PURPOSE:To obtain hydrochloric acid freed from an org. cpd. by flushing hydrochloric acid, which is obtained by making HCl to be absorbed in water, to a lower pressure part than HCl absorbing part, and stripping impure substance which may be dissolved by HCl gas.OOSHIMA AKIO...
The effect of dyeing was equally good. Iodine liquid preparation: 0.01mol/l iodine liquid - called 1.3g iodine, placed in 50mol beaker, adding 2.5G potassium iodide and 25 ml distilled water, stirring constantly, so that it dissolved evenly. Add 0.2ml concentrated hydrochloric acid (volume ...
(-)-epichlorohydrinbyring-openingwithsodiumcyanidetoform(S)-4-chloro-3-hydroxybutyronitrile,whichwassubjectedtoalcoholysis,protectionofhydroxylgroupwithhexamethyldisilazane,cyanidationandthendeprotectionwithhydrochloricacid.Thetotalyieldwas57%.KeyWords:ethyl(R)-(-)-4-cyano-3-hydroxybutyrate;atorvastatin;...
The preparation of acid hydrolysis corn starch by using corn starch as raw materials,hydrochloric acid as acid hydrolysis reagent is introduced in this paper.Fluidity is used for an indication.The effect of some factors such as concentration of starch slurry,concentration of hydrochloric acid,addition...
In this study, a dip-coating of acid catalyzed sol–gel templating method was used to prepare the porous silica coatings. In the process, tetraethylorthosilicate (TEOS) was used as silica precursor, concentrated hydrochloric acid as catalyst, absolute alcohol as solvent and cationic surfactant, hexa...
a摘要:目的:探讨盐酸丁咯地尔治疗椎基底动脉动供血不足〈VBI〉的效果。 Abstract: Goal: Discussion hydrochloric acid Ding you treat zhui the basis moves the pulsation blood supply insufficient the effect.[translate] aMy best friend is getting married I very happy 我的最好的朋友结婚I非常愉快[translate...
(a total of 380 mL of methanol and water are steamed out). Monitor the reaction with thin layer chromatography until the reaction is complete, let it cool, add 200 mL concentrated hydrochloric acid and 50 mL water, stir to make it homogeneous, add 17 mL 30% hydrogen peroxide aqueous ...
Examples of the inorganic acids include hydrochloric acid, phosphoric acid, sulfuric acid, nitric acid, and tartaric acid, and examples of the organic acids include methanesulfonic acid, p-toluenesulfonic acid, acetic acid, trifluoroacetic acid, citric acid, maleic acid, succinic acid, oxalic acid, ...
The yields continued to be in the range of 89.3% to 95.2% with unsatisfactory product quality. Another Japanese Patent 79119452 (1978) attempted the purification of TBBA by dissolving it in aqueous sodium hydroxide followed by addition of hydrochloric acid to reprecipitate the product. However, ...
After cooling to room temperature, 140 cm3 of concentrated hydrochloric acid are added and the reaction mixture is again refluxed for 3 hours. This mixture is filtered while it is still hot on a sintered glass. The filtrate is concentrated to dryness under reduced pressure. The solid obtained...