乙酯

Hybrid mesoporous molecular sieve materials with hexagonal mesoporous structure and covalent bonded polyoxometalates were synthesized based on tetraethoxysilane anti lacunary polyoxometalate, SiW11, via sol-gel method in the presence of triblock copolymers P123 as the structure-directing agent. The influences of molar ratio of inorganic precursors and aging temperature on the structure and the loadings of SiW11 in the hybrid materials were investigated. Some reaction details in the synthesis were revealed.

用嵌段共聚物P123为模板剂，正硅酸乙酯和缺位结构的多金属氧酸盐SiW11为无机前驱体，由溶胶－凝胶法合成了具有六方结构和SiW11共价键联的介孔分子筛杂化材料SiW11/SBA-15，着重考察了无机前驱的配比和老化温度对杂化材料结构及SiW11负载量的影响。

The hybrid mesoporous materials, PW11/SBA-15, were synthesized using tetraethoxysilane and lacunary polyoxometalate Na7PW11O39 (PW11) by a co-condensation approach in the presence of triblock copolymer EO20PO70EO20 (P123) as a template.

采用三嵌段共聚物EO20PO20(P123)为模板剂，正硅酸乙酯和缺位Keggin型多金属氧酸盐Na7PW11O39(PW11)为无机前驱体，由共缩合法一步合成了PW11/SBA-15介孔杂化材料。

The twig of Lagerstroemia floribunda Jack were extracted with ethanol and isolated with silica gel column chromatography.

多花紫薇的枝经乙醇冷浸提取，依次用石油醚、乙酸乙酯和正丁醇萃取。

The stem barks of Lagerstroemia calyculata Kurz were extracted with methanol and isolated with silica gel column chromatography.

副萼紫薇的茎皮经甲醇冷浸提取，依次用石油醚、乙酸乙酯和正丁醇萃取。

Objective the chemical constituents of the ethyl acetate extract of Lagerstroemia reginae Roxb, Lagerstroemia calyculata Kurz and Lagerstroemia floribunda Jack were studied in this research.

目的：本研究对大叶紫薇、副萼紫薇和多花紫薇乙酸乙酯萃取部分的化学成分进行研究。

In Laurencia cartilaginea, nine compounds (compoundsl-9) have been isolated and identified from the extraction of EtOAc fraction.

从软骨凹顶藻Laurencia cartilaginea乙醇浸提液的乙酸乙酯部分分离得到8个单体化合物和一组甾醇混合物(化合物1—9)，并通过IR、~1H-NMR、~(13)C-NMR、EI-MS、GC-MS、FAB-MS、ESI等波谱技术进行鉴定。

Keywords ethyl linolenate;silver nitrate;adsorption column;supercritical fluid

亚麻酸乙酯；硝酸银；吸附柱；超临界流体

Models of K562 cells inducing differentiation to lineages of megakaryocyte, erythrocyte and macrophagocyte were established with inducers TPA (tetradecanoylphorbol 13-acetate), Hu and HMBA respectively.

用Western blot检测以十四烷酸佛波醇-13－乙酯(tetradecanoylphorbol 13-acetate， TPA)、羟基脲(hydooxyurea， Hu)及六甲基双乙酰胺(hexamethylene bisacetamide， HMBA)为诱导剂分别诱导K562细胞向巨核细胞系、红细胞系及巨噬细胞系分化时bcl-6表达变化，用PCR、克隆、直接DNA测序方法分析bcl-6基因5'调控区序列变异情况。

THE ADDITION REACTION OF ALKENES AND DIETHYL MALONATE

烯类与丙二酸二乙酯的加成反应

The reaction of [60] fullerene with dimethyl malonate and diethyl malonate in the presence of manganese acetate dihydrate for 20 min afforded singly bonded [60] fullerene dimers in a 1, 4-addition pattern.

Mn作为一类良好的自由基引发剂，能有效地催化C〓与丙二酸二甲酯和丙二酸二乙酯的自由基加成反应，生成C〓的二聚体。在回流的氯苯中随着时间的的延长，二聚体分解成1，4-双加成的C〓衍生物。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。