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Part A. A mixture of 2-mercaptoacetophenone (6.96 g, 45.7 mmol), chloroacetonitrile (3.00 mL, 47.4 mmol), and potassium carbonate (7.21 g, 52.2 mmol) in tetrahydrofuran (100 mL) was stirred at ambient temperature for 12 hours. The mixture was poured into water (400 mL), and this was extracted with ethyl acetate (400 mL), then methylene chloride (400 mL). The extracts were combined, dried over anhydrous magnesium sulfate, filtered and evaporated. The residual oil was separated by flash chromatography (1:4 ethyl acetate-hexane) to afford the product, phenacylthio-acetonitrile, as a pale pink oil (7.51 g, 39.3 mmol, 86%). 1H NMR (CDCl3): δ 7.96 (2H, dd, J=8.0, 1.1 Hz); 7.65-7.56(1H, m); 7.50 (2H, t, J=7.7 Hz); 4.13 (2H, s); 3.45 (2H, s). Mass spectrum (NH3 -CI/DDIP): m/z 210 (21%); 209 (100%); 192 (2%); 170 (1%); 139 (1%).

1. extractionthis was extracted with ethyl acetate (400 mL)
2. dry with materialdried over anhydrous magnesium sulfate
3. filtrationfiltered
4. customevaporated
5. customThe residual oil was separated by flash chromatography (1:4 ethyl acetate-hexane)