is this the way it is?
5000 ml three-neck, flat-bottomed flasks. placed in an ice bath and placed on a magnetic stirrer. We install a reflux condenser cooled with running water, a dropper with a pressure compensator and a thermometer.
In the flask we put 70 gr. NaBH4 dissolved in a mixture of 300 ml water and 700 ml IPA.
We drop a solution of 108 gr. P2NP in 200 ml. IPA through an addition funnel, at such a rate that the temperature of the reaction mixture does not rise above 5 degrees.
After adding all the propene in the flask, a white slurry with insoluble borates formed in the flask, cool the mixture to 0 degrees and slowly add 300 mL. chilled 85% acetic acid, keeping the temperature in the flask no higher than 3 degrees. When all the acetic acid has been added, the borates should dissolve and the solution should take on a yellowish beige hue.
We fall asleep in a flask with one portion of 270 gr. zinc dust and add 800 ml through the funnel. 38% hydrochloric acid in the amount of about 50-60 ml. in a minute. Then leave the mixture to stir for 2 hours.
The precipitate is additionally filtered by washing it on the filter with 2-3 portions of IPA, 20-30 ml each. the filtrate must be completely transparent. If there are any foreign inclusions, solid particles, filter again.
Add cooled 50% NaOH aqueous solution to the filtrate until a layer of yellowish oil comes to the surface, which will be separated, and the aqueous layer is washed 3-4 times with 100 ml. IPS. Combine the separated oil and alcohol extracts, add 50 gr. finely ground sodium sulfate, cool the mixture below 0 degrees and hold at this temperature for 2-3 hours. Then the mixture is filtered, the precipitate is washed on the filter 1-2 times with 50 ml. anhydrous IPS.
Add 200 ml to the filtrate. anhydrous acetone, put the mixture on a stirrer and add 96% sulfuric acid dropwise until the acidity of the mixture reaches 5.5 - 6. Already during the addition, a precipitate forms, it is necessary to stir the mixture throughout the volume. If mixing is difficult, a little anhydrous acetone can be added.
After reaching the required acidity, the precipitate is filtered, washed on the filter with a small amount of acetone until completely white and dried in air (or batteries) to constant weight. We get 100 + -10 gr. d,l-amphetamine sulfate.
If necessary, solvents can be distilled from the filtrate, the precipitate can be dissolved in 30-50 ml. anhydrous acetone and get another 5-15 g of the substance. However, these residues are quite dirty and will take a long time to wash through the filter, and recrystallization from an ethanol-water system may be necessary to achieve the same purity as the original product.