2-Chloroethanol → 2-(2-Chloroethoxy)-2-methylpropanenitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Additional procedure. ZnCl2 (352.3 g 2.59 moles) was added to a 2 L round bottom flask equipped with a mechanical stirrer, nitrogen inlet-outlet, temperature probe, and condenser. Acetone cyanohydrin (110.0 g 1.29 moles) was slowly added to the stirred solid over 30 minutes keeping the temperature below 32° C. with external cooling. To the slurry, 2-chloroethanol (124.9 g 1.55 moles) was slowly added over 20 minutes keeping the temperature below 32° C. with external cooling. Acetone (3.75 g, 64.6 mmoles) was added and the mixture was heated to 60° C. After stirring for 4 h at 60° C., the reaction mixture was cooled to 30-35° C., diluted with water (1.10 L) and extracted with CH2Cl2 (1×440 mL and 1×220 mL). The combined CH2Cl2 extracts were washed with 0.5M sodium bicarbonate (330 mL), followed by water (3×330 mL). The dichloromethane solution was concentrated under vacuum to afford crude product (109 g). The crude product was purified by vacuum distillation (10 mm Hg) using a Vigreux column. The fraction boiling at 60-80° C. was collected to afford 2-(2-chloroethoxy)-2-methylpropanenitrile as colorless oil (88.7 g).

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