Benzene → HCID 14500738, compound

Participants

Reaction Steps

A stirred slurry of 2.5 g (0.013 mole) of 4,4-dimethyl-3-thiosemicarbazide in 50 mL of absolute ethanol was treated with 2.1 g (0.013 mole) of ethyl 2-chloroacetoacetate added at a rapid rate under nitrogen atmosphere. The reaction mixture turned yellow immediately, cleared, became cloudy and finally became a clear orange solution within 5 minutes. The reaction mixture was stirred at ambient temperature for ~72 hr, heated to reflux, filtered hot, and concentrated in vacuo to give a yellow oil which solidified. Trituration with benzene gave 3 g of tan solid. After 3 recrystallizations from benzene, 1.8 g of fine pale beige crystalline product was obtained, mp 135°-139° C. After drying at 98° C. under reduced pressure for 3 hr, mp 137-139° C. Analysis: Calculated for C9H16ClN3O2 : C, 46.26; H, 6.90; N, 17.98. Found: C, 46.05; H, 6.91; N, 18.09.

Provenance & Evidence