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weak base
相关语句
  相似匹配句对
     It’s base on the .
     它基于.
     weak R& D ;
     研发能力弱;
短句来源
     On the base of G.
     在G.
短句来源
     Weak Base and Covering Property
     弱基与覆盖性质
短句来源
     Treatment of weak base foundation
     软弱地基基础的处理
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  weak base
Benzydamine is a weak base unlike the aspirin-like drugs which are acids or metabolized to acids.
      
HCl salts of weak base drugs had much slower release rates than did those of neutral drugs (eg, theophylline) as drug loading increased.
      
Drug release kinetics were dependent on the pH of the dissolution medium and the drug properties, such as solubility, salt forms of weak acid and weak base drugs, and drug loading.
      
Such reinforcement reduces severalfold settlements and consolidation time of a weak base and also increases its resistance to horizontal (including dynamic) loads.
      
Progabide behaved as a typical weak base, with its solubility increasing with a decrease in pH.
      
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Potassium antimonyltartrate (Ⅰ) is an effective schistosomacidal agent. It would be of interest to see the activity of its corresponding pentavalent antimony derivative. Furthermore, chelation of the latter compound with various hydroxy acids would give a series of new compounds with different degree of stability, which might have some relations with their pharmacological properties. Treatment of aqueous potassium antimonyltartrate (Ⅰ) with 30% hydrogen peroxide gave the corresponding pentavalent antimonyltartrate...

Potassium antimonyltartrate (Ⅰ) is an effective schistosomacidal agent. It would be of interest to see the activity of its corresponding pentavalent antimony derivative. Furthermore, chelation of the latter compound with various hydroxy acids would give a series of new compounds with different degree of stability, which might have some relations with their pharmacological properties. Treatment of aqueous potassium antimonyltartrate (Ⅰ) with 30% hydrogen peroxide gave the corresponding pentavalent antimonyltartrate (Ⅱa). This compound is a weak acid, forms a di-potassium salt (Ⅱb) with potassium hydroxide but does not react with weak bases such as diethylamine or pyridine. Ⅱa, on boiling with potassium bitartrate, gave di-potassium antimonyl~(V) ditartrate (Ⅲ). This new compound could also be formed by the oxidation of antimony trichloride by means of hydrogen peroxide followed by chelation with tartaric acid and then neutralization with potassium hydroxide. Similar complexes were prepared by the action of glyceric acid, D-gluconic acid, mucic acid and gallic acid on Ⅱa. These new compounds are water-soluble substances, and they are suitable for injection. Preliminary pharmacological examination showed that they had quite low toxicity.

酒石酸銻鉀(Ⅰ)用过氧化氫氧化后生成相应五价銻化合物(Ⅱa),它与二乙胺或吡啶等弱碱不能成鹽,但与氫氧化鉀生成鉀鹽(Ⅱb),酒石酸銻鉀(Ⅱa)与酒石酸氫鉀、甘油酸、葡萄糖酸、半乳糖二酸及沒食子酸作用,生成相应于Ⅲ結構的螯合鹽。

Up to the present, no general formula, covering all kinds of multiple equilibrium systems of mixed acids and bases has appeared in chemical literature. Based upon the various conditions of the content, the charge and the equilibrium, the present paper has derived systematically five content equations according to different types of acids and bases as follows:Strong acids, weak acids, strong bases, weak bases and amphiprotic substances.The outstanding advantage of the above-mentioned...

Up to the present, no general formula, covering all kinds of multiple equilibrium systems of mixed acids and bases has appeared in chemical literature. Based upon the various conditions of the content, the charge and the equilibrium, the present paper has derived systematically five content equations according to different types of acids and bases as follows:Strong acids, weak acids, strong bases, weak bases and amphiprotic substances.The outstanding advantage of the above-mentioned equations lies in their being susceptible of addition. So these content equations are convenient for the calculation of any multiple equilibrium system of mixed acids and bases.

目前在化学文献中还没有一个能够包括各种混合酸碱的复杂体系的通用计算公式。本文根据含量条件、电荷条件以及平衡条件,并按照各种酸碱的类型,分别系统地推导出五种含量方程式如下: 强酸、弱酸、强碱、弱碱和两性物质。上面各种类型的含量方程式的优点是它们的可加性,因此这些方程式可以对任何复杂的酸碱平衡体系进行计算。

Perfluoroacyl fluoride was used to catalyze the reaction of cyanuric chloride with KF in diglyme at 80℃ to give cyanuric fluoride in 80-90% yield. At room temperature, cyanuric fluoride reacted with hexafluoropropene in the persence of KF to give monoand di-perfluoroisopropyl-s-triazine, however, with perfluoro-n-propyl-vinyl ether to give only small amount of the corresponding monoperfluoroalkyl product. The yield was not improved much even at 100℃ for 13.5 hrs. Both the fluorine atom and the perfluoroalkyl...

Perfluoroacyl fluoride was used to catalyze the reaction of cyanuric chloride with KF in diglyme at 80℃ to give cyanuric fluoride in 80-90% yield. At room temperature, cyanuric fluoride reacted with hexafluoropropene in the persence of KF to give monoand di-perfluoroisopropyl-s-triazine, however, with perfluoro-n-propyl-vinyl ether to give only small amount of the corresponding monoperfluoroalkyl product. The yield was not improved much even at 100℃ for 13.5 hrs. Both the fluorine atom and the perfluoroalkyl group of the partially substituted perfluoro-s-triazine were readily displaced by sodium methoxide, whereas treatment of the triazine with methanol in combination with the weaker bases calcium carbonate or potassium fluoride only the fluorine atom was displaced and the perfluoroalkyl group unaffected.

采用全氟酰氟为催化剂,三聚氰氯与氟化钾在二乙二醇二甲醚中于80℃反应,可制得三聚氰氟,产率为80~90%。当等克分子三聚氰氟与六氟丙烯在氟化钾催化下,室温反应18小时,即可得一、二全氟烷基取代产物。全氟正丙基乙烯基醚可以参与类似反应,但要困难得多。当等克分子全氟正丙基乙烯基醚与三聚氰氟在100℃反应13.5小时,大部分回收,只得少量的一取代产物。三嗪环上的全氟烷基及氟原子易被醇钠进攻。应用碱性较弱的碳酸钙或氟化钾作为酸的受体,可使三嗪环上的氟为甲氧基所取代,而保留全氟烷基。

 
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