Fluorine Magnetic Resonance Spectra of some Mono- and Disubstituted Tetrafluorocyclobutanes

Abstract

The fluorine magnetic resonance spectra of a series of tetrafluorocyclobutane molecules substituted unsymmetrically with respect to the plane of the cyclobutane ring are reported. The complex spectra of these compounds are interpreted in terms of nonequivalence of fluorine atoms bonded to a common ring carbon atom. Nonequivalence of fluorine atoms bonded to a common carbon atom is discussed in terms of restricted rotation about C–C bonds in cyclic structures and possible intramolecular interaction mechanisms for producing the nonequivalence.