The IH NMR (90 MHz) and 19F NMR (90 MHz) spectra were obtained on a Varian EM-390 NMR spectrometer. Chemical shifts are reported in ppm downfield relative to external Me,% for'H NMR and internal CFC13 for 19F NMR, with CDCl, as the solvent in both cases. The microanalysis was performed by Atlantic Microlab, Inc., Norcross, GA. The 5% F, in N, was supplied by Air Products. Solvents used (DMF and THF) were distilled from sodium ...
