反应详情

120 ml of a toluene suspension of 50.40 g (0.62 mol) of dimethylammonium chloride were introduced with good stirring in the course of half an hour into 274.5 g of a toluene suspension which originated from the preparation of sodium ethyl formylacetate and which contained 71.2 g (0.515 mol) of sodium ethyl formylacetate. The reddish orange-coloured, mobile suspension was freed on a rotary evaporator in a slight vacuum (about 300 mbar) from low-boiling components and from about 80 to 90% of the toluene including the water passing over azeotropically. The solids were filtered off with suction and washed with 50 ml of toluene, and the combined filtrates were distilled in vacuo without a column. After a forerun of toluene, 85.8 g of colourless ethyl N,N-dimethyl-β-aminoacrylate passed over at 0.6 mbar and a head temperature of 94° to 95° C.

1. additionwere introduced
2. customThe reddish orange-coloured, mobile suspension was freed on a rotary evaporator in a slight vacuum (about 300 mbar) from low-boiling components and from about 80 to 90% of the toluene including the water passing over azeotropically
3. filtrationThe solids were filtered off with suction
4. washwashed with 50 ml of toluene
5. distillationthe combined filtrates were distilled in vacuo without a column
6. customa head temperature of 94° to 95° C.