Ethyl Acetoacetate → HCID 539486, Verbindung

Reaktionsgleichung

[CH2:1](I)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11].[Na].[C:14]([O:20][CH2:21][CH3:22])(=[O:19])[CH2:15][C:16]([CH3:18])=[O:17]>C(O)C>[CH2:1]([CH:15]([C:16]([CH3:18])=[O:17])[C:14]([O:20][CH2:21][CH3:22])=[O:19])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11]

Komponenten

Versuchsvorschrift

Ethyl 2-(n-undecyl)-acetoacetate was prepared from undecyl iodide (26.6 .g) by reaction with an equivalent amount of the sodium derivative of ethyl acetoacetate in ethanol (5 hours, reflux temperature). After cooling the solvent is removed on a rotary evaporator, 300 ml of hexane is added to the residue, and the precipitate of salt is now easily filtered. The product is of sufficient purity (g.c-m.s.) to dispense with further work-up. Reaction of it (6.80 g) with 3.5-difluoroaniline (3.1 g) and 0.30 g of p-toluenesulfonic acid monohydrate in 100 ml of benzene (water separator, 3 days) produced the anilinocrotonic ester with very little of the starting materials left. After removal of the solvent, the crude product was added quickly to 30 ml of boiling Dowtherm A and kept at boiling temperature for about 10 minutes. The product crystallizes out upon cooling and is isolated by filtration and washing with hexane (50 ml).