Ethylene oxide gives the cyclic tetra-, penta-, and hexa-mer with BF3 in the presence of fluoroborate, fluorophosphates, or fluoroantimonates of alkali metals, alkaline earths or transitions metal.
J. Dale and K. Daasvatn, J. Chem. Soc., Chem. Commun., 1976, 295 DOI: 10.1039/C39760000295
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