Synthesis of HAPTSC.2-Hydroxyacetophenone (0.1 mol dissolved
in 15 mL of methanol), thiosemicarbazide (0.1 mol dissolved in 150
mL of water), and potassium hydroxide (1 g dissolved in 10 mL of
water) were mixed in a round-bottomed flask and refluxed for 4 h and,
after cooling, was poured in ice water. The yellow crystals obtained
were washed repeatedly two or three times with ethanol and then
purified by recrystallization in ethanol.