A novel method for correlation of substituent constants in some aromatic esters using the shift reagent Eu(fod)3 |
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Authors: | K. Ranganayakulu Ranjana Dubey K. Rajeswari |
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Affiliation: | Department of Chemistry, Banaras Hindu University Varanasi-221005, U.P., India;Department of Chemistry, University of Calgary Calgary, Alberta, T2N 1N4, Canada |
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Abstract: | 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(fod)3. Each time the lanthanide induced shift (LIS) was plotted against the molar ratio of shift reagent (SR)/substrate and a straight line was obtained upto one mole ratio of added shift reagent. The slopes of these plots correlated well with the Hammett's σ constants and yield a value of ?4.95 for the reaction constant ?. The method is therefore one of the simplest ways of correlating the substituent constants in aromatic esters. |
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