胂

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。

The best compost of catalytic-oxidation is scalpped by perpendicular experiment,the best fugitive conditions arestudied in the best of the reaction between sulphuric acid- potassium bromide and sodium iodate .

研究了在3.0mol/L的硫酸介质中，溴化钾催化碘酸钠氧化偶氮胂M褪色反应的适宜条件与影响因素，建立了催化动力学褪色光度法测定痕量碘的新方法。

Until now the drug melarsoprol was used to treat patients in the advanced stage of sleeping sickness.

直到现在，美拉胂醇依然被应用在昏睡病晚期病人的治疗中。

In the presence of tartaric acid (pH=1.5), stripping and determination of uranium are completed.

在pH =1 5的酒石酸存在下，水相样品可以直接显色测定，有机相样品用偶氮胂Ⅲ溶液反萃其中的U并同时显色测定。

The optimum reaction conditions and the influencing factors were studied. In the presence of gum arobic, arsenazo Ⅲ-barium in acid solution could combine with BSA to form a ternary complex leading to a redshift of absorption spectrum and significant increase of absorption peak intensity.

研究发现，在表面活性剂阿拉伯树胶存在下的酸性溶液中，偶氮胂Ⅲ-Ba配合物与BSA发生反应形成三元复合物，引起吸收光谱发生红移，吸收峰明显增高。

0 Mg·L-1 of roxarsone and arsanilic acid by stactic system and semi-stactic system.

L-1洛克沙胂、阿散酸的动力学过程。

Arsanilic acid ; Growing - pig ; Nutrient ; Digestive tract

对氨基苯胂酸；猪；营养物质；消化道

Mixing ratios between paraand ortho-tolyl arsonic acids ranging from 50:50 to 30:70 were effective with a peak value at 45:55 in which a maximum collecting capacity was obtained.

为降低药剂成本，利用化工厂废弃的冷母液制造混合甲苯胂酸，在工业生产中证明是十分成功的。

The mixed collectors studied were as following: benzyl arsonic acid-sodium butyl xanthate for walframite flotation, salicylohydroxamic acid-F〓, salicylohydroxamic acid-cupferron, salicylohydroxamic acid-TBP , F〓-TBP, cupferron-benzohydroxamic acid etc. for cassiterite flotation and mixed aliphatic acid or aliphatic amine for beryl or spodumene flotation.

研究过程中，本文选用了如下具体实例：苄基胂酸与丁基黄药浮选黑钨矿，水杨羟肟酸与F〓、水杨羟肟酸与铜铁灵、水杨羟肟酸与磷酸三丁酯、F〓与磷酸三丁酯、铜铁灵与苯异羟肟酸两两结合浮选锡石，混合脂肪胺与混合脂肪酸浮选锂辉石与绿柱石。

These possible mechanisms for the synthetic reaction and thesubstitution reaction of α-hyperiodine group arsonium ylides were proposed.

将它与亲核试剂作用；产生α-硒代或α-硫代胂叶立德，提出了先配位后配体偶联的可能反应机理。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。