4 mL of dry acetonitrile were added, and the mixture was stirred overnight. After filtration to remove a small amount of insoluble solid, the mixture was concentrated to dryness under reduced pressure. The residual oil was redissolved in 4 mL of acetonitrile, and with ice cooling, 0.16 mL of methanol was added. The mixture ... . , Acknowledgment. We thank members of our Physical Chemistry Department for Providing spectral data, @Pe- cially Mr. Gin0 Sass0 who ...