请教做无水四氢呋喃中二苯甲酮作指示剂的变色机理?？ 好问题,一直就那么用也没深究过,原来如此呀 那不是说这种方法不可取了吗？ our studies have shown that while the thf produced from the still is free of oxygen and low in water (10 ppm), it does contain benzene contamination. the presence of benzene could interfere with critical applications. additionally, the blue color of the benzophenone ketyl is not a very reliable indication of anhydrous conditions. these results are very significant since they provide the chemist real information on the purity of the tetrahydrofuran produced from the sodium/benzophenone still. in contrast our new thf is oxygen free, contains less that 5 ppm of peroxides. our water content is less than 10 ppm and our material is free of impurities such as benzene. 还有，蒸的过程中先变蓝，一直通ｎ2,后来兰色褪去，是不是说明二苯甲酮参与反应没有了呢？那么再加ｔｈｆ接着蒸时，还要加二苯甲酮吧 查看更多
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