Intermediate
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1,4-Phthalaldehyde
Add 6.0 g of sodium sulfide, 2.7 g of sulfur powder, 5 g of sodium hydroxide and 60 ml of water into a 250 ml three necked flask with reflux condenser and stirring device, and raise the temperature to 80 ℃ under stirring. The Yellow sulfur powder dissolves, and the solution turns red. After refluxing for 1 h, dark red sodium polysulfide solution is obtained.
