查询词典 ether

Take silica gel chromatography eluting with EtOAc / petroleum ether(1:9～5:5). The production was washed several times by MeOH, and dissolved in dimethyl formamide to recrystallize, we got yellow power crystal.

结果：(1)HPLC检测含量大于95％，符合对照品的要求；(2)理化鉴别实验均与文献吻合；(3)紫外、红外、质谱、核磁共振的光谱结果均与文献值一致，确定产物为金松双黄酮。

The insecticidal activities of the ethanol extracts and 5 kinds of extracts with petroleum ether, chloroform, ethyl acetate, n-butanol, aqueous from Rubia cordifolia L. against wolfberry aphis was investigated.

采用点滴法，测定了茜草乙醇提取物和石油醚、氯仿、乙酸乙酯、正丁醇和水5种不同极性萃取物对枸杞蚜虫的触杀活性。

Additionally, 75 volatile chemical constituents have been identified from the petroleum ether extracted part by capillary GC-MS, and the relative percentages of them are determined by GC method. The result showed that the volatile constituents of Musella lasiocarpa mainly includes advanced alkane, aliphatic acid and ester, aldehyde, ketone, aromatic and its heterocyclic compounds. With the compounds that have been isolated and identified from Musella lasiocarpa, the biogenensis pathway of new compound MT-3 is approached. Furthermore, the bacteriostasis of the 6 compounds to Escherichia coil, Pseudomonas aerusinosa, Bacillus megaterium, Sarcina lutea and Bacillus subtilic are determined by flat dilution method.

此外，从其石油醚萃取部分用毛细管色谱法分析鉴定出75种挥发性化学成分，并测定了各组分的相对百分含量，结果表明，地涌金莲挥发性化学成分以高级烷烃、高级脂肪酸酯及醛、酮、芳香和芳香杂环化合物为主；根据从地涌金莲中鉴出和分离得到的化合物，探讨了新结构化合物MT-3的生源代谢途径；采用平板稀释法测定了地涌金莲中六种化学成分对大肠杆菌、绿脓杆菌、巨大芽孢杆菌、藤黄八叠球菌和枯草芽孢杆菌的抑菌作用。

The results show that the resulting product can be separated by the mixture of petroleum ether, aether and acetic acid (10:10:1, V/V). Among them, the oleic acid component can be eluted by the mixed solvent of ethanol and carbon tetrachloride (35:15, V/V), and then productivity of sodium oleoyl sarcosine can be obtained.

结果表明：用石油醚：无水乙醚：冰乙酸＝10：10：1分离产物中的组分，再用无水乙醇：四氯化碳＝35：15混合溶剂洗脱制备油酸组分，进而计算油酰肌氨酸钠的产率是可行的。

The results showed that silver ion can complex with segregative carbon-carbon double bonds in DHA ester, with isolated C=C bonds in allyl ether and with conjugate C=C bonds in benzene individually.

研究结果表明，银离子可以与DHA乙酯的隔离碳—碳双键、烯丙醚的孤立碳—碳双键及苯的共轭碳—碳双键形成络合物。

Study on the Approach and the Medchine for the Deprotection of Silyl Ether by Sodium Periodate

过碘酸钠去硅醚保护基方法及机理的研究在线阅读整本下载分章下载分页下载

STUDY ON THE APPROACH AND THE MEDCHINE FOR THE DEPROTECTION OF SILYL ETHER BY SODIUM PERIODATE Abstract Silyl ethers are the most widely used hydroxyl protecting groups in organic synthesis.

第二部分：过碘酸钠去硅醚保护基方法及机理的研究硅醚保护基种类多，稳定性较好，且反应简单，作为羟基的保护基在有机合成中得到广泛应用。

Some useful fluorine-containing intermedi-ates were synthesized by the reaction of activated methylenecompounds or silyl enol ether with 2,2-dihydropolyfluoro-alkanoates or 2-hydropolyfluoroalk-2-enoates in the presenceof different bases.

进一步研究表明，在氢化钠的作用下，苯乙腈，苄基苯基甲酮也可以与2-氢多氟-2-烯酸乙酯发生亲核加成反应，苄基苯基甲酮的加成中间体经多聚磷酸环化，得到了间位氟烷基取代的α-萘酚衍生物。

The cis-decalin 79 was obtained from 2-methoxy-4-methylphenol (77) via a sequence of reactions involving intermolecular Diels-Alder reaction of masked o-benzoquinone derived from 77 and ethyl vinyl ketone, silyl enol ether formation and Cope rearrangement.

第一部份：以2-甲氧基-4-甲基酚(77)为起始物，经由二乙醯基亚碘苯氧化、分子间Diels-Alder反应、烯醇矽醚的形成及Cope重排反应得到具有十氢萘骨架化合物79。

The composite stabilizer of chlorinated paraffin was made from ethylene glycol diglycidyl ether, methyl stannic, triphenyl phosphate, exoxidized soybean oil. The influences of components in the composite stabilizer for thermal stability of chlorinated paraffin were investigated.

以乙二醇二缩水甘油醚和甲基锡为主稳定剂、亚磷酸三苯酯和环氧大豆油为助稳定剂制备了氯化石蜡复合稳定剂，研究了各组分配比对氯化石蜡热稳定性的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。