Fluorinated macrocyclic ethers as fluoride ion hosts. Novel structures and dynamic properties

Zvi Rappoport*, Silvio E. Biali, Menahem Kaftory

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

115 Scopus citations


Thirty-eight crystallographically independent structures of thirty-two benzophenones were retrieved from the Cambridge Structural Data Base. All except one show an helical propeller conformation. The torsional angles of the two rings Φ1 and Φ2 were plotted one against the other in order to identify the threshold enantiomerization mechanism by applying the structural correlation method to the potential ring-flip processes. Molecular mechanics (MM) calculations on benzophenone gave the corresponding calculated potential energy surface. An excellent agreement with the calculated route for a one-ring flip was obtained from the conformational map of the crystallographic data, especially in benzophenones where the C̿0 bond is involved in intramolecular hydrogen bonding. The strong preference for this route is rationalized by the tendency to maximize the Ar-C̿0 conjugation interaction during the rotation. The structural correlation method can be used also to evaluate trends in the changes of the structural parameters, such as bond lengths and angles in approaching the rotational transition state. Similar trends are obtained from analysis of the X-ray data and from MM calculations on the one-ring flip of benzophenone.

Original languageAmerican English
Pages (from-to)7707-7718
Number of pages12
JournalJournal of the American Chemical Society
Issue number21
StatePublished - Jan 1990


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