An asymmetric total synthesis of mansonone P and R were achieved, in whichintroduction of hydroxy substituent at position 2 was performed by Sharpless dihydroxylation ofsily enol ether.
a new highly oxygenated eremophilenolide was isolated from Ligulariopsis shichuana. Its structure was elucidated by NMR spectroscopic and X-ray diffraction methods.
A new photocatalyst, TiO_2 powder immobilized on polystyrene (PS) thin films,was prepared using a novel method and its photocatalytic activity on the photodegradation ofacridine dye in aqueous solution was tested. By this method, the crystal form and grain size of theimmobilized TiO_2 were well maintained. Compared with TiO_2 powder, the photocatalytic activity ofTiO_2/PS thin films was not significantly reduced. The catalyst is stable and can be reused severaltimes without the loss of activity, which makes wastewater treatment using this photocatalyticdegradation technique of this way possible in the practical application.
GAO Yuan, YU Wei, CHEN Baohua, MA Yongxiang, and LI HulinDepartment of Chemistry, Lanzhou University, Lanzhou 730000, China (Receeived 2002-02-26)
