Structural formula S=P(OH)3. P adopts sp3 hybridization and has tetrahedral structure. Used for preparing organophosphorus pesticides. This substance is bound to have a strong unpleasant smell and strong reducibility. Some drugs are derivatives of it. I saw it the other day. There is a kind of S=P(C2H4N)3[C2H4N is aziridinyl] called datipa, which is an anticancer drug. It can be seen that thiophosphoric acid is of great use in drug synthesis. The idea of synthesis with S=P(OH)3 is as follows:
2S = P(OH)3+3s OCL 2-& gt； S=PCl3+3H20+3SO2
s = PC L3+C2H5N-& gt； S=P(C2H4N)3+3HCl
How about chlorine reacting with P2S5 and then hydrolyzing it? Detection: Acidify first, and yellow turbidity indicates sulfur. After filtration, proper amount of hydrogen peroxide is added first, and ammonium molybdate is added after a few minutes. If a yellow precipitate can be formed, it means that there is phosphate, so it can be inferred that the original is thiophosphoric acid. This substance is absolutely unstable. The storage method is similar to that of sodium thiosulfate, and it is sealed from light. Prevent acidification and oxidation.