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1H and 13C NMR determination of the relative stereochemistry of the diastereomers resulting from the reaction of sily enol ethers with the 1-ethoxy-1-propargylium dicobalt hexacarbonyl cation

✍ Scribed by Angel M. Montaña Pedrero; Kenneth M. Nicholas

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
914 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The application of ^1^H and ^13^C NMR correlations and phase‐sensitive NOESY in the stereochemical assignment of four diastereoisomers of hexacarbonyl{μ‐η^4^‐[2,4‐dimethyl‐2‐(1‐ethoxy‐2‐propyn‐1‐yl)‐8‐oxabicyclo [3.2.1] octan‐3‐one]}dicobalt‐(CoCo) is reported.

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## Abstract The reaction of 2,4‐pentanedione (**1**) with (__R__)‐(—)‐2‐phenylglycine methyl ester (**2**), (__R__)‐(—)‐2‐phenylglycinol (**3**) and the proteinogenic amino acids (2__S__,3__R__)‐(—)‐2‐amino‐3‐hydroxybutyric acid (L‐threonine) (**4**) and (__R__)‐(—)‐2‐amino‐3‐mercaptopropionic acid