| Autor: |
Boykin, David W., Baumstark, Alfons L., Kayser, Margaret M., Soucy, Chantal M. |
| Zdroj: |
Canadian Journal of Chemistry; June 1987, Vol. 65 Issue: 6 p1214-1217, 4p |
| Abstrakt: |
17O chemical shift data (natural abundance) for 3-substituted phthalic anhydrides and 4- and 7-substituted phthalides in acetonitrile at 75 °C are reported. Steric interactions of substituents orthoto the carbonyl groups result in deshielding effects (9–22 ppm) relative to parent compounds regardless of the electronic character of the substituents. Factors contributing to the deshielding effects are discussed. The relationship between 17O chemical shifts and regiochemistry of the phthalic anhydrides is discussed. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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