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Good day, thank you for your help, everything worked out for me, the whole problem, as I understand it, was in ethyl acetate after its complete spoilage and dilution with dry acetone, I was re-acidified and then the salts fell out.

Good evening, excuse me, can I ask you for help? I made a synthesis of Alfa pvp based on this recipe https://bbforum.eu/tags/a-pyrrolidinovalerophenone I did everything as described, except for distilling ethyl acetate, I brought the acidification to 5, put it in the freezer, and the salts did...