A novel method for correlation of substituent constants in some aromatic esters using the shift reagent Eu(fod)3
✍ Scribed by K. Ranganayakulu; Ranjana Dubey; K. Rajeswari
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- French
- Weight
- 219 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
The lanthanide induced chemical shifts of the ester methyl group were studied in eighteen m-, and p-substituted aromatic methyl esters with varying amounts of added shift reagent, Eu(fodl 3. Each time the lanthanide induced shift (LIS) was plotted against the molar ratio of shift reagent (SR)/substrate and astraightline was obtained upto one mole ratio of added shift reagent. The slopes of these plots correlated well with the Hanunett's 0 constants and yield a value of -4.95 for the reaction constant p .
The method is therefore one of the simplest ways of correlating the substituent constants in aromatic esters.