References
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- Infrared spectra were recorded on either a Perkin-Elmer Model 457 infrared spectrometer or a Nicolet MXS FT IR as thin films or nujol mulls. NMR spectra were obtained in CCl4, DCDl3, or Me2SO - d6 solutions [(CH3)4 Si internal standard] at 60 MHz with a Varian EM-360 spectrometer. Mass Spectra were obtained on a Hitachi Perkin-Elmer RMU-6E spectrometer. All boiling points and melting points are uncorrected and melting points were recorded on a Fisher-Johns melting-point apparatus.