2021
DOI: 10.1002/ejoc.202101351
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Ring Opening and Closure Reactions of β‐Propiolactone in the Superacids HF/MF5 (M=Sb, As)

Abstract: Transformations of β‐propiolactone in the binary superacidic systems HF/MF5 (M=Sb, As) were investigated at different temperatures. Salts of monoprotonated 3‐hydroxypropanoyl fluoride [H2O(CH2)2C(O)F][SbF6] (1) and [H2O(CH2)2C(O)F][AsF6] (2) were obtained by performing the reactions at temperatures lower than −40 °C. In contrast, temperatures higher than −40 °C yield the respective salts [C9H15O6][SbF6]3 (3) and [C9H15O6][AsF6]3 (4) containing a cyclic trication. The protonated species of β‐propiolactone was n… Show more

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