Melting points were determined with a Mel-Temp apparatus and are uncorrected. NMR spectra were obtained on Varian A-60 and T-60 spectrometers in deuterated chloroform solution, using tetramethylsilane as internal standard. Infrared spectra were taken in a Beckman IR-8 spectrometer. Elemental analyses were performed by Atlantic Microlab, Atlanta, GA, or by Galbraith Laboratories, Inc., Knoxville, TN.
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