The ir spectra were recorded on a Beckmann Acculab-2 spectrometer. The 'H nmr spectra were obtained on a Varian EM 390 spectrometer and a JEOL FX 90Q spectrometer in the solvents indicated. Chemical shifts are reported in ppm from TMS as an internal reference and are given in 6 units. Mass spectra were recorded on a Hewlett-Packard model 5980A mass spectrometer. Elemental analyses were performed by MHW Laboratories, Phoenix, ...
