Isopropanol → 4-(3,4-Dichlorophenyl)-2-oxazolone

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 2-hydroxy-3′,4′-dichloroacetophenone (10.3 g), potassium cyanide (8.1 g) and 2-propanol (100 ml) was heated to 50° C., to which was added dropwise acetic acid (6.0 g) gradually and stirred at 50° C. for 2 hours. The reaction mixture was concentrated and poured into ice water (200 ml). The solid precipitates were filtered, washed with water, and air-dried to give crystals of 4-(3′,4′-dichlorophenyl)-2-oxazolone (6.0 g, 52%). Recrystallization from tetrahydrofuran-hexane gave pale yellow prisms. Melting point 262-263° C.

Herkunft & Nachweise