans crotonic acid, its methyl ester, and N-methylformamide. In the latter case it is shown that the relative chemical shift of the A and B protons can be estimated from the field behavior of the X3 group of lines. |
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