乙酯

Keywords malonic acid;diethyl malonate;hydrolysis reaction

丙二酸；丙二酸二乙酯；水解反应

A key intermediate of abacavir, named N-(2-amino-4,6-dichloro-5-pyrimidinyl) formamide was synthesized from diethyl malonate and guanidine hydrochloride. This method suits to industry for large scale. The materials are easy to get and very cheap.

2-氨基-4，6-二氯-5-甲酰氨基嘧啶是合成阿巴卡韦的关键中间体，本文拟以丙二酸二乙酯和盐酸胍为起始原料合成这一关键中间体，具有原料来源广，适合大规模生产等优点。

The free-radical addition reaction of malonic ester with a series of alkenes under the uniform conditions has been studied.

在相同反应条件下，进行一系列烯烃与丙二酸二乙酯的加成反应，求得产率与烯烃结构间的定量关系，即反S型曲线。

The details and results are summarized below:(1)An ABC style three component cascade reaction of aromatic aldehydes, aromatic amines and diethyl malonic ester or cyclohexanone has been developed.

论文从苯炔和亚胺出发，设计并系统研究了4种新的多组分串联反应，主要内容和结果如下：(1)发展了一种芳醛、芳胺和丙二酸二乙酯或环己酮的ABC型三组分串联反应。

Lipase-catalyzed optical resolution of R-mandelic acid via RS-ethyl mandelate in non-aqueous media was studied.

对在非水体系中，利用脂肪酶催化水解扁桃酸乙酯外消旋混合物拆分R-扁桃酸进行了初步的研究。

Method］Raw material was extracted by 50% ethanol,then purified by acetic ethyl.The extract was injected into LC/MS after filtering with micromembrane.

方法］叶下珠药材，以50%乙醇提取，乙酸乙酯萃取，萃取液过微孔滤膜后，采用LC/MS对各成分分离鉴定。

Methods: Micromembrane filtration,ethyl acetate-formalin separation,giemsa stain.

微孔滤膜过滤、乙酸乙酯福尔马林分离、G iem sa染色、油镜及相差显微镜观察。

With the increase in CO(NH2)2 concentration,the molecular weight significantly increased,and the best concentration scope of DMAEMA was 0.06%-0.10%.Inaddition,the agents for preventing cross-linking were used to prevent the cross-linking reaction and it content was not allowed too high,and the best concentration scope of sodium acetate(the regulator of molecula weight)was

在此中和度下，AMPS的适宜用量范围为AM的75%～16.25%；AA的适宜用量范围44%～55%；(NH4)2S2O8的适宜用量范围为AM/AA/AMPS总量的0.07%～0.12%；分子量随CO(NH2)2的增加而明显升高；甲基丙烯酸N，N-二甲氨基乙酯的适宜用量范围为0.06 %～0.10%；使用抗交联剂可以解决产品交联造成的难溶问题，但加入量不宜过多，否则分子量会下降；分子量调节剂醋酸钠的用量在1.24 %～1.54%范围内可以使产品的分子量达最佳值。

A method for synthesizing sodium sulfoacetic is discussed,which sodium sulfoacetic is synthesized with sodium sulfite and ethyl monochloro acetate,with sodium sulfite and chloroacetic acid.

主要分别介绍用亚硫酸钠与氯乙酸乙酯合成磺酸乙酸钠和亚硫酸钠与氯乙酸合成磺酸乙酸钠。

The mutagen amount used is 1%, when the mutafacient time is 50 minutes, this strain lethality rate is 75%.

以其作为出发株，得出了以硫酸二乙酯诱变该株的致死率曲线，诱变剂用量为1%、诱变时间为50min时，该株的致死率达到75%。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。