✦ LIBER ✦
1H NMR additive shielding coefficients (Z) for organoseleno groups in vinyl selenides
✍ Scribed by Helena M. C. Ferraz; Jaão V. Comasseto; Carlos A. Brandt
- Book ID
- 102528925
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 247 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
Additive shielding parameters for the phenylseleno group (ZphSe-gm = 1.36; GhSe.& = 0.31; &hSe-wam = 0.29) have been estimated. Examples of the calculation of chemical shifts for olefinic protons in vinylic selenides by means of these increments are given. A comparison with 2-pyridylseleno and methylseleno substituents has been made. The standard deviations of the z values are 0.06 for &hSe.gm, 0.10 for G h S e -& and 0.05 for &hSe-mm. KEY WORDS Vinylic selenides Proton NMR Z,m* 0.23 0.28 0.25 0.31 0.24 0.22 Ref.