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|Section2= |Section7= }} 3-Pentanone (also known as diethyl ketone) is a simple, symmetrical dialkyl ketone. It is a colorless liquid ketone with an odor like that of acetone. It is soluble in about 25 parts water, but miscible with organic solvents. It is mainly used as a solvent in paint and a precursor to vitamin E.〔Hardo Siegel, Manfred Eggersdorfer "Ketones" in Ullmann's Encyclopedia of Industrial Chemistry Wiley-VCH, 2002 by Wiley-VCH, Wienheim. 〕 It is easily soluble in diethyl ether and partially soluble in acetone, methanol, and water.〔 Two related and more important ketones are 2-pentanone and methyl isopropyl ketone. ==Syntheses== 3-Pentanone is produced industrially from propionic acid using metal oxide catalysts: :2 CH3CH2CO2H → (CH3CH2)2CO + CO2 + H2O It can also be prepared by ketonic decarboxylation of propanoic acid over a manganese(II) oxide catalyst in a tube furnace or from ethylene, CO, and H2.〔 In the case of dicobalt octacarbonyl or Co2(CO)8 as a catalyst, 3-pentanone can arise from ethylene and CO, in the absence of hydrogen. A proposed intermediate is the ethylene-propionyl species () which undergoes a migratory insertion to form (). The required hydrogen arises from the water shift reaction. For details, see〔 〕 If the water shift reaction is not operative, the reaction affords a polymer containing alternating carbon monoxide and ethylene units. Such aliphatic polyketones are more conventionally prepared using palladium catalysts. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「3-Pentanone」の詳細全文を読む スポンサード リンク
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