二次结晶形成的具有增强光催化性能的镶嵌结构ZnO

Zinc acetate is used as a raw material to synthesize the desired ZnO in hot solvent by controlling the amount of citric acid (CA) added. Notably, the amount of CA added has a significant relationship with the control of the morphology of ZnO. Spherical ZnO wrapped in nanosheets is synthesized through the secondary crystallization of Zn2+. The optical properties of the ZnO sample are tested through the degradation of organic pollutants. Notably, the photocatalytic properties of ZnO vary with the different amounts of CA added. Exposure of the active crystal face increases the photocatalytic activity of ZnO. In addition, the number of defects on the surface of the ZnO sample increases because of its large specific surface area, thus changing the bandgap of ZnO. Therefore, the resulting sample can respond under visible light.     

酰基保护的4-氨基-3,4-二氢-1(2H)-萘酮的立体选择性还原反应

1,2,3,4-四氢-1-萘胺及其衍生物是一类重要的药物合成中间体.从光学纯的(R)-和(S)-1,2,3,4-四氢-1-萘胺出发,首先经乙酰化、苯甲酰化和邻苯二甲酰化反应制备相应酰胺,然后在高锰酸钾作用下氧化生成了氨基萘酮衍生物,收率为65%～85%.这些不同酰基保护的氨基萘酮衍生物经硼氢化钠(NaBH4)和二异丁基氢化铝(DIBAL-H)还原后得到两种构型的氨基萘醇混合产物,经二维核磁共振氢谱的核磁欧沃豪斯效应(NOE)推断,此还原反应的主产物是顺式构型的氨基萘醇,当(R)-或(S)-邻苯二甲酰化的氨基萘酮经DIBAL-H还原后主产物为顺式的氨基萘醇4ca和7ba,其非对映异构体过量(de)百分比分别为92.6%和98.2%.