Method for removal of oxime from aldoxime or ketoxime
A technology of ketoxime and aldoxime, applied in the field of purification of aldehyde or ketone, can solve the problems of unenvironmental protection, uneconomical and the like, and achieve the effect of reaction cleaning
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Embodiment 1
[0015] Mix 1 mmol of benzaldoxime, 0.025 mmol of dibenzyldiselenide, 0.45 mmol of hydrogen peroxide and 2 mL of petroleum ether, then heat at 60°C in air for 24 hours, and separate by column chromatography to obtain benzaldehyde in a yield of 88 %.
Embodiment 2
[0016] Embodiment 2: Other conditions are the same as in Embodiment 1, and the reactions of different organoselenium catalysts are tested, and the experimental results are shown in Table 1.
[0017] The inspection of different organic selenium catalysts in table 1
[0018] serial number Organoselenium catalyst Benzaldehyde yield / % 1 Benzene selenite 21 2 diphenyl diselenide 18 3 Di-n-butyl diselenide 0 4 2-p-trifluoromethylphenyl diselenide 10 5 Di-3,5-ditrifluoromethylphenyl diselenide 6 6 Di-m-fluorophenyl diselenide 16 7 benzyl selenous acid 90 5 Dibenzyl diselenide 88 (Example 1)
[0019] From the above results, it can be seen that benzyl selenous acid and dibenzyl diselenide as catalysts have special effects on the reaction, while other selenium catalysts have no obvious effect.
Embodiment 3
[0020] Example 3: Other conditions are the same as in Example 1, and the reactions of different molar ratios of organic selenium catalysts and oximes are tested, and the experimental results are shown in Table 2.
[0021] The inspection of the mixing molar ratio of different organic selenium catalysts and oxime of table 2
[0022] Mixing molar ratio of organoselenium catalyst to oxime 1:100 2:100 2.5:100 4:100 6:100 Benzaldehyde yield / % 71 84 88 (Example 1) 83 75
[0023] From the above results, it can be known that the mixing molar ratio of organoselenium catalyst and oxime is 2.5:100, which has the best effect (Example 1).
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