PCl5 + [X] → POCl3 is one of the product. [X] can be :
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PCl5 + BCl3 —→ PCl4+ BCl4–
PCl5 + R2POOH —→ R2POCl
PCl5 + H2O —→ POCl3
PCl5 + P4O10 —→ POCl3