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Great workup, thanks for sharing. Been do this type of reduction twice, first exactly like the writeup ephedrine firs followed by h3po2 then iodine and its really intense reaction. Reflux for 6 hours and only get about 33% yield. The second is i make the hi first in boiling flask by mixing...

yes i also think there is some impurities in. I put the flashlight on and it looked like a little glossy rainbow on it. and after a some research , i think this is pvp from pill binder. Because i extact the pseudo from pill washed twice with acetone , and just react it without futher...

yes i also think there is some impurities in. I put the flashlight on and it looked like a little glossy rainbow on it. and after a some research , i think this is pvp from pill binder. Because i extact the pseudo from pill washed twice with acetone , and just react it without futher...

thanks for your reply, will give it a try soon. And i had another question, does meth crystal hygroscopic ? I put mine in filter paper in and open air for air drying, but after 2 days its doesnt even dry yet. still look wet and sticky

any tips for drying crystall without oven or desicator chamber ?