二羧酸

Yields from chiral bisoxazolines (5a) with diethyl oxalate using NaOCH〓 as base for the first time. The structures of chiral multioxazolines and their intermediates, multi (β-hydroxylamide) s, were characterized by 〓H NMR, IR, mass spectra and elemental analysis. The catalytic activities and enantioselectivities of chiral multi (β-hydroxylamide) s (4) and chiral multioxazolines (5～8) were investigated by using acetophenone and β-acetonaphthone as former chiral ketone, KBH〓 or NaBH〓 as reductive reagent in chapter three.

在此基础上，对合成方法作了创新，以羧酸或酯为原料，在无催化剂的条件下与手性α-氨基醇反应，通过回流分水或脱醇的方法，一步反应合成了手性多噁唑啉（5～8），产率为89.2%～98.4%；以手性双噁唑啉（5a）为原料，在NaOCH〓的作用下，与草酸二乙酯反应，首次合成了呋喃类双嗯唑啉（6a），产率为72.9%～75.6%。

The catalytic system composed of NHPI and transition metal ion can catalyze effectively ethane into acetic acid,cyclane into dicarboxylic acid,toluene into benzoic acid,alkene into epoxide,alkyne into acetylenic ketone,and amide into imide;NHPI used alone can catalyze adamantane to be carbonylated,hydrogen peroxide prepared by oxidization alcohol;NHPI combined with as...

NHPI与过渡金属离子组成的催化体系能高效地催化乙烷氧化为乙酸、环烷烃氧化为二元羧酸、甲苯氧化为苯甲酸、烯烃氧化为环氧化物、炔烃氧化为炔酮、酰胺氧化为酰亚胺；NHPI单独使用能催化金刚烷发生氧化羰基化反应、催化氧化醇制取过氧化氢；NHPI与有机助催化剂如偶氮二异丁腈、溴化季铵盐、蒽醌和醇等也能催化分子氧氧化反应。

The most commonly used method for the covalent binding of biomolecules onto 1-D nanostructures is through the diimide-activated amidation of carboxylic acid terminated nanostructures.

最常用的方法是通过端羧酸基纳米结构的二酰亚胺活化氨基化合物来进行生物分子与1-D纳米结构的共价结合。

S-methyl benzo[l,2,3]thiadiazole-7-carbothioate as one of a new plant inducer has been widely studied rencently, and has been already used as pesticide in agriculture.

苯并[1，2，3]噻二唑-7-羧酸硫甲酯是一类新型的植物诱导剂，此类物质出现后受到了广泛的重视，在植物病害防治中取得了良好的效果。

The target compounds were obtained in high yield through Michael conjugative addition of amines to methyl acrylates, cyclocondensation of the obtained diadducts in the presence of sodium methoxide,and decarboxylation of the cyclocondensation products in acid.

以胺类化合物为原料，与丙烯酸甲酯经过两次Michael加成得到N，N 二丙酸甲酯类化合物，该化合物在甲醇钠存在下进行环合，在酸性条件下脱羧，高收率得到4 哌啶酮类化合物，从而证明了这是一条合成N 取代 4 哌啶酮类化合物的普遍方法。

The catalytic action of various kinds of functional coordination compound and metallomicelles which are made from the complex and micelle, as mimic hydrolase or peroxidase, have been studied respectively in catalyzing the carboxylic ester and phosphatic diester hydrolysis, and the phenolic derivant oxidation in this paper. Some novel results of academic significance have been obtained.

本文以不同类型的功能配合物及其与表面活性剂形成的金属胶束作为水解酶和过氧化物酶的模拟酶模型，分别研究它们对羧酸酯、磷酸二酯水解反应和酚类氧化反应的催化作用，取得了新的有学术意义的成果。

Succinic acid A dicarboxylic acid formed by fermentation of sugars.

琥珀酸：为糖酵解过程中产生的二羧基酸。

The present invention relates to a novel process for converting the intermediate in the synthesis of atorvastatin having the following formula or atorvastatin lactose into the non-crystalline atorvastatin calcium: wherein A denotes a common protection group or separate protection groups for the dihydroxy group and B denotes a carboxylic acid protection group.

本发明涉及一种将具有下式的阿托伐他汀合成中的中间体或阿托伐他汀乳糖转化为非结晶阿托伐他汀钙的新方法：其中A表示二羟基的共同保护基或单独保护基，而B表示羧酸保护基。

The features of molecular structure of aromatics, resins and asphaltenes were investigated by ruthenium-ion-catalyzed oxidation, where involatile acid products were methylated with excess diazomethaneether and volatile acids were esterified with phenacyl bromide.

利用钌离子催化氧化方法对大港减压渣油芳香分、胶质和庚烷沥青质进行了选择性降解，通过GC、GC-MS等分析手段对降解反应产物中一元正构脂肪酸、α，ω-二元正构脂肪酸和苯二～六元羧酸的含量和分布分别进行了定量分析。

A new method for the synthesis of 1 methyl 3 propyl pyrazol e 5 carboxlic acid from 2 pentanone and diethyl oxalate is reported.

以 2 -戊酮和草酸二乙酯为起始原料，经缩合、与甲基肼环合、水解等三个步骤合成了 1 -甲基-3-丙基吡唑-5 -羧酸。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新