✦ LIBER ✦
Vitamin B-6 model reactions. Part VI-a Hammett relationship for the magnitude of pseudoallylic proton-proton spin coupling constants in substituted azomethines
✍ Scribed by James R. Fischer; Edwin H. Abbott
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 222 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Four-bond protoeproton spin coupling constants were measured between the azomethine proton and the glycine CH protons of some coordinated glycine Schiff bases where the parent aldehyde is aromatic. Such systems are models for vitamin B, enzyme substrate complexes. It is demonstrated that the coupling constants are not only related to the dihedral angles between coupled systems but they are also linearly related to the Hammett ( I value of the substituents on the aromatic ring. A method is suggested for the calculation of dihedral angles between protoocarbon bonds in these pseudoallylic systems.