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Enriched 13C NMR of a metallated α-sulphinyl ester; temperature effect

✍ Scribed by Arlette Solladié-Cavallo; Charles Mioskowski

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
424 KB
Volume
16
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Lithium and magnesium enolates of an α‐sulphinyl ester 83% ^13^C enriched at C‐1 and C‐2 are studied by ^13^C NMR at different temperatures. It is shown that two metaliated species are present in the case of lithium which exchange at −60°C, Δ__G__≠ −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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