Melting points were determined on an X-4 microscope melting point apparatus and are uncorrected. The NMR spectra were recorded in CDCl3 as a solvent (using TMS as an internal standard). The NMR and mass spectra were recorded on Jeol FX-100FT-NMR and Jeol BX 102/DA-6000 mass spectrometers, respectively. The IR spectra made for KBr discs were recorded on Buck Scientific M-500 infrared spectrophotometer. Solvent systems ...