Synthesis of Methamphetamine from P2P and NaBH4 Reduction

[ImRegistered]

Why is isopropyl added to methylamine+meoh? I have not seen the use of this solvent in other similar write ups
(Link in above post)

 

[G.Patton]

Because it's needed to redissolve methylamine in IPA. It's a better option in compare with my write up cuz it allows to get rid of water and increase yield.

 

[Heligo554]

Assuming you inadvertently add too much NaBH4 at once and the temperature rises to 30C, is there any way to save it or do you have to restart in any case?
Yes I know I'm a complete idiot... I added another 300ml of IPA to dilute everything again and now it looks like at least something is happening again.

 

[G.Patton]

You need to avoid such temperature fluctuations cuz it reduces yield significantly. You can continue this batch. It's worth to get something instead of nothing.

 

[Amin. M]

Thank you for your efforts
How to turn the final product into a crystal?

 

[Grubby]

I have not successfully made amphetamine. I would like to ask the master. Why can't we directly distill the product with the boiling point of free amphetamine after the NaBH4 reduction reaction is completed? I want to know the principle.