sured in MeOH at 28 C on a Perkin-Elmer 241 polarimeter.
UV absorptions were measured in MeOH on a
Shimadzu UV-240 spectrophotometer and IR spectra
were recorded in KBr discs on a Perkin-Elmer 283
double beam spectrophotometer. 1H and 13C NMR
spectra were recorded on Bruker Avance 400 and AC
300 spectrometers using DMSO-d6 and CDCl3 with