The reaction of W(CO)5with 21-crown-7 in the presence of H2O and HCl(g) in toluene has yielded [H5O2+·21-crown-7][WOCl5–], a complex exhibiting a bowl-like conformation for the 21-crown-7 molecule which is bound to an H5O2+ ion in the unusual, high energy cis conformation.
P. C. Junk and J. L. Atwood, J. Chem. Soc., Chem. Commun., 1995, 1551 DOI: 10.1039/C39950001551
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