For anhydrous diethyl ether, the product from the condensation is dried over thin slices of metallic sodium followed by distillation in a water bath. A more convenient method of drying laboratory diethyl ether is to use a desiccant such as molecular sieves, which are interconnecting networks of al...
of catalyst anhydrous potassium carbonate to total alkali of tetrahydroxy berberine Then, add the same amount of sodium borohydride three times every 10 minutes, totaling 0.80g, and the mass ratio of the total amount of sodium borohydride to the total alkali of tetrahydroxy berberine is 0.80:1. ...
aSulphuryl chloride 200g is added dropwise to dry malonic acid 104g under anhydrous ether 500ml during 4-5h. When the evolution of gas has ceased, the ether is evaporated(bath temperature not above 50-55℃), and the residue kept at 0℃ overnight when it crystallizes. The mother liquor ...
1. React L-serine with methanol in the presence of carbon dioxide to obtain L-serine methyl ester. 2. Dissolve L-serine methyl ester in anhydrous ether, add hydrochloric acid, cool to around 0℃, and react for 3 hours to obtain L-Serine methyl ester hydrochloride. This method is simple ...
It is soluble in dimethyl sulfoxide, dimethyl formamide, glacial acetic acid and chloroform, slightly soluble in ethanol, sparingly soluble in water, and practically insoluble in ether. At a pH of 0.6-5.8, levofloxacin water solubility is constant at approximately 100 pg/mL (sparingly soluble). ...
PETROLEUM ETHER, also known as petroleum ether, is composed of pentane and hexane. It is a colorless and transparent liquid with a petroleum-like odor. PETROLEUM ETHER is mainly used as a solvent and for the extraction of oils and fats. It is insoluble in water but soluble in anhydrous eth...
a乙醇提取物()、无水乙醚提取物、乙酸乙酯提取物、丙酮提取物和水提取 Ethyl alcohol extraction (), anhydrous ether extraction, ethyl acetate extraction, acetone extract and water extraction [translate] a我身为一个中国人,没有去过长城太可惜了 My body is a Chinese, has not gone to the Great Wall...
of an anhydrous base to produce an ester. Catalysts are aluminium alkoxides or sodium alkoxides. The reaction between benzaldehyde and sodium benzyl oxide (generated from sodium and benzyl alcohol) gives benzyl benzoate. This tactic is employed within the production of ethyl acetate from acetal...
Ethyl magnesium bromide is prepared in the usual way by reacting 185 parts by weight of ethyl bromide in 800 parts of anhydrous ether with 37 parts by weight of magnesium turnings. Under vigorous stirring 121 parts of 2,6- dimethyl aniline are added at a rate depending on the vigor of the...
It is then recrystallised twice from anhydrous diethyl ether under argon, and stored under argon [Blackstock et al. J Org Chem 52 1451 1987]. [Beilstein 23/3 V 487.] Reactions and applications The pKa of [HDABCO]+ (the protonated derivative) is 8.8, which is almost the same as ...