合成

Therefore, studies on the synthesis and the applications ofα-alkenoyl ketene dithioacetals should be a valuable research project.

因此，α-烯酰基二硫缩烯酮的合成及其在合成中的应用研究是一重要的研究课题。

Therefore it is very important to explore the feadibility of clean synthesis lf complex compounds from a-oxo ketene dithioacetals

因此，以a-羰基二硫缩烯酮类化合物为合成子，探索复杂化合物的绿色合成方法将具有重要意义

Oxo ketene dithioacetals are a kind of versatile intermediates in organicsynthesis. It can be widely used in forming aromatic and heterocyclic compounds.

α-羰基二硫缩烯酮类化合物是一类重要的有机合成中间体，广泛应用于芳环和杂环化合物的合成中。

In the end, a Novel and facile method has been used to synthesize functionalized cyclopentadienes by Nazarov cyclization ofα-alkenoyl ketene dithioacetals under Vilsmeier conditions.

从合成的α-烯酰基二硫缩烯酮类化合物出发，经过Vilsmeier试剂作用下的Nazarov环合反应，合成了官能化环戊二烯类化合物。

Thus,Route 1 was not able to continue.In Route 2,the methyl groups of 6 could be developed from cyanos by different pathways individually(Scheme 5).In this thesis,we have completed the protection of one ketone group of 11,and further synthesis is currently under investigation.

在类似物的合成研究过程中，我们还取得了如下成果：(1)通过对中间体8的合成，发展了一种四氧化三铅现场氧化酚成醌，并进一步催化醌参与(来源：Af6BC论文网www.abclunwen.com)的Diels-Alder反应一锅化的方法。

As one of the most urgently needed medical intermediates, D-p-hydroxyphenylglycine is used mainly to produce β-lactam antibiotics.

D-对羟基苯甘氨酸主要用于合成β-内酰胺类半合成抗生素，是国内最紧缺的医药中间体之一。

Modern medicine considers to confirm, placenta has active synthetic hormone and enzymatic function, its complex hormone basically has chorion to close to sexual gland hormone, placenta gives birth to lacteal element and estrogen and progestational hormone.

现代医学研究证实，胎盘具有活跃的合成激素和酶的功能，其合成的激素主要有绒毛膜促性腺激素、胎盘生乳素以及雌激素和孕激素。

Theoretical studies on synthetic process of lactide were carried out with density functional theory and the geometries of compounds maybe to appear in reactive system were optimized.

采用密度泛函方法研究了丙交酯的合成过程，优化了合成过程中可能出现的化合物的几何构型，分析了各化合物的振动频率和偶极矩。

It was demonstrated that the reason of spiramycin production increased creased by vitamins was the promotion of synthesis of precursors and the formation of lactone.

由此表明维生素的添加促进螺旋霉素发酵合成可能是因为维生素促进了过程中前体物质的合成，从而增进了内酯环的形成。

Methods: Separate and abstract the effective components of Huangqi (Omni-Saponin、total-flavone) and Danshen (Danshen-ketone、 Danshen-Quinone). Applying L-Arginine methyl ester to pregnant rats by I. P to make Nitrogen Oxide Synthesis blocking models (uterus-placenta-fetus lacking blood and oxygen model or pregnant hypertension syndrome model). On day 12, 18 of pregnancy paunched the rats and took out the fetus and placenta/uterus. Measured the basal BP during pregnant period and BP、protein、basal activity each day. Observed placenta/deciduas ultramicroscopic structure by electron microscope and took count of languishment cells. Measured the expressive intensity of bcl-2、Bax of placental nutrient cells by SABC method.

一氧化氮合成酶阻滞剂L-精氨酸甲酯妊娠大鼠腹腔给药，制作一氧化氮合成阻滞模型（子宫-胎盘-胎儿缺血缺氧或妊娠高血压模型），妊娠第12、18天剖腹取胎、胎盘／子宫，妊娠期测基础血压，每日测血压、蛋白质量、基本生理活动；电镜观察胎盘／蜕膜超微形态结构，并进行细胞凋亡计数；免疫组化检测胎盘滋养细胞bcl-2、Bax表达强度；原位杂交法检测胎盘滋养细胞、血管内皮细胞VEGF、eNOS、iNOS、MCP-1、MMP9（基质金属蛋白酶9）mRNA表达。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失