查询词典 sulfur ether

A quantitative size exclusion chromatcgraphic method was developed for studying the complexation reaction between a biscrown ether and potassium picrate in tetrahyrofurane.

用定量的体积排除色谱方法。研究了双冠醚和苦味酸钾在四氢呋喃中的配合反应。

The ammonia was evaporated under decreasing pressure, and the precipitate was filtered off and the liquid was poured into hot saturated picric acid solution to get picrate with a yield of 85.0%. The optimum process starting from imidazole-4,5-dicarboxylic acid was: imidazole-4,5-dicarboxylic acid in acetic anhydride was refluxed to get imidazole-4-carboxylic acid, and the product was esterification in ethanol with a catalyzer of concentrated sulfuric acid to get ethyl imidazole-4-carboxylate, at last the compound above was reduced by LiAlH4 in ether at room temperature to get the target compound, the total yield of this route was 49.6%.

以4，5-二羧酸咪唑为原料的较佳工艺：1 脱羧反应：4，5-二羧酸咪唑40g，醋酐1200ml，回流10h，过滤并将滤液浓缩至干，所得固体加至50%的乙醇溶液回流，过滤并将滤液自然冷却过夜，过滤得固体；2 酯化反应：4(5)-羧酸咪唑50g，乙醇1000ml和浓硫酸60ml，加热回流2h，5%浓度NaOH溶液调节至pH＝8，减压浓缩至干，加入少量水回流，自然冷却过夜并过滤得固体；3 还原反应：LiAlH410g，乙醚300ml和4(5)-羧酸咪唑乙酯28g，常温反应1.5h，小心滴加25ml水后过滤，滤渣溶于300ml甲醇中并过滤，收集所得乙醚和甲醇滤液浓缩至干，将所得固体溶于300ml乙醇中加热回流，后将溶液浓缩至约30ml，冷却并过滤得固体，该路线总收率为49.6%。

The other for: safrole, sassafras oil, safrole different 82 yuan / kg; 1 - phenyl -2 - propanone 2,500 yuan / kg; 3.4 dioxane methylene diphenyl -2 - propanone 7200 yuan / ton; Piperonal 1,000 yuan / kg; N-acetyl-o-amino benzoic acid 11500 yuan / ton; anthranilic acid 15,500 yuan / ton; Phenylacetate 15,000 yuan / ton; acetic anhydride 9900 yuan / ton; trichloromethane 4100 yuan / ton ; anhydrous ether 8500 yuan / ton; piperidine 58000 yuan / ton; methyl ethyl ketone 10,000 won / ton; sulfate 1,200 yuan / ton; hydrochloride 400 yuan / ton; ethanol 4200 yuan / ton.

另供：黄樟素、黄樟油、异黄樟素82元/公斤；1-苯基-2-丙酮2500元/公斤；3.4 亚甲基二氧苯基-2-丙酮7200元/吨；胡椒醛1000元/公斤；N-乙酰邻氨基苯酸11500元/吨；邻氨基苯甲酸15500元/吨；苯乙酸15000元/吨；醋酸酐9900元/吨；三氯甲烷4100元/吨；无水乙醚8500元/吨；哌啶58000元/吨；甲基乙基酮10000元/吨；硫酸1200元/吨；盐酸400元/吨；无水乙醇4200元/吨。

The other for: safrole, sassafras oil, safrole different 82 yuan / kg; 1 - phenyl -2 - propanone 2,500 yuan / kg; 3.4 dioxane methylene diphenyl -2 - propanone 7200 yuan / ton; Piperonal 1,000 yuan / kg; N-acetyl-o-amino benzoic acid 11500 yuan / ton; anthranilic acid 15,500 yuan / ton; Phenylacetate 15,000 yuan / ton; acetic anhydride 9900 yuan / ton; trichloromethane 4100 yuan / ton ; anhydrous ether 8500 yuan / ton; piperidine 58000 yuan / ton; toluene 5200 yuan / ton; methyl ethyl ketone 10,000 won / ton; sulfate 1,200 yuan / ton; hydrochloride 400 yuan / ton; anhydrous Ethanol 4200 yuan / ton.

另供：黄樟素、黄樟油、异黄樟素82元/公斤；1-苯基-2-丙酮2500元/公斤；3.4 亚甲基二氧苯基-2-丙酮7200元/吨；胡椒醛1000元/公斤；N-乙酰邻氨基苯酸11500元/吨；邻氨基苯甲酸15500元/吨；苯乙酸15000元/吨；醋酸酐9900元/吨；三氯甲烷4100元/吨；无水乙醚8500元/吨；哌啶58000元/吨；甲苯5200元/吨；甲基乙基酮10000元/吨；硫酸1200元/吨；盐酸400元/吨；无水乙醇4200元/吨。

Methods The activitie of anti-lipidperoxidation of Chinemys Plastrum Testudinis of petroleum-ether, acetoacetate and 95% alcohol solution from two producing areas was studied by DPPH.

方法采用DPPH法分别测定两种不同产地龟板的石油醚、乙酸乙酯、95％乙醇等不同极性溶剂提取物的抗氧化活性。

Ointment extracted from Plastrum Testudinis was separated by silica gel column chromatography, gradiently eluted by petroleum ether-ethyl acetate, and 16 (Ts-1～Ts-16) components were obtained, which were biologically evaluated by MTT assay and flow cytometry on the proliferation of rat marrow-derived mesenchymal stem cells. Results showed that Ts-12 induced proliferation compared with the control group ( p ＜0.05), while Ts-4 showed inhibitive effect. Other groups showed no significance ( p ＞0.05). GC-MS was used to analyze the chemical components in different groups.

中药龟板提取物浸膏经硅胶柱层析，用石油醚-乙酸乙酯作洗脱剂，梯度洗脱，得到16个组分；采用MTT法和流式细胞技术研究了它们对鼠骨髓间充质干细胞的增殖作用，实验结果显示组分Ts-12具有促进rMSCs增殖的作用( p ＜0.05)，而组分Ts-4则表现出抑制rMSCs增殖的作用( p ＜0.05)，其它样品对rMSCs的增殖作用不显著( p ＞0.05)，不具统计学意义。

" Cypress together benefit the 斯 tooks a look cup carefully, having already tooked a look an oneself's hand to say with smile, I know why:"Ising the top of the my hand is these platinum black powder reasons, these powders make the alcohol in the grape wine(note:The scientific term is called ether)have chemical reaction with the oxygen in the air, born the cause of acetic acid.

" 柏齐利阿斯仔细的看了看杯子，有看了看自己的手笑着说，我知道为什么了："是我手上这些铂黑粉末原因，这些粉末使红葡萄酒里的酒精与空气中的氧气起了化学反应，生成了醋酸的缘故。

The antineoplastic effective parts of Plumbago zeylanica L.were chloroform and petroleum ether extracts.

白花丹氯仿提取部位、石油醚提取部位体外抗肿瘤作用较好，值得对其提取部位进一步分离纯化并研究其抗肿瘤作用机制。

Polyoxymethylene, polycarbonate, modified polyphenylene ether, the polyester and other five in number, and special addition to the above five kinds of engineering plastics often refers to other superior performance of engineering plastics.

聚甲醛，聚碳酸酯，改性聚苯醚(PPO，也有缩写为PPE的)，聚酯等五种，而特殊工程塑料常指除以上五种以外的性能更优异的工程塑料。

But this ether may not be thought of as endowed with the quality characteristic of ponderable media, as consisting of parts which may be tracked through time.

但这以太可能不被认为是天赋的品质特性ponderable媒体作为组成部分，它可以通过追踪时间。

The Porsche Owner: But it's my car!

可，这是我的车呀。

LOX_83}{Oh, another bunch of wackos.

{LOX_83}{呃，又一群怪人。