SYNTHESIS AND CHARACTERIZATION OF ALKYLHYDRIDOTRIFLUOROPHOSPHORANES CH3PF3H AND C2H5PF3H

The compounds CH3PF3H and C2H5PF3H have been prepared by the reaction of the respective alkyltetrafluorophosphorane with trimethyltin hydride. These compounds are considerably more stable than HPF4 and H2PF3 and may be manipulated and stored in Pyrex apparatus without decomposition. Infrared spectra and 1H and 19F nmr spectra at low temperatures confirm an equatorial-substituted trigonal-bipyramidal geometry for both alkylhydridofluorophosphoranes. At room temperature the nmr spectra indicate a substantial averaging of axial and equatorial fluorine atom environments owing to intramolecular exchange processes. © 1968, American Chemical Society. All rights reserved.