Enriched 13C NMR of a metallated α-sulphinyl ester; temperature effect |
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Authors: | Arlette Solladi-Cavallo Charles Mioskowski |
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Institution: | Arlette Solladié-Cavallo,Charles Mioskowski |
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Abstract: | Lithium and magnesium enolates of an α-sulphinyl ester 83% 13C enriched at C-1 and C-2 are studied by 13C NMR at different temperatures. It is shown that two metaliated species are present in the case of lithium which exchange at ?60°C, ΔG≠ ?60° = 37.8 KJ mol?1 (9.05 Kcal mol?1) and that there is no rapid exchange between the non-metallated ester and the metallated species (on the NMR time scale). In the case of magnesium, two or three metallated species are formed, according to the temperature which do not exchange up to 0 °C. |
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