丁基

The combination of ion-pair extraction technology with reversed-phase ion-pair chromatography method provide a effective inspection measure for the sulfonates in water.

样品的四丁基溴化铵和二氯甲烷离子对萃取方法与反相离子对色谱分离联用，为水体中芳香族磺酸盐的检测提供了可靠的监测手段。

The author has studied the kinetics of hydrogenation of a,β-unsaturated aldehydes andketones such as cinnamaldehyde and 2-butylene cyclopentanone,β-ionone over amorphousalloy NiB catalyst at atmospheric pressure of H2 as well as effects of reaction conditions onthe kinetics.

作者以肉桂醛和2-亚丁基环戊酮、β-紫罗兰酮为代表重点研究了非晶态NiB催化α，β-不饱和醛酮常压下选择加氢的反应动力学。常压下该反应是准一级反应。

The catalytic effect of dibutyltin dilaurate on the thermal dissociation of blocked isocyanate crosslinkers was also discussed.

运用DSC，研究了二月桂酸二丁基锡对TDI封闭物解封温度的影响。

Methyl isobutyl ketone is one of the most important chemical products, which is widely used in the field of chemical engineering.

甲基异丁基酮是一种重要的化工原料，应用十分广泛。

For example, Kolo Toure has been playing at centre back and Martin Keown is back aswell.

例如，图雷已经开始踢中后卫的位置了，而马丁·基翁也回来了。

Methods Africa clawed frogs were exposed to the water containing 50 and 100ng/L tributyltin chloride for 3 consecutive months. The changes of growth index and accumulation of lipoid in the liver were observed.

将幼龄非洲爪蟾置于浓度分别为50和100ng/L的氯化三丁基锡溶液中暴露3个月，检测非洲爪蟾的体重、体长、躯干面积和脂肪重量等生长指标和肝脏组织的脂质变化。

In our country, the acetone is mainly used to produce solvent, acetone cyanide alcohol / methyl methacrylate, methyl isobutyl ketone, bisphenol A, medicines and rubber additives.

国内丙酮主要用于溶剂、丙酮氰醇/甲基丙烯酸甲酯、甲基异丁基酮、双酚A、医药以及橡胶助剂等。

The synthesis of methyl tert-butyl ether is an important process in industrial production.

甲基叔丁基醚工业生产是典型的催化精馏过程。

The remaining three groups were given a chemical, N-butyl-N-(4-hydroxybutyl) nitrosamine in drinking water, which induces bladder cancer.

其余三组则获得化学， N -丁基的N -（ 4 -羟基）亚硝胺在饮用水，诱发膀胱癌。

Whenpyridine was used as reductive decomposing agent, the expecting cholest-4-en-3,6-dione-22-al was obtained. However, when Zn/HOAc was used to decomposethe ozonide, C-4,5 double bond was further reduced to give cholest-3,6-dione-22-al as main product. 2 For the side-chain construction of compound (1), the solid-liquid phase-transfer Wittig reaction was used. When (3-methyl-2-oxobutyl)-triphenylarsonium bromide was used as reagent, the reaction can be carried out inmild reaction condition and the yield is higher than that when phosphorane wasused.

但使用Zn／HOAc作为分解剂时，却得到其氢化产物胆甾-3， 6-二酮-22-醛；2在甾体支链引入过程中，采用固-液相转移Wittig反应的方法，用(3-甲基)-2-氧丁基三苯基溴化胂作为试剂，反应在非常温和的条件下便可完成，而且产率比传统采用膦烷的方法更高；3在对某些甾酮化合物的选择性还原反应研究时，发现在〓还原体系中，当加入某些金属离子后，反应有更好的区域选择性和立体选择性。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。