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50 g (0.2 mol) of 2,6-dimethyl-N-(2-furoyl)-N-propargyl-aniline were dissolved in 200 ml of anhydrous tetrahydrofuran, and 150 mg of potassium tert.-butylate were added. During this procedure, the temperature of the solution rose to about 50° C., the solution becoming colored. The reaction mixture was left to stand for 2 hours and then poured onto 500 ml of water. The crystalline product which had precipitated was filtered off, dried and recrystallized from ethyl acetate/petroleum ether. 24 g (48% of theory) of 2,6-dimethyl-N-allenyl-N-(2-furoyl)-aniline of melting point 138°-41° C. were obtained. (The 1H-NMR spectrum indicated complete isomerization). ##STR99##

1. customrose to about 50° C.
2. waitThe reaction mixture was left
3. customThe crystalline product which had precipitated
4. filtrationwas filtered off
5. customdried
6. customrecrystallized from ethyl acetate/petroleum ether