环二酯

In addition, the reactions of the carbodiimide with alkanol and substituted phenol were studied firstly.

研究了4-酯基吡唑-5-碳二亚胺(Pyrazole-5-N=C=N-Ar)与NH_3，RNH_2，R_2NH和RNHNH_2成环反应的选择性。

Our research focused on the synthesis of heterocyclic compounds through the reaction between the dihalogen compounds and amides or carbamates.

我们小组首次进行了二卤代化合物和酰胺或氨基酸酯之间偶联反应的研究，以期发展构筑氮杂环化合物的新方法。

The effect of different factors was investigated and the main process conditions were obtained: addition temperature120~140℃,esterify temperature:160~175℃,n:n=3~4:1mol:mol）,n(DCPD:n =0.6~0.8:1mol:mol）,the amount of catalyst is

双环戊二烯的含量低于80%，研究了各种影响因素，得出主要工艺条件：加成温度为120~140℃，酯化温度为160~175℃，n：n=3~4：1，n：n=0.6~0.8：1，催化剂用量为0.1~0.2%，树脂收率达

The invention relates to a mixed additive used in lithium secondary battery electrolyte, which is characterized in that: its components comprises that biphenyl at 0.5-95.4%, phenylcyclohexyl at 1.1-93.8%, vinylene carbonate at 0.4-93.2%, tertiary carbon alkyl benzene at 0.5-96.5%; and ethenyl sulfonyl benzene at

本发明公开了一种锂离子二次电池电解液用混合添加剂，其特征在于：组分与重量％分别是：联苯类0.5％～95.4％；环己基苯类1.1％～93.8％；碳酸亚乙烯酯0.4％～93.2％；叔碳烷基苯0.5％～96.5％；乙烯基硫酰苯0.5％～95.8％。

Tert-Butyldimethylsilyloxy) glutaric anhydride, as an important drug intermediate, is synthesized from citric acid by decarboxylation, reduction, hydroxyl protection, esterolysis, cyclization, with the total yield of 30.3%.

介绍了以柠檬酸为起始原料合成3-戊二酸酐的方法。该路线经脱羧反应、加氢还原、羟基保护、酯水解和再闭环，以总收率为30.3%得到目的产物。

Mechanism of poly(dioxanone- co -glycolide) sutures in vitro degradation was studied by DSC and X-ray diffraction and the surface morphology was studied with photography for the purpose of improving properties of absorbable sutures.

用DSC和X-ray衍射法对聚对二氧环己酮-乙交酯缝合线的初期体外降解过程进行了研究，并使用纤维摄影仪对纤维在降解过程中的表面形态变化进行了观察。

This paperindicated that it was good for condensation reaction when benzene-ring bearingelectron-attaching groups. It also showed that and the 6-hydroxyl group could bereacted with acyl halide, haloid ether and halo alkene, but not with halo alkane. It wasnot only the first time to find that the reaction product of D-mannitol and aromaticaldehyde is tri-condensation derivatives, but also the first time to obtain thep-phthaldehyde-sorbitol derivatives containing eight hydroxyl groups.

研究发现：苯环上有吸电子基团时对缩合反应有利；多元醇缩醛衍生物6-羟基除与酰氯反应外，也能和卤代酸酯、溴代烯反应，但不与卤代烷反应；首次发现D-甘露醇与醛反应主要得到三缩合物；首次合成了含有8个羟基的对苯二甲醛和山梨醇的缩合物。

For the production of reactive polyurethane cross-linkinger and curing agents, 2, 4-diisocyanate toluene terpolymer, which possesses the rigid structures of hexatomic ring and three reactive functional groups, was synthesized and characterized by the Fourier transform infrared, the gel permeation chromatography and the chemical analysis methods.

为了制备高活性聚氨酯交联固化剂，用2，4-二异氰酸基甲苯三元聚合反应合成了具有3个活性异氰酸根的六元环结构异氰脲酸酯。

The polyvinyl chloride static and dynamic experiments of the heat stability by three novel low-lead, non-lead and low-tin, and non-lead and non-tin thermal stabilizers remixed respectively with phosphite ester, epoxidized soybean oil,β-diketone, pentaerythritol and houghite were reviewed.

通过新型低铅、无铅低锡和无铅无锡热稳定剂分别与亚磷酸酯、环氧大豆油、β-二酮、季戊四醇和水滑石进行复配，进行了聚氯乙烯的静态和动态热稳定性实验。

In this dissertation, polyethylene glycol monomethyl ether of 2000 molecular weight as soluble support, an array of soluble polymer-supported tartrate esters were designed, synthesized, and applied in asymmetric epoxidation of allylic alcohols.

本论文以平均分子量为2000的聚乙二醇单甲醚为可溶性支载体设计和合成了一系列可溶性聚合物支载的酒石酸酯配体，并将它们用于烯丙基醇的不对称环氧化反应。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。