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Enriched 13 C NMR of a metallated α‐sulphinyl ester; temperature effect
Author(s) -
SolladiéCavallo Arlette,
Mioskowski Charles
Publication year - 1981
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270160405
Subject(s) - chemistry , magnesium , lithium (medication) , proton nmr , carbon 13 nmr , medicinal chemistry , inorganic chemistry , organic chemistry , medicine , endocrinology
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.