A Convenient Synthetic Method of Metal Dendritic Porphyrins

Metal porphyrins are natural antioxidant reagent1-3. However, due to the characteristics of structures, they are only soluble in inorganic acids and part of polar organic solvents. Thus, it is limited to be used as effective pharmaceutical preparations. T…     

脱乙酰基对天然魔芋葡甘聚糖分子形貌的影响

通过原子力显微镜直接观察魔芋葡甘聚糖（KGM）分子的三维结构形貌，KGM水溶液铺展在经Ca^2 处理的云母片上，干燥固定后，可获得稳定，重复的图像，实验结果表明，稀溶液中KGM分子具有伸展的螺旋链状结构，单股的长度达200－400nm，厚度为1．0nm，宽度为35．0－35．2nm，脱乙酰后分子链卷曲成直径约40－50nm,厚3．5－5．0nm的弹性圆台状。     

化学计量学在有机物电分析化学中的应用

化学计量学在有机物电分析化学中的应用日益广泛，并发挥重要的作用。本文就化学计量学方法在色素、抗氧化剂、维生素、氨基酸、环境污染物、农药及药物等电分析化学方面的应用作一综述。引用参考文献58篇。     

大环二萜天然产物(±)-Mayol的全合成

西松烷型二萜类化合物是一大类广泛分布于松脂、烟草、陆地动物及海洋生物体中的具有十四元碳环骨架的化合物.其结构新颖复杂,且大多具有显著和广谱的生物活性.近几十年来,有关这类化合物的研究已引起了人们的极大兴趣.因此,开展这类天然产物及其类似物的全合成及构效关系的研究不仅具有重要的学术价值,而且具有潜在的应用前景.     

Synthesis of Obyanamide, a Marine Cytotoxic Cyclic Depsipeptide

Obyanamide 1 is a cyclic depsipeptide that was recently isolated from the marine cyanobacterium Lyngbya confervoides by Moore and co-workers1. This compound displayed a potent inhibitory effect on both KB and LoVo cells in vitro. Several structural analog…     

单重态氧化学 V: 二烷基取代酚光敏氧化反应的研究

本文研究了2,6-二甲基酚、2,4-二甲基酚及3,4-二甲基酚的光敏氧化反应, 应用竹红菌甲素作敏化剂匹配高压钠灯首次提供了二烷基取代酚同单重态氧发生化学反应的例证, 并测定了它们对单重态氧的反应速度常数, 其反应活性顺序为:BHT>2,4-DMP>3,4-DMP>DBP>2,6-DMP.二烷基取代酚同单重态氧可能通过1,4-环加成反应的机理, 再经重排生成最终产物.     

利用天然斜发沸石从高离子强度的强碱性溶液中吸附和洗脱K+和Rb+的研究

在80℃下，用间歇法研究了NH4^ 型天然斜发沸石对某厂高离子 强碱性循环液中的K^ 和Rb^ 的吸附，得到不同粒度天然斜发沸石对K^ 和Rb^ 的交换吸附量，用不同浓度的NH4HCO3溶液对沸石进行洗脱再生，是到洗脱速率随着洗脱液浓度增大而增大。本文对沸石与钾含量很高的高离子强度强碱性溶液中碱金属的交换吸附和洗脱过程进行了初步探讨。     

Two new compounds from Zingiber officinale

A new cyclic diarylheptanoid,1,5-epoxy-3-hydroxy-1-(3-methoxy-4,5-dihydroxyphenyl)-7-(4-hydroxyphenyl)-heptane (1),as well as a new monoterpene,10-O-β-D-glucopyranosyl-hydroxy cineole (2) were isolated from the rhizomes of Zingiber officinale. The structures of compounds 1 and 2 were established based on their spectral data.In addition,the antioxidant activities of these compounds were also measured.     

Use of Silicon Substituents in the Syntheses of Natural and Non-natural Molecules

Trimethylsilyl groups have been used in our research as a director as well as a bulky and lipophilic group in our quest for natural and non-natural molecules.