2,2-Diethoxyethylamine → alpha-(2,2-Diethoxyethylamino)-beta-nitrostyrene

Beteiligte Stoffe

Reaktionsschritte

Alpha-nitro acetophenone (5.7 g, 0.0345 mol) is taken up in 100 mL toluene and 4.6 g (0.0345 mol) of amino acetaldehyde diethyl acetal is added. The reactants are put into a 250 mL RB flask fitted with a Dean-Stark trap. The trap is filled with 4A molecular sieves and the mixture is heated at reflux for 18 hours. The toluene is removed in vacuo to give 8.36 g of α-(2,2-diethoxyethylamino)-β-nitrostyrene as a brown oil. To this oil is added 50 mL of concentrated HCl. As the flask is swirled the oil turns to a yellow suspension. After 10 minutes the solid is filtered to give 2.48 g of a yellow solid. Recrystallization from ether/ethylacetate/hexane gives the product as two fractions, 2.08 g of mp 190°-192° C.

Herkunft & Nachweise