Melting points were determined in open capillary tubes using a Thomas-Hoover apparatus and are corrected. Microanalyses were performed by the Laboratory's Section on Microanalytical Services and Instrumentation. Ir (Perkin-Elmer 21), NMR (Varian A-60 or HR- 220), and mass (Hitachi Perkin-Elmer RMU 6E) spectra were consistent with the assigned structures.
