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The carbon -fluorine bond length and the distortion of the benzene ring under fluorination have been determined by the isotopic substitution method for 1,3-difluorobenzene. -The experimental work was carried out predominantly by Double Resonance Modulation (DRM) microwave spec­ troscopy, which allowed all C 13 -forms to be studied in their natural abundances. The normal and the 2,4,6,-d 3  species were used as the parent molecules, and the resulting two sets of structure parameters are found to agree well with each other. With square brackets indicating consistency limits between the two sets of results deduced by the Kraitchman method, the following bond distances (in Å) and angles (in degrees) have been found:

The Doubly Determined Substitution Structure of 1,3-Difluorobenzene