References
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- Infrared spectra were recorded on a Perkin-Elraer Model 1420 infrared spectrometer as thin films or nujol mulls. NMR spectra were obtained in CDCl3, or Me2SO - d6 solutions, (CH3)4 Si internal standard, at 200 MHz with a Varian Gemini 200 spectrometer. All boiling points and melting points are uncorrected and melting points were recorded on a Fisher-Johns melting point apparatus.