查询词典 coumarin

According to explore the extracting process of coumarin from melilotus, include extracting with ethanol, decoloring with petroleum ether and extracting with chloroform was determined.

通过对提取工艺进行探索后，确定了乙醇提取、石油醚脱色、氯仿萃取的工艺路线。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydride has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

The yield of coumarin could be reached up to 86.6% with lower consumption of acetic anhydride in case the total molar ratio of acetic anhydride to salicylaldehyde=1 9∶1 and the reaction was...

水杨醛与乙酸酐的总摩尔比为 1∶1.9，反应近终点时在( 2 14± 2 )℃保温反应 0 。5h，香豆素收率达 86.6%。

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydri de has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

摘 要 对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

The yield of coumarin could be reached up to 86.6% with lower consumption of acetic anhydride in case the total molar ratio of acetic anhydride to salicylaldehyde=1.9∶1 and the reaction was kept 0.5 h at 212～216 ℃ when the reaction was close to the end.

水杨醛与乙酸酐的总摩尔比为1∶1 。9，反应近终点时在(214±2)℃保温反应0.5 h，香豆素收率达86.6%。

Results:The leaves of Tatarian Dogwood contained amino acid,polysaccharides,reducing sugar,glycosides,cardiac glycosides,anthraquinones,flavonoids,tannin,volatile oils and chlorophyll.Protein,organic acid,coumarin and alkaloid failed to be detected.

结果：红瑞木叶含有氨基酸、多糖、还原糖、苷类、酚性物、蒽醌、黄酮、鞣质、挥发油、叶绿素等化学成分，未检测出蛋白质、有机酸、香豆素、生物碱、皂苷类成分。

The interaction between bovine serum albumin and such a natural pharmaceutical homologue as coumarin, umbelliferone and aesculetin was investigated using fluorescence spectroscopy and ultraviolet spectroscopy.

运用荧光光谱、紫外光谱法研究了三种香豆素中药小分子与牛血清白蛋白的相互作用。实验结果表明，香豆素类小分子能够插入BSA分子内部与BSA形成基态复合物导致BSA内源荧光猝灭，猝灭机理主要为静态猝灭和非辐射能量转移。

The left coumarin moiety was assembled by aldol condensation and then intramolecular esterification in one pot, which would be a popular method to build 3-substituted coumarins later.

最终，我们以12%的总产率和98.7%的ee值首次实现了-rutamarin的手性全合成；同时，我们还以17%的高产率实现了其消旋体的合成，比之以前文献报道的产率提高了2.5倍。

The company mainly produces cinnamaldehyde, cinnamic acid, cinnamic alcohol, cinnamic nitriles,-bromo-cinnamic aldehyde, amyl cinnamic aldehyde, acetic acid Gui ester, cinnamic acid acetate, L-carnitine, coumarin , vitamin B1 and so on, one of cinnamon products only amounted to more than 100 kinds of quality and technical content are up to domestic advanced level, is expected to reach an annual output value of 10 billion yuan.

公司主要生产肉桂醛、肉桂酸、肉桂醇、肉桂腈、α-溴代肉桂醛、戊基肉桂醛、乙酸桂酯、肉桂酸乙脂、左旋肉碱、香豆素、维生素B1等，其中仅肉桂系列产品就达100多种，其质量及技术含量均达到国内先进水平，预计年产值可达10亿元人民币。

The company mainly produces benzaldehyde, cinnamic aldehyde, cinnamic acid, cinnamic alcohol, cinnamic nitriles,-bromo-cinnamic aldehyde, amyl cinnamic aldehyde, acetic acid Gui ester, cinnamic acid acetate, L-carnitine, coumarin, vitamin B1, etc., of which only cinnamon series reached more than 100 kinds of products, its quality and technical content are up to domestic advanced level, is expected to reach an annual output value of 10 billion yuan.

公司主要生产苯甲醛、肉桂醛、肉桂酸、肉桂醇、肉桂腈、α-溴代肉桂醛、戊基肉桂醛、乙酸桂酯、肉桂酸乙脂、左旋肉碱、香豆素、维生素B1等，其中仅肉桂系列产品就达100多种，其质量及技术含量均达到国内先进水平，预计年产值可达10亿元人民币。

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