二酸的

In addition, two water-solublephosphonic acid derivatives of C〓 and two diadducts of phosphonate derivative of C〓were also prepared. All the four compounds can be dissolved in DMSO, which is asolvent easy to be soluble in water. Their DMSO aqueous solution could haveprospective applications in the field of biomedicine.

研究了富勒烯膦酸酯衍生物的水解反应，首次合成了两个水溶性富勒烯膦酸衍生物，另外还合成了两个二加成的富勒烯膦酸酯衍生物，这四个衍生物均能很好地溶解在和水互溶的DMSO中，它们的DMSO水溶液可能在生物医学研究中可能会有很好的应用价值。

Propargyl alcohol was protected by dihydrophran with the catalysis of PPTS ,and then reacted with Ethyl Mag bromide to prepare its corresponding Grignard reagent.

炔丙醇在 PPTS 催化下由二氢吡喃保护，与溴乙烷格氏试剂反应生成相应的格氏试剂，然后与氯甲酸甲酯反应得到羟基丁炔酸甲酯四氢吡喃醚，在 PPTS 催化下脱保护后进行甲磺酰化，由溴化钠进行溴取代后合成了4-溴-2-丁炔酸甲酯，总收率达53%。

The functional relationship between the content of pyruvic acid and three factors,including maltose,glucose and tryptone,was fit using multi-power regression function method.

采用响应面法对丙酮酸发酵培养基成分葡萄糖、硫酸铵、蛋白胨进行优化，采用多元二次回归方程拟合3种因素与丙酮酸含量间的函数关系，并得到了最佳条件。

GC/MS the law separates separately using the gas chromatography - mass spectrum, analyzes in the yellow croaker fish flesh to include the massive unsaturated fatty acid, confirmed the chemical composition, is mainly the vaccenic acid, the octadecenic acid and so on

利用气相色谱-质谱法分别分离，分析出黄花鱼鱼肉中含有大量的不饱和脂肪酸，确认出种化学成分，主要是十八碳二烯酸、十八碳烯酸等

Comb-shaped copolymer of polycarboxylate containing carboxyl,sulfonic groups(-SO3M),polyethylene glycol(-OC2H4-) was synthesized by monomers of sodium 2-acrylamido-2-methylpropane sulphonate,acrylic acid,polyethylene glycol monoester acrylate under certain conditions.

本文通过2-丙烯酰胺-2甲基丙基磺酸钠与丙烯酸、聚乙二醇单丙烯酸酯在一定条件下发生聚合反应合成含有羧基、磺酸基(—SO3M)、聚氧乙烯链(—OC2H4—)等侧链的高性能减水剂PC。

The cathode is generally one of three materials: a layered oxide, such as lithium cobalt oxide, one based on a polyanion, such as lithium iron phosphate, or a spinel, such as lithium manganese oxide, although materials such as TiS2 were originally used.

阴极通常是以下三类材料：一种层氧化物，例如钴酸锂、一种阴离子聚合物，例如磷酸锂铁，或者是一种尖晶石，例如锰酸锂，象例如二硫化钛之类材料曾经是最初使用的材料。

In the body and animals, dimethyl sulfone is one of the main sources of sulfur that is in the synthesis of methionine, cysteine , sulfur-containing tissue, protein and peptide.

二甲基砜是人体、动物等合成蛋氨酸、胱氨酸和含硫肽、蛋白，以及含硫组织中硫的主要供应源之一。

Disclosed is a method to prepare 3, 3-dimethyl butyric acid chloride, relating to an organically synthesized intermediated compound and particularly relating to a method to prepare 3, 3-dimethyl butyric acid chloride from 3,3-dimethyl butyric acid and phosphorus trichloride.

3，3-二甲基丁酰氯的制备方法，涉及一种有机合成中间体，尤其是涉及一种由3，3-二甲基丁酸与三氯化磷反应制备3，3-二甲基丁酰氯的方法。

ABSTRACT: In the presence of sodium t-butoxide and DMSO,ethyl 2-oxocyclopentanecarboxylate was subjected to C-alkylation with 2-(4-bromomethylphenyl)propanoic acid with high regioselectivity to give 2-［4-(1-ethoxycarbonyl-2-oxo-1-cyclopentanylmethyl)phenyl］propanoic acid (4) which was followed by hydrolysis,decarboxylation and salt formation to afford loxoprofen sodium in about 72% overall yield.

在叔丁醇钠和二甲基亚砜的存在下，2-丙酸对2-乙氧羰基环戊酮进行C-烷基化，再经水解脱羧，成盐即得洛索洛芬钠，以2-丙酸计算，总收率为72%。

On the basis of spectral data and chemical evidence, they were identified as apigenin, scutellarein, hypolaetin , daucosterol, martynoside, 8 acetylharpagide, harpagide, scutellarein 7 glucoside, luteolin 7 glucoside, triacontanoic acid, n hexacosanoic acid,β sitosterol , respectively.

从蒙古莸全草的甲醇提取物中分得 12个化合物，经波谱分析和理化常数测定确定其结构为洋芹素，4′-羟黄芩素，海波拉亭，胡萝卜甙，角胡麻甙，8- acetyl-harpagide，harpagide，4′-羟黄芩素- 7-葡萄糖甙，木犀草素- 7-葡萄糖甙，三十烷酸，二十六烷酸和β-谷甾

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。