Ethyl acetoacetate, aluminum

Liquid phase modifications. Alternatively a porous membrane can be reduced in pore size by a liquid deposition prcx ess where the membrane is dipped into a solution or sol to form deposits inside the membrane pores. For example, a silicon nitride tube with a mean pore diameter of 0.35 pm is first immersed in a solution of aluminum alcoholate (aluminum isopropylate or 2aluminum tris(ethyl acetoacetate) or ethyl acetoacetate aluminum diisopropylate) in an organic solvent (hexane, cyclohexane, benzene, isopropanol, etc.). It is then treated with saturated water vapor to hydrolyze the alcoholate or chelate to form bochmite inside the pores, thus changing the pore diameter to as small as 20 nm [Mitsubishi Heavy Ind., 1984a and 1934b]. Upon calcining at 800X, boehmite transforms into transition-alumina. 

Acetic acid, fp 16.635°C ((1), bp 117.87°C at 101.3 kPa (2), is a clear, colorless Hquid. Water is the chief impurity in acetic acid although other materials such as acetaldehyde, acetic anhydride, formic acid, biacetyl, methyl acetate, ethyl acetoacetate, iron, and mercury are also sometimes found. Water significantly lowers the freezing point of glacial acetic acid as do acetic anhydride and methyl acetate (3). The presence of acetaldehyde [75-07-0] or formic acid [64-18-6] is commonly revealed by permanganate tests biacetyl [431-03-8] and iron are indicated by color. Ethyl acetoacetate [141-97-9] may cause slight color in acetic acid and is often mistaken for formic acid because it reduces mercuric chloride to calomel. Traces of mercury provoke catastrophic corrosion of aluminum metal, often employed in shipping the acid. 

Other Methods of Preparation.—Ethyl 2-(D-ara6i no-tetrahydroxybutyl)-5-methyl-4-furoate has been prepared by heating D-glucose plus ethyl acetoacetate in aqueous alcohol without a catalyst,1 or from the same reagents (1 g. and 0.5 ml., respectively) in 0.5 ml. of 96% ethanol plus 1.5 ml. of water at room temperature in the presence of ferric chloride, zinc chloride (with small quantities of hydrochloric acid or of sodium hydroxide), cupric chloride, ferric sulfate, zinc sulfate, aluminum chloride, nickel chloride, or cobalt nitrate.18... 

The experimental simplicity of Method 3 has attracted the specialists in modern trends in catalysis. Thus, in Method 3 different authors used RbF (04SC4431), MgO (09EJM3805), KF/AI2O3, mixed magnesium-aluminum carbonate, or mixed magnesium-lanthanum oxide (08TL2730) in methanol. Recently, 2-aminopyran syntheses with acetylacetone 35 and ethyl acetoacetate 36 were carried out in an ionic liquid [(bmim)(BF4), 1-butyl-3-methylimidazolium borofluoride] with 1,1,3,3-tetramethylguanidine as... 

The aluminum derivative of ethyl acetoacetate has been prepared by the reaction of aluminum ethoxide with ethyl acetoacetate, by the reaction of amalgamated aluminum metal with ethyl acetoacetate, and by the reaction of potassium aluminate with ethyl acetoacetate. The present synthesis is a modification of the first method. 

Thirty-three grams (0.19 mol) of aluminum ethoxide is vacuum-distilled into a 250-ml. round-bottomed flask, and 80 g. (0.6 mol) of vacuum-distilled ethyl acetoacetate (59.8° at 8 mm.) is added. Other aluminum alkoxides cannot be substituted successfully for aluminum ethoxide in this synthesis since some substitution of the alkyl group of the alk-oxide, for ethyl, appears to occur in the resulting aluminum acetoacetate derivative. The flask is fitted with a reflux condenser, and the mixture is heated gently with an oil bath the temperature is raised gradually from 85 to 140° over a period of 4 hours. The aluminum ethoxide dissolves slowly as the reaction proceeds, and the ethyl alcohol formed is distilled off at 170° and 25 mm. (A considerably lower temperature can be used if a better vacuum source is available.) At the end of 4 hours the product is cooled to room... 

The aluminum derivative of ethyl acetoacetate is a white crystalHne material, reported to melt at 76°, or 78 to 79°. It supercools readily from the melt to a straw-colored, very viscous liquid. Molecular weight determinations in carbon disulfide indicate that the compound is not associated in that solvent. The aluminmn derivative of ethyl acetoacetate is very soluble in benzene, ether, and carbon disulfide. It is less soluble in petroleum ether or cyclohexane and is insoluble in water. The compound boils at 190 to 200° at 11 mm. The reported dipole moment, in benzene, is 3.96 Debye. Surface tension and density values for the liquid above the melting point have been reported by Robinson and Peak. ... 

Al(CeH908)s Aluminum derivative of ethyl acetoacetate, 9 25 AlClj, 7 167... 

Diisobutyl phthalate Dimer acid, hydrogenated Nonoxynol-1 Nonoxynol-3 Polyethylene imine Sodium hydroxide cellophane, food packaging Acrylonitrile/styrene copolymer Aluminum myristates/palmitates Aluminum silicate Ammonium lauryl sulfate Ammonium oleate Ammonium stearate Ammonium sulfate Behenamide n-Butyl acetate Butylene glycol Calcium ethyl acetoacetate Calcium stearoyl lactylate Carboxymethyl hydroxyethyl cellulose Cellulose acetate butyrate ... 

Aluminum isopropoxide (AlP) was dissolved in toluene under stirring at room temperature. Ethyl acetoacetate (EAcAc) was added to the solution as a chelating agent, and the solution was stirred for 3 h. Water was then added to the solution for hydrolysis. This solution was stirred vigorously for 12 h and used for coating. The molar ratios of toluene, EAcAc, and H2O to AlP were 28, 1 and 4, respectively. 

Aluminum trichloride exhibits several unique characteristics as a promoter of the Pechmann condensation. Not only does AICI3 lead to significantly enhanced yields in condensations that proceed either poorly or not at all in sulfuric acid (e.g., the synthesis of 4-methylcoumarin from phenol and ethyl acetoacetate j but AICI3 also exerts an unusual influence on the regiochemical outcome of the condensation of resoreinol derivatives and P-keto esters. Whereas other condensing agents favor the formation of... 

Label the Erlenmeyer flask with your name and ask your instructor to store the flask. Cover the top of the flask loosely with aluminum foil so that carbon dioxide can be expelled during the reduction. The mixture will stand, without stirring, until the next laboratory period 2-A days). At some point during the laboratory period, obtain the infrared spectrum of ethyl acetoacetate for the purpose of comparison to the reduced product. 

To a 10-mL round-bottom flask, add 0.24 g of finely ground frans-chalcone, 0.15 g of ethyl acetoacetate, and 5 mL of absolute ethanol. Swirl the flask until all or most of the solid dissolves and place a boiling stone in the flask. Add 0.25 mL of 2.2M NaOH to the mixture. Attach a water-jacketed condenser to the round-bottom flask and heat the mixture to reflux using an aluminum block and hot plate. Once the mixture has been brought to a gentle boil, continue to reflux the mixture for at least... 

AI2O3 Aluminum dibutoxide ethyl acetoacetate Ethanol HCl Photopolymer Larsen et al. (2003)... 

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