烷类

The reaction products between disubstituted phosphinosilane and alkynes were those eliminating SiMe3 after addition rather than those via normal addition.

二取代膦基硅烷和炔类化合物之间的反应不是一般的加成产物，而是加成后SiMe3被H消去的产物。

In this thesis, standard fingerprint of daphne diterpene esters from the root extract was first established by HPLC-UV, which can be used for D. genkwa identification and quality control. The major peaks in the standard fingerprint were identified by LC-MS.Quantitative analysis methods of yuanhuacine and yuanhuadine were established herein.

本文建立了芫花根中瑞香烷型二萜原酸酯类组分HPLC-UV标准指纹图谱，对主要色谱峰用LC-MS进行了归属，并对其中主要成分建立了定量分析方法，为不同产地、采收季节和人工栽培等原料药材的质量控制提供了科学依据。

Daphne diterpene esters are principal activitive components of Daphne genkwa, which is an endemic traditional Chinese medicine. Yuanhuacine has potent inhibition against several cancer cell lines. Inhibition against DNA topoisomerase I is probably its anticancer mechanism.

芫花为中国特有的瑞香科植物，主要有效成分为植物中罕见的瑞香烷型二萜原酸酯类化合物，其中芫花酯甲对多种癌细胞系有较强的抑制活性，对DNA拓扑异构酶I的抑制作用是其抗癌的可能机理。

Taxus media ; taxane diterpene ; flavonoid ; chemical constituent ; structure identification

曼地亚红豆杉；紫杉烷二萜；黄酮类化合物；化学成分；结构鉴定

School of Pharmacy, China Pharmaceutical University, Nanjing 210009Abstract : ent-Abietane diterpene lactones are extracted from the plants of Euphorbia. Their elementary structures are four-ring diterpenes.

松香烷内酯是大戟属植物中提取的一种典型二萜类化合物，其基本结构为四环二萜，有多种药理活性，特别是有较强的抗肿瘤活性。

The synthesis of divinyl liquid crystalline monomer 4-undecenyloyloxybenzoyl-4'-allyloxybenzoyl-p-benzenediol bisate and network polymers was described. The chemical structures of the synthesized monomer and network polymers were confirmed by FT-IR spectrum.

以双烯类液晶单体4-十一烯酰氧基苯甲酸-4'-烯丙氧基苯甲酸对苯二酚双酯为交联剂，通过与聚矽氧烷接枝反应，合成了系列网络聚合物P1~P5。

In Granards' reactionof fluorinated β-ketophosphonium salts we found differentGranard reagents give different reaction mechanisms andPhMgBr realized the enolate reaction of fluorinatedβ-keto-phosphonium salts.

在研究含氟β-酮基鏻盐的β位亲核加成反应中，我们利用含氟α-烷氧基-β-酮基鏻盐与有机锂试剂的亲核加成反应一锅法高度立体选择性地合成了E式或Z式三氟甲基的烯醚类化合物。

This study is not generalizable to the public because it was done in men over the age of 65 years.

黄烷醇是一种有益于人体健康的黄酮类化合物，广泛存在于多种蔬菜、绿茶和红葡萄酒中。

The effect of hydrophobic additive on the seed precipitation from sodium aluminate solution was studied by adding fatty acid and heneicosane at different proportions.

研究了疏水性添加剂脂肪酸类阴离子表面活性剂与21-碳烷不同配比对铝酸钠溶液分解产生氢氧化铝和氧化铝的粒度、强度及分解率的影响，考察了产物Al3和Al2O3的强度和粒度之间的关系，探讨了添加剂影响铝酸钠溶液晶种分解的相关机理。

The effect of hydrophobic additive on the seed precipitation from sodium aluminate solution was studied by adding fatty acid and heneicosane at different proportions. The results show that when the mass fraction of fatty acid is in the range of 32%-49% and the additive concentration in sodium aluminate solution is 150×10-6 g/L, the rate of precipitation increases, but the particle size of Al3 and Al2O3 reduces.

摘 要：研究了疏水性添加剂脂肪酸类阴离子表面活性剂与21-碳烷不同配比对铝酸钠溶液分解产生氢氧化铝和氧化铝的粒度、强度及分解率的影响，考察了产物Al3和Al2O3的强度和粒度之间的关系，探讨了添加剂影响铝酸钠溶液晶种分解的相关机理。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。