酸酐

Treatment of the diacetoxy-calix [4] arene with a series of ditosylates in dry MeCN in the presence of NaOH resulted in formation of electron-rich calix [4] areneocrowns, which reacted with 4, 4'-bipyrindinium and p-bis -benzene at room temperature in dry MeCN to afford self-assembling [2] catenanes by π-π stacking interaction.

以杯[4]芳烃为原料，通过三氟乙酸铊将其氧化成醌，醌类化合物在Zn粉、冰醋酸、少量盐酸和过量的乙酸酐中反应得到双乙酰化产物，利用氢氧化钠使其水解，然后再与各种对甲苯磺酸二酯进行环化反应，得到一系列具有富电子空腔的杯[4]芳烃并冠醚。

The influence factors such as amount of catalyst,molar ratio of maleic anhydride to n-butanol,and reaction time on the yield of dibutyl maleate were discussed.

以La2(SO4)3/SiO2为催化剂，顺丁烯二酸酐和丁醇为原料，合成内增塑剂顺丁烯二酸二丁酯，探讨了催化剂用量，酐醇物质的量比以及反应时间等对收率的影响。

The Chemical method is based on the Diels-Alder reaction of conjugated dienes with maleic anhydride and the chromatographic analysis use a packed column with SE-30 as stationary phase.

建立了用共轭二烯烃与马来酸酐Diels-Alder特性反应和非极性固定液SE-30填充柱1m×1。

In this paper,the effect of stoichiometric ratio of anhydride/epoxide on thermal properties of curing products of epoxy resin was discussed.

研究了酸酐/环氧当量比 r对双酚A型E-44环氧树脂固化物耐热性能的影响。

The result showed that the degradation of polyitaconic anhydride in phosphate buffer solutions was the first-order reaction, and its degradation apparent constants were 0.0498, 0.0576 and 0. 1382h~(-1) in ph...

结果表明，聚衣康酸酐在磷酸缓冲溶液中的降解符合一级反应动力学规律，在pH值为5、7.4和8.8的缓释溶液中的表观速率常数分别为0.0498、0.0576和0.1382h~(-1)。

In home, due to the shortage of polyester glycol, one of raw materials of preparing water-borne polyurethane, aromatic polyester glycols having designed molecular weight of 600,1000 and 2000 are synthesized in lab.

由于国内缺乏制备水性聚氨酯的原料聚酯二醇，实验自制了设计分子量为600、1000和2000的芳香族聚酯二醇；其中以邻苯二甲酸酐、间苯二甲酸、对苯二甲酸为二元酸，乙二醇、1，3—丙二醇和新戊二醇等为二元醇。

It can also be seen as a mixed anhydride, its structure can be used RCOX (R on behalf of alkyl, X on behalf of halogens) said.

它也可看作是一种混合酸酐，其结构可用RCOX（R代表烃基，X代表卤素）表示。

Two types of haptens, the earboxylated propyl amino derivative of the acid moiety (HCA1) that is the hydrolyzed product of cyhalothrin, and the carboxylated ethyl carbonyl derivative of the alcohol moiety (HCB2) were synthesized, and conjugated with the carrier proteins bovine serum albumin and ovalbumin respectively by the active ester method and the mixed anhydride method. The polyclonal antibodies were obtained after immuning to the New Zealand rabbits.

通过对氯氟氰菊酯分子结构中的酸部分接4-氨基丁酸(HCA1)和醇部分接丁二酸酐(HCB2)，合成两种不同的半抗原，并通过碳二亚胺法将HCA1和HCB2分别与牛血清蛋白偶联制备了人工抗原HCA1-BSA和HCB2-BSA，通过活泼酯法将HCA1、HCAS和HCB2分别与卵清蛋白偶联制备包被抗原，两种人工抗原通过免疫新西兰大白兔来制备相应的多克隆抗体。

With this aim, two different haptens mono- O -3-carboxypropyl- diethylstilbestrol and mono- O -carboxymethyldiethylstilbestrol with carboxylic group that preserve the molecular structure character of diethylstilbestrol were synthesized. The haptens were conjugated with the carrier proteins bovine serum albumin by mixed-anhydride method for immunogen and conjugated with ovalbumin by active ester method for coating antigen.

首先，两种保留己烯雌酚特征结构并具有活性基团的半抗原正丁酸己烯雌酚单醚、乙酸己烯雌酚单醚被合成；然后采用混合酸酐法将半抗原与BSA偶联制备成免疫原，采用活性酯法将办抗原与OVA偶联制备了包被原。

A series of imides oligomers were synthesized with the phenylethynylphthalic anhydride , nadic anhydride and cyanophthalic anhydride as endcapped agents.

我们以苯乙炔苯酐、降冰片烯二酸酐和氰基苯酐为封端剂合成了一系列的酰亚胺低聚物。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。