3-(Dimethylamino)-2-propenal → HCID 178500406, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Pyridiniumtetrafluoroborate (283.7 g, 1.70 mol) was added to a solution of methyl-(2E)-3-(3-dimethylamino)prop-2-enoate in 442.5 ml acetic anhydride/acetic acid (2:1). The resulting suspension was cooled to 0° C. and 3-dimethylaminoacroleine (169.9 ml, 1.70 mol) was added slowly over the course of 3 hrs. under vigorous stirring and cooling with an ice bath, a yellow-brown precipitate formed. After further stirring for 2 hrs. at room temperature the reaction mixture was filtered. The remaining solid was washed with diethylether several times and dried under reduced pressure. Re crystallization from i-propanol/ethanol (2:1) gave 326.7 g (65%) of the pentamethinium salt as yellow crystals.

Herkunft & Nachweise