Total Synthesis of (-)-Tetrahydrolipstatin by the Tandem Mukaiyama-aldol Lactonization

（-）-Tetrahydrolipstatin 1 was synthesized in three steps and 33.8% overall yield from aldehyde 6 by tandem Mukaiyama-aldol lactonization, which offered a concise, efficient and highly diastereoselective route to this antiobesity drug. We also presented a resolution method for preparation of the crucial intermediate, β- （t-butyldimethylsilyloxy）tetradecanal.

磁性吸附材料在氨氮废水处理中的研究进展

性高、可循环利用等特点,适用于氨氮废水的预处理、深度处理以及应急处理。本文简述了磁性吸附材料的吸附机理,分析了不同吸附条件下的饱和吸附量、经济投加量以及循环再生量等影响因素,总结了其在不同浓度下氨氮废水的研究进展,并指出了磁性吸附材料在废水处理方面的研究方向。