乳液聚合法制备水分散有机硅聚合物

乳液聚合法是制备水性有机硅聚合物的最有效、最常用的方法。本文从乳液聚合所采用的有机硅单体或预聚物、乳液聚合工艺、乳液体系的稳定性等方面，论述了采用乳液聚合法合成水性有机硅聚合物领域所面临的问题及所取得的研究进展。     

四环三萜烷的一个新系列生物标志物——羊毛甾烷(C_(30)-C_(32))

一个新系列四环三萜烷C_(30)—C_(32)羊毛甾烷,于中国中部泌阳凹陷的第三系地层中检出。这些化合物通过GC,GC—MS以及与合成标样共标共注,确定为8β(H),9α(H)-羊毛甾烷(C_(30)),24-甲基羊毛甾烷(C_(31))和24-乙基羊毛甾烷(C_(32))。本文讨论了这些生物标志物的可能形成机制以及地质命运。     

手性氨基醇催化的前手性芳酮的不对称还原反应

首次以天然D-樟脑的衍生物为原料, 合成了两个新型龙脑基氨基醇配体, 研究了它们与硼烷原位制备成手性噁唑硼烷后, 在不对称催化氢化还原前手性芳酮中的性能, 得到的手性仲醇的对映体过量(ee)值最高可达96%, 还考察了反应温度、时间、溶剂等因素对苯乙酮的不对称氢化还原的化学产率和光学收率的影响.     

新型的含硫族元素碳硼烷配体的三(3，5-二甲基-1-吡唑)硼氢钼配合物的合成和分子结构(英)

三齿单核三(3，5-二甲基-1-吡唑)硼氢钼配合物Tp^*Mo(O)Cl₂ (1)(Tp^*=三(3，5-二甲基-1-吡唑)硼氢HB(C₃H(Me₂)N₂)₃)与含硫族元素碳硼烷的锂盐[(THF)₂LiE₂C₂B₁₀H₁₀(THF)]<     

2-取代-3-芳基-4-噻唑啉(硫)酮衍生物的合成、晶体结构和生物活性

从2-取代-3-芳基-4-噻唑啉酮(4a～4e和5)合成了三个系列新型噻唑啉酮衍生物, 即5-芳基亚甲基-4-噻唑啉酮(6a～6j), 4-噻唑硫酮(7a～7e和8)和4-氰基亚胺基噻唑烷(11a～11e和12). 中间体4a～4e和5由醛、胺和巯基乙酸缩合得到. 所有化合物的结构均经元素分析和¹H NMR确证, 并且采用X射线单晶衍射分析方法测定了化合物4b的结构. 初步生物活性试验结果表明, 部分标题化合物具有一定的杀菌活性和促进黄瓜子叶生根活性.     

超支化聚硅(碳/氧)烷的研究进展

总结了近十年来超支化聚有机硅(碳/氧)烷的研究进展,其中着重综述了硅氢加成反应、亲核取代反应和脱氢反应在制备超支化聚硅(碳/氧)烷的过程中各种因素对反应过程及产物物化性能的影响。     

苯炔与硝酮[3+2]环加成制备二取代苯并异噁唑烷

采用[3 2]1,3-偶极环加成反应,苯炔前体邻-三甲硅基苯酚三氟甲磺酸酯在氟化铯的作用下与硝酮反应合成了9个2,3-二取代苯并[d]异噁唑烷,收率87%～97%。其结构经1H NMR,13C NMR和高分辨率MS确证。     

Synthesis and Primary Research on Antitumor Activity of Three New Panaxadiol Fatty Acid Esters

For making use of Ginseng resources that exhibit an antitumor activity and for finding new anticancer drugs,three new fatty acid ester compounds: 3β-acetoxy panaxadiol ( Ⅰ ), 3β-palmitic acid aceloxy panaxadiol ( Ⅱ ), and 3β-octadecanoic acid aceloxy panaxadiol( Ⅰ , Ⅱ , and Ⅲ ) were synthesized with panaxadiol, diacetyl oxide, palmityl chloride and stearyl chloride, and their structures were determined via MS, 13C NMR, IR, TLC, and so on. The molar yields of the three compounds are 75.14%, 79. 08%, and 72. 57%, respectively. Meanwhile, the antitumor activity of the three new panaxadiol fatty acid ester derivatives and panaxadiol was compared by using the method of MTT. Tumor cell used was Vero cell line. Positive control was 5-FU, blank was an RPMI1640 culture medium, negative control was an RPMI1640 culture medium and the solvent for drugs to be tested. Compound Ⅰ has the strongest antitumor activity followed by panaxadiol; compounds Ⅱ and Ⅲ have similar and weakest antitumor activities.Furthermore, the antitumor activities of the panaxadiol fatty acid ester derivatives show positive correlation with the concentration of the test group, but show no relationship with the molecular weight of fatty acid. The methods that are used to synthesize the three compounds with high yields and strong antitumor activities are simple and show a great potential for meeting the needs of industrial manufacture of these drugs.