N.m.r. spectra of the Et2CO–BF3 1 : 1 complex in CHCl2F solution at temperatures below –120° show separate signals from the two ethyl groups, attributed to cis–trans-isomerism about the carbon–oxygen bond.
U. Henriksson and S. Forsén, J. Chem. Soc. D, 1970, 1229 DOI: 10.1039/C29700001229
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