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Aldol condensation
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The obtained results showed that the heterogeneous acid catalysts as modified-Y zeolites were more effective than the heterogeneous base catalysts as hydrotalcite Mg-Al and MgO-Al2O3 mixed oxides in the aldol condensation reaction of vanillin. The highest conversion of vanillin was 95.5 % when the reaction was carried out at 120 oC in 5 hours, using sulfated Y zeolite. The catalytic activity of copper ion-exchanged Y zeolite is more stable than sulfated Y zeolite with the same reaction conditions.
13p
nguaconbaynhay10
19-02-2021
5
2
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The conventional method in presence of acetic acid gave the target product 4 in 48% for 3 hours. Meanwhile, yield of compound 7 was 15% at the same condition. Retro-Aldol condensation was observed in these cases. Structures of compounds 4 and 7 were elucidated by using IR, 1D NMR, 2D NMR, and MS methods. Biological test showed that compound 4 was active against KB cancer cell line at IC50 = 47.6 ug/L but it was inactive against bacteria.
8p
tamynhan9
02-12-2020
12
2
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Chapter 18 provides knowledge of enols, enolates, enals, and enones. The main contents of this chapter include all of the following: Keto-enol equilibria, aldol condensation, intramolecular aldol, preparation,...and other contents.
42p
larachdumlanat122
26-11-2020
10
0
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Six 5-arylidene-3-methylrhodanine derivatives were synthesized by the crossed aldolization of aromatic aldehydes with 3- methylrhodanine using 1-butyl-3-methylimidazolium chloride ([BMI]Cl) as phase transfer catalyst in water.
6p
baoanhlib
24-01-2017
53
3
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