酸酐

Monocholesterylsuccinate is synthesized using cholesterol and succinic anhydride as raw materials in heptane and trace pyridine as catalyst.

以正庚烷为溶剂、吡啶为催化剂，采用丁二酸酐和胆固醇以均相法合成了丁二酸单胆固醇酯。

The experimental result showed that three byproducts was formed and the optimal condition was as follows: the molar ratio of ethylene glycol, hydrogen bromide, and acetic acid was 1:1:1.3, when ethylene glycol was 1 mol, refluxed 5 h under the action of 100 mL toluene.

结果表明：较适宜的合成条件为乙二醇1 mol， n：n：n=1：1：1.3，在带水剂甲苯(100 mL)的作用下，回流反应5 h，约4 h后分两次追加0.12×2 mol醋酸酐，合成效果最好，产率可达到95%，反应副产2-溴乙醇及少量的1， 2-二溴乙烷、乙二醇二乙酸酯和二乙二醇二乙酸酯。

12 In patients with normal renal function, chronic hypercalcemia may be associated with an increase in serum creatinine.

对于肾功能正常的患者，慢性高钙血症可能 www.ssBBww.cOm 与血清肌酸酐增多有关。

12 In patients with normal renal function, chronic hypercalcemia may be associate d with an

对于肾功能正常的患者，慢性高钙血症可能与血清肌酸酐增多有关。

12 In patients with normal renal function, chronic hypercalcemia may be a ociated with an increase in serum creatinine.

对于肾功能正常的患者，慢性高钙血症可能与血清肌酸酐增多有关。

20 New carbonyl functionalized imide derivatives were synthesized by the direct reaction of aminoacids with anhydride s.

首次用氨基酸与一系列酸酐直接反应，合成了20个含羧基的酰亚胺，对其结构进行了表征。

2 New carbonyl functionalized imide derivatives of maleimide were synthesized by the direct reaction of amino acids with maleic anhydride.

用氨基酸与苹果酸酐直接反应，合成了两个含羧基官能团的苹果酰亚胺，为氨基酸氮端的保护以及含羧基官能团的酰亚胺类化合物的合成提供了一种直接、简便的新方法。

The indene maleic anhydride copolymers were synthesized with naphtha oil at 70～85℃ in the presence of 1.0%～2.0% initiator.The yield was more than 90%.The chemical structure of the copolymer was confirmed by IR.

以轻煤焦油为原料，在温度为70～85℃，引发剂为单体总质量的1.0％～2.0％的聚合条件下，合成了茚－马来酸酐共聚物，得率在90％以上。

Green scale inhibiter ; polyaspartic acid ; maleic anhydride ; synthesis ; biodegradation

绿色阻垢剂；聚天冬氨酸；马来酸酐；合成；生物降解

Aim To prepare lower degree of substituted starch acetate with cassava starch as material, acetic anhydride as acetylation reagent, sodium hydroxide as catalyst and sodium sulfate as gelatinization inhibiter.

目的 以木薯淀粉为原料，醋酸酐为乙酰化试剂，NaOH为催化剂，Na2SO4为膨胀抑制剂，制备了低取代度木薯淀粉醋酸酯。

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。