查询词典 methyl

When used in combination with methyl salicylate, menthol enhances the penetration of the methyl salicylate.

当与水杨酸甲酯结合使用时，薄荷醇可增强水杨酸甲酯的渗透性。

This article uses the tetramethyl ammonium hydroxide∕methyl iodide for methyl esterification and the method of temperature program ,determine the content of lactic acid, ethanoic acid, propionic acid, butyric acid.

使用四甲基氢氧化铵/碘甲烷对青贮料浸出液进行甲酯化反应，采用程序升温的方法，同时测定青贮料中乳酸、乙酸、丙酸、丁酸的含量。

A compound of formula wherein R1 is hydrogen, halo or methoxy; R2 is hydrogen, halo, methyl, ethyl or methoxy; R3 is carboxy, tetrazolyl, or -CONHSO2R where R is methyl, ethyl, phenyl, 2,5-dimethylisoxazolyl or trifluoromethyl; T is -CH2- or -SO2-; and ring A is 3-chlorophenyl, 4-chlorophenyl, 3-trifluoromethylphenyl, 3,4-dichlorophenyl, 3,4-difluorophenyl, 3-fluoro-4-chlorophenyl, 3-chloro-4-fluorophenyl or 2,3-dichloropyrid-5-yl; or a pharmaceutically acceptable salt or prodrug thereof, as well as pharmaceutical compositions containing them are described and claimed.

本发明涉及一种式化合物，其中R 1 是氢原子、卤素或甲氧基；R 2 是氢原子、卤素、甲基、乙基或甲氧基；R 3 是羧基、四唑基或－CONHSO 2 R 4 ，其中R 4 是甲基、乙基、苯基、2，5－二甲基异∴唑基或三氟甲基；T是－CH 2 －或－SO 2 －；环A是3－氯苯基、4－氯苯基、3－三氟甲基苯基、3，4－二氯苯基、3，4－二氟苯基、3－氟－4－氯苯基、3－氯－4－氟苯基或2，3－二氯吡啶－5－基；或其药用允许的盐或前药，还包括所阐述和要求权利的含有它们的药用组合物。

A direct method to prepare nanometre catalyst of positive electrode for methyl alcohol fuel battery is to add strong oxidant to a mixed solution of manganese nitrate and some other metal nitrate, to coat them on the graphite electrode to have catalyst precursor produced, then to prepare the non-platinum nanometre catalyst of metal ion-doped manganese dioxide with carbon as a carrier by thermolytic reaction of the in-situ precursor. The prepared catalyst has the advantages of high electrical catalytic activity of methyl alcohol, high performance to protect against CO poison and low price, and it can lower the battery manufacturing cost effectively as well as can raise the entire electrical property of the battery so that the price performance and the market competitive edge of the battery are enchnaced effectively.

一种直接甲醇燃料电池阳极纳米催化剂的制备方法是在硝酸锰和其它金属硝酸盐的混合溶液中加入强氧化剂，涂抹于石墨电极上制成催化剂先驱体，通过先驱体在原位的热分解反应来制备以碳为载体的金属离子掺杂二氧化锰非铂纳米催化剂；制得的催化剂具有高的甲醇电催化活性、高的抗CO毒化性能以及低廉的价格等优点，可以有效地降低电池的制造成本，提高电池的整体电性能，从而有效地提高直接甲醇燃料电池的性能价格比及市场竞争能力。

In order to get the aryl alkynyl thio ether, we need to synthesize some important terminal functional compounds. Based on the preceding reaearch of our laboratory, we selected methyl thio methyl phenyl sulfone as nucleophilic reagent to eract with aromatic aldehyde and synthesized successfully a series of methylthio aryl ethynes I_ by"one-pot"reaction .

本论文在大量的文献调研和本实验室过去研究结果的基础上，利用亲核硫试剂甲硫基甲基苯基砜(methylthiomethyl phenyl sulfone， MP-S)与芳香醛的&一锅反应&，成功的合成了一系列甲硫芳炔化合物I_，从而为实现形态各异的芳炔硫醚类分子提供了一个良好的构筑平台。

A series of lanthanide complexes (Ln = Er, Nd, Yb) with infrared emission properties were designed and synthesized by using different anionic ligands [1 -phenyl-3-methyl-4-(4-tertbutylbenzoyl)-5-pyrazolone and l-phenyl-3-methyl-4--5-pyrazolone and 2-naphtoyl trifluoroacetone] and netural ligands (2,2-dipyridine, phenanthroline, triphenylphosphine oxide and water). Three crystal structures of these complexes were obtained and structure studied, and the properties of photoluminescence and fluorescent lifetime were studied in detail.

我们通过选用不同的第一配体[1-苯基-3-甲基-4-(4-异丁酰基)-5-吡唑酮，1-苯基-3-甲基-4-(4-叔丁基苯甲酰基)-5-吡唑酮和2-萘基三氟乙酰丙酮]和第二配体(2，2-联吡啶，邻菲啰啉，三苯基氧膦)合成了16个稀土红外配合物(Ln=Er，Nd，Yb)，获得了其中三个配合物的单晶结构，研究了这些稀土红外配合物的光致发光和荧光寿命等性质。

R-4-Methyl-δ-valerolactone was transformed into-methyl 5-bromo-4-methylpentanoate (5) which is a stable and easily reserved reagent.

首次利用甾体皂甙元氧化降解废弃物-4-甲基－δ-戊内酯合成了松叶蜂性信息素(25，3S，7S)-3，7-二甲基－2-十五醇乙酸酯(2)和丙酸酯(3)。

Objective To modify the synthesis of Benzhydryl 2α- methyl - 2β- [ ( 1,2,3 -triazol - 1 - yl)- methyl ] penicillanate - 1,1 - dioxide, the key intermediate of β- lactamase in-hibitor tazobactam.

目的 改进β-内酰胺酶抑制剂泰唑巴坦关键中间体2α-甲基-2β[(1，2，3-三唑-1-基)-甲基]青霉烷酸砜二苯甲酯的合成。

Comparing with marine oils in the adjacent areas, all crude oils in Hade 4 oil field (except for HD401 well) have following peculiarity: very similar in the composition of light hydrocarbon fraction, and the distribution of of phytane-series isoprenoid alkanes, high concentration in steranes, terpanes and their aromatized compounds, as well as rearranged steranes; low concentration of gammacerane, 24-norcholestanes and 24-rearranged steranes, and low C〓 regular steranes C〓/(C〓+C〓+C〓＜20%; 3-methyl steranes and 27-norcholestane predominated, respectively; very low concentration of dinosterane and 4-methyl steroid.

分析表明，与相邻地区海相原油比较，除最南端的HD401井原油外，其它井区原油均具有下述特点：轻烃馏分组成十分接近、植烷系列类异戊烯烷烃分布较为一致、甾萜类和芳香甾萜类环状化合物浓度较高、重排甾烷丰度较高、伽马蜡烷含量低、规则甾烷组成中C〓丰度低C〓/(C〓+C〓+C〓＜20％、甲基甾烷中以3-甲基甾烷为主、甲藻甾烷和4-甲基甾烷丰度极低、降胆甾烷中以27-降胆甾烷为主、24-降胆甾烷和24-重排降胆甾烷丰度低。

The first step was esterifying FFA to its methyl esters. The second step was transesterifying the triglycerides in the products of the first step to methyl esters and glycerol.

第一步为酸催化预酯化反应，主要是将地沟油中的游离脂肪酸转化为脂肪酸甲酯；第二步为酸催化转酯化反应，主要是进一步将地沟油中的甘三酯转化为甲酯和甘油。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。