C(=O)([O-])[O-].[K+].[K+].[NH:7]1[CH2:12][CH2:11][O:10][CH2:9][CH2:8]1.[CH3:13][C:14]([CH3:18])=[CH:15][CH:16]=O>C1(C)C=CC=CC=1>[CH3:18][C:14](=[CH2:13])[CH:15]=[CH:16][N:7]1[CH2:12][CH2:11][O:10][CH2:9][CH2:8]1Anhydrous potassium carbonate (43.5 mmol; 6 g) and morpholine (308 mmol; 26.8 g) were introduced into a 100-ml Erlenmeyer equipped with a dropping funnel, under an inert atmosphere. When the reaction medium had been cooled to 0° C., prenal (150 mmol) in toluene (20 ml) was added dropwise. The temperature was allowed to rise to 20° C. and stirring was continued for 4 hours. The potassium carbonate was separated by filtration. The toluene was removed at atmospheric pressure, which permits cracking of the aminal. Under reduced pressure, the excess morpholine was distilled first, and then the expected dienamine (b.p. 108°-110° C. at 20 mm Hg) was distilled.
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