乙酸乙酯

Chemiluminescent immunoassay is one of the advanced immunoassay ofnon-radioisotopic immunoassay because of its high sensitivity, wide dynamic range,high accuracy, stable labeled protein, full automation and extensive application field.CLIA using acridinium ester derivatives as chemiluminescent label has advantages oflow background, high signal-to-noise ratio, no need of catalyst and simpleluminescence system. Different aspects associating the DMAE·NHS-based CLIA were studied in thisthesis, including synthesis of acridinium ester, chemiluminescentcharacteristics of DMAE·NHS, labelling antibody or streptavidin with DMAE·NHS,two-site sandwich chemiluminescent immunoassay for TSH, two-sitesandwich chemiluminescent immunoassay involved biotin-streptavidinsystem for TSH, and competitive chemiluminescent immunoassay usingbiotin-streptavidin system for TT〓. The desired acridinium ester, DMAE·NHS, was synthesized according to thereference method with some modifications. The products were identified by IR, NMR,MS and elemental analysis. In our method, KOH was used in place of NaOH tosynthesize benzyl ester of 3,5-dimethyl-4-hydroxybenzoic acid,2',6'-dimethyl-4'-(n-succinimidyloxycarbonyl) phenyl-acridinium-9-carboxylate waspurified on a silica gel column with chloroform/ethylacetate(4:1, v/v) as eluent andfurther purified by triturating with hexane/acetone(2:1, v/v).

DMAE·NHS的合成是本论文的关键和难点，我们对文献方法进行改进：文献方法用氢氧化钠与3，5-二甲基-4-羟基苯甲酸反应制得3，5-二甲基-4-羟基苯甲酸钠，再用3，5-二甲基-4-羟基苯甲酸钠与苄氯作用制备3，5-二甲基-4-羟基苯甲酸苄酯，我们用氢氧化钾代替氢氧化钠，使合成取得成功；在合成2'，6'-二甲基-4'-苯基-吖啶-9-甲酸酯时，文献方法对粗产品进行两次硅胶柱层析纯化，第一次柱层析用氯仿／乙酸乙酯(4∶1，V∶V)作溶剂和淋洗剂，第二次柱层析用己烷／丙酮(2∶1，V∶V)作溶剂和淋洗剂，按照文献方法得到的不是所需要的化合物，我们只进行第一次柱层析纯化，然后用己烷／丙酮(2∶1，V∶V)进行研磨，过滤，洗涤，除去溶于己烷／丙酮(2∶1，V∶V)的部分，得到所需要的产品。

Seven compounds have been isolated from hard coral Acropora pulchra. These compounds are:pentadecoic acid, heptadecyl ester;(2)n-cetanol;(3)batyl alcohol;(4) N- [ 1 --2-hydroxyl--3,7-heptad-ecadienal] -hexadecanamide;(5)1 -0-hexanoyl-glycerol ester;(6)thymine;(7)uracil. Their structures were determined by IR, MS, HNMR, 13CNMR analysis.

从北海佳丽鹿角珊瑚Acropora pulchra乙醇提取液的乙酸乙酯部分分离出七个化合物，经IR、MS、~1HNMR、~(13)CNMR等波谱方法鉴定，其结构分别为：(1)十五酸十七酯，(2)正十六碳醇，(3)鲨肝醇，(4)N-1-羟基甲基-2-羟基—-3，7-十七碳二烯基十六酸酰胺，(5)1-正十六酸甘油酯，(6)胸腺嘧啶，(7)尿嘧啶。

From Cacalia deltophylla (collected from Luqu County, Gansu Province), 22 compounds were isolated, of which 15 compounds have been identified. Among them, two compounds are new. They are named as 3-methyl-4-hydro-8-acetyl-furanonaphth-9-one and 1hydroxy-2-methoxy-3-acetyl-4, 8-dimethyl-5, 8-dihydro-naphthalene.

从采自甘肃省碌曲县的三角叶蟹甲草全草的甲醇提取物的石油醚部分和乙酸乙酯部分中，采用同样方法分离得到22个化合物，鉴定了其中的15个化合物，其中有2个为新化合物，分别命名为3-甲基-4-氢-8-乙酰基-呋喃萘-9-酮（2）和1-羟基-2-甲氧基-3-乙酰基-4，8-二甲基-5，8-二氢-萘（3）。

By the polycondensation of amino acid 5-fluorouracil -1, 3-dipropyl esters with bis (2-chloroethyl) phos- phoramidic dichloride in the presence of 〓 or in vacuo, ten new polymers containing 5- fluorouracil, nitrogen mustard and amino acid were synthesized.

将1，3-双-5-氟尿嘧啶与二氯膦甲酸乙酯或二氯膦乙酸乙酯在DMF中反应制备得到20个三元共聚物，体外抗肿瘤试验表明：含有甘氨酸、缬氨酸、苯丙氨酸和酪氨酸的聚合加显示了一定的选择性，并且分析讨论了生物活性与结构之间的关系。

Methods Triethyl phosphite and ethyl chloroacetate were used as starting materials to synthesize pregabalin by Arbuzov reaction, Wittig-Horner reaction, Michael addition, reduction and resolution.

以亚磷酸三乙酯和氯乙酸乙酯为起始原料，经Arbuzov反应、Wittig-Horner反应、Michael加成、还原、拆分5步反应得到普瑞巴林。

The costuslactone and dehydrocostuslactone in the supercritical CO 2 extract of aucklandia were identified by TLC using a mobile phase of petroleum ether,ethyl acetate and benzene (70∶5∶15) and the colour developing reagent of 5% vanillic aldehyde dissovled in sulfuric acid.

用薄层色谱法，以ψ(石油醚∶乙酸乙酯∶苯)=70∶5∶1 5为展开剂，质量分数为 5 %香草醛硫酸为显色剂对木香超临界萃取物中的木香烃内酯与去氢木香内酯进行鉴别；并建立高效液相色谱法同时测定木香烃内酯与去氢木香内酯的含量方法。

For Method Ⅰ, the residues were extracted from homogenized tissue with acetone-ethylacetate-n-hexane (1∶1∶1, v/v/v), and then were redissolved in acetonitrile; for Method Ⅱ, the residues were extracted from homogenized tissue with acetonitrile-water under ultrasonication, and then were separated by liquid-liquid partition.

在样品前处理方法Ⅰ中，样品经丙酮-乙酸乙酯-正己烷(体积比为1∶1∶1)混合溶剂提取，乙腈转溶；在样品前处理方法Ⅱ中，样品用乙腈-水溶液均质，超声波辅助提取，液-液分配。

The similar nicotinoyltrifluoroacetones are synthesized from acetylpyridine and ethyl trifluoroacetate through Claisen reaction.The influnences of alcoholic natrium,reaction temperature and solvent on reaction yield is studied.The subliming method is improved.

本文以乙酰吡啶和三氟乙酸乙酯为主要原料，利用克莱森酯缩合反应，合成了三种相似结构的吡啶甲酰三氟丙酮化合物，考察了碱性试剂醇钠、反应温度和溶剂等因素对反应产率的影响，改进了纯化产物的方法。

L-Phenylalanine was then obtained by alkylation of N- glycine ethyl ester with benzyl bromide in the presence of an asymmetric phase-transfer catalyst-N-benzyl-cinchonine chloride, followed by hydrolysis of the resulting product.

以甘氨酸乙酯盐酸盐和二苯甲酮为起始原料合成了N-二苯亚甲氨基乙酸乙酯，后者在手性相转移催化剂-N-苄基氯化辛可宁诱导下与烷基化试剂溴化苄发生不对称相转移催化烷基化反应，水解得到L-苯丙氨酸。

Methyl-l, 3-oxazine-2,4-dione are prepared from ethyl acetoacetate and ethyl carbamate at 140 for 6h, catalysted by zinc acetate, giving to 48.8% yields which is 33% more than the literature value.

选用醋酸锌作催化剂，使乙酰乙酸乙酯与氨基甲酸酯在140℃反应6h，合成6-甲基-1，3-噁嗪-2，4-二酮，产率达48.8％，较文献报道值高出了33％。

And if officials on the take are not parroting the opinions of these companies, what can we suppose the money they receive is for?

如果受贿的官员不鹦鹉学舌般地复述这些公司的看法，那他们所接受的钱又能用于什么目的呢？

Love them, and love you too, Pitcher.

爱他们，也爱你，投手。