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jsczlimin
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2Â¥2013-07-11 13:43:26
tangfh1973
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zhoupeng87: ½ð±Ò+5, »¶Ó½»Á÷ 2013-07-30 08:01:08
zhoupeng87: ½ð±Ò+5, »¶Ó½»Á÷ 2013-07-30 08:01:08
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2,5-Dichlorobenzophenone To a 22 L, three-necked flask fitted with a thermometer, mechanical stirrer and a Vigreux column connected to an aqueous NaOH scrubbing tower, was added 1,4-dichlorobenzene (3 Kg, 26.4 mol) and benzoyl chloride (2.6 Kg, 18.55 mol). The mixture was heated to 80¡ã C. to give a homogeneous solution. Aluminum chloride (5.5 Kg, 41.25 mol) was added over 12 min. with stirring. (The molar ratio of reactants was 2.2:1.4:1.0 (AlCl3: Dichlorobenzene:Benzoyl Chloride)). The resulting mixture was heated to 140¡ã C. over 60 min followed by heating to 175¡ã C. over 30 min. Heating was stopped at 175¡ã C. The mixture was allowed to cool to 80¡ã C. over two hours and poured into a well stirred mixture of ice and water (ca. 25 L water and 15 Kg of ice) over 30 min. The organic solid was collected by filtration and dissolved in 7 L of toluene. The solution was washed with aqueous sodium bicarbonate and dried. Toluene was removed by distillation. Pure 2,5-dichlorobenzophenone was isolated in 80percent yield after recrystallization from hexane and toluene. Gas chromatography indicated an absolute yield of 97percent. |

3Â¥2013-07-29 10:54:26














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