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18) All compounds reported In this paper are racemic. For convenience, only one enantiomer has been shown. (19) All melting points were determined in a Thomas-Hoover melting point apparatus and are corrected; uv spectra were taken In ethyl alcohol with a Cary Model 14M spectrophotometer; lr spectra were taken with a Beckman IR-9 recording spectrophotometer; nmr spectra were taken In CDCI3 on a Varían A-60 or HA-100 spectrometer with tetramethylsllane as an internal standard.

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