General. Elemental analyses were determined by Hoffmann-La Roche, Nutley, NJ, Pascher Microanalytical Laboratory, Bonn, Germany, and by Heterocyclic Chemical Corp., Harrisonville, Missouri. Infrared spectra were determined using a Perkin-Elmer 457 spectrophotometer. Nuclear magnetic resonance spectra were re-corded on a Varian A-60 spectrometer. All mass spectra were obtained from an AEI MS-902 spectrometer. ...