甲基

Pentanediol dithiophene ester was synthesized by means of alcoholysis reaction using 2,4-Pentanediol and Aroly chloride as raw materials, and 1H NMR spectrum was characterized and it can not be explained.

以2，4-戊二醇和芳酰氯为原料，通过醇解反应合成了一种新的内给电子体化合物二(2-噻吩甲酸)-2，4-戊二醇酯，表征其1H-NMR谱，发现化学位移在2附近出现了三组亚甲基峰，无法解释。

This review mainly summarized the reaction mechanism and the method of methyl oxided into aldehyde group.

这一部分主要对甲基氧化生成醛基的反应机理、方法及化合物的用途进行综述。

The method of 4-methylimidazole synthesis using pyroracemic aldehyde was selected,and flow chart and operation process were studied.

本文对4-甲基咪唑常用的几种合成方法进行了介绍，对其工业化生产的优缺点进行了对比，最终选定了丙酮醛法，并给出了工艺流程图和操作步骤。

An aliquot of the reaction mixture was injected into a C18-column with a mobile phase consisting of 0.05 molL^(-1) phosphate buffer (pH 5.5)-methanol (65:35, V/V) and detected at 235 nm.

土壤样品用0.6 molL^(-1) KOH提取，经对甲基苯磺酰氯衍生化后，注入C18柱中分离，用紫外检测器在235 nm波长检测，流动相组成为0.05 molL^(-1)磷酸盐缓冲液(pH 5.5)：甲醇＝65：35。

CALORIMETRIC TITRATION FOR COORDINATION REACTION OF 2, 3-BENZO-8, 11, 15-TRIMETHYL-18-CROWN-6 WITH ALKALI AND ALKALINE EARTH METAL IONS

若干碱金属及碱土金属离子与2，3-苯并-8，11，15-三甲基-18-冠-6配位反应的量热滴定研究

Covalent modification of four isolated alkannin derivatives (alkannin, acetylalkannin,β,β dimethylacrylalkannin and β acetoxyisovalerylalkannin, respectively) on rabbit muscle latate dehydrogenase and yeast Alcohol Dehydrogenase has been studied.

为研究紫草萘醌类化合物的细胞毒性作用机制，从新疆软紫草根中分离出四种紫草萘醌类化合物β，β二甲基丙烯酰阿卡宁(1)，乙酰阿卡宁(2 )，β乙酰氧基异戊酰阿卡宁(3)和阿卡宁(4)。

In this dissertation, the stable radical cation salts ofphenothiazine and 10 - alkylphenothiazine alky=〓(〓 hexachloroantimonate,perchlorate and iodide were prepared by one- electron oxidationwith 2,2,6,6-tetramethyl - 4 -acetyloxypiperidine oxoammoniumhexachloroantimonate, perchloric acid/hydrogen peroxide andmolecular iodine respectively, and they were characteried by UV -Vis spectroscopy and ESR spectroscopy.

本文的主要内容有：吩噻嗪和10-烃基吩噻嗪分别被碘、高氯酸／过氧化氢，2，2，6，6-四甲基-4-乙酰氧基哌啶氧铵六氯锑酸盐氧化为相应的正离子自由基碘盐、高氯酸盐、六氯锑酸盐，并用UV-Vis光谱和ESR波谱进行了鉴定和研究。

This paper introduces the preparation and application of the sulfonated alkyl polyglycoside in drilling fluids.

介绍了磺甲基烷基糖苷的制备方法及其在钻井液中的应用。

When the number of methylene groups in alkylamine was larger than 16,the intercalation nanocomposites were obtained.

当烷基铵中的亚甲基数大于十六时，能够获得插层型的纳米复合材料。

A process for preparing alkylene glycols including reacting an alkylene oxide with water in the presence of a combination of additives and an anion exchange resin, wherein the combination of additives comprises carbon dioxide and an organic or inorganic base provided in an amount sufficient to maintain a pH of the reaction mixture between about 5.0 and 9.0, with the proviso that, when the base is bicarbonate or carbonate, then the anion exchange resin is a trimethyl benzyl ammonium anion exchange resin.

制备亚烷基二醇的方法，包括让烯化氧与水在添加剂组合和阴离子交换树脂存在下进行反应，其中添加剂组合包括二氧化碳和以足以保持反应混合物的pH值在约5.0和9.0之间的量提供的有机或无机碱，前提条件是当碱是碳酸氢盐或碳酸盐时，阴离子交换树脂是三甲基苄基铵阴离子交换树脂。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。