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Diethylacetic acid anhydride

It was mixed 120 parts of urea and 258 parts of bromodiethylacetylbromide (prepared from diethylacetic acid anhydride and bromine). After 12 hours the mixture was heated for 3 hours at 100°C. The product was mixed with an aqueous solution of sodium bicarbonate and then was filtered. The obtained bromodiethylacetylurea was crystallized from diluted ethanol melting point 114-118°C. The mixture of 474 parts of bromodiethylacetylurea, 1000 parts of acetic anhydride and 75 parts ZnCI2 was heated at 60°C for 1 hour. The product was stirred with 3000 parts of ice-water and then l-acetyl-3-(a-bromo-a-ethylbutyryl)urea was filtered melting point 108-109°C. [Pg.27]

The replacement of ring C by a cyclic anhydride ring could be looked upon either as elimination of ring C or replacement of the ring by a heterocyclic anhydride ring. In any case, Fields et al. showed that quinolizinium 2,3-dicarboxylic acid anhydride (37) underwent cycloaddition reactions with either cyclopentadiene or styrene to alFord the expected products (e.g., 38). The 2,3-dimethylquinolizinium ion did not undergo cycloaddition even with the more reactive ketene diethylacetal. [Pg.301]

Dehydration Alumina (see also Dihydropyrane, preparation). Boric acid. Boron triSuoride. N-Bromoacetamide-Pyridine-SOj. Dicyclohexylcarbodiimide. Diketene. Dimethylform-amide-Thionyl chloride. Dimethyl sulfoxide. Ethylene chlorophosphite. Florisil. Girard s reagent. Hydrobromic acid. Iodine. Mesyl chloride-Sulfur dioxide. Methyl chlorosulfite. Methylketene diethylacetal. Naphthalene-d-sulfonic acid. Oxalic acid. Phenyl isocyanate. Phosgene. Phosphorus pentoxide. Phosphoryl chloride. Phthalic anhydride. Potassium bisulfate. Pyridine. Thionyi chloride. Thoria. p-Toluenesulfonic acid. p-Toluenesulfonyl chloride. Triphenylphosphine dibromide. [Pg.1387]


See other pages where Diethylacetic acid anhydride is mentioned: [Pg.27]    [Pg.27]    [Pg.122]    [Pg.264]    [Pg.135]   


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