The best replacement for pocl3 is socl2.

The best alternatives to pocl3 are rated as following:
★★★★★  socl2
★★★  h2so4

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Speaking about pocl3, one probably shouldn't forget about amide.

Other search terms related to pocl3 and their ratings are:
★★★★★ amide
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pocl3
socl2
h2so4