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Also, it has come to my attention that one of the chemical diagrams was wrong: it's a small thing, but the double bond on the imine intermediate (produced from the norpropylhexedrine and formaldehyde) should be on the nitrogen's other bond...it is a METHYLimine after all!
And check out @chemdelic for more awesome chemistry content, including his unique approach to getting nitroethane:
https://www.youtube.com/watch?v=G-poNCUViqY
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WARNING: while completely legal and VERY SAFE when used as directed, you should NOT take propylhexedrine recreationally. Its effects are fairly weak compared to related chemicals, and it comes with a variety of unpleasant side effects (high blood pressure, stress, nausea/vomiting, and even psychosis). The chemicals used in this synthesis also pose their own unique risks...many are toxic (especially mercury and formaldehyde), and the rest are either flammable or corrosive. Given the exceptionally low yield, questionable purity, high cost, and near-impossibility of obtaining the necessary reagents, I cannot recommend trying this at home.
0:00 Intro
1:00 Introducing: propylhexedrine
1:43 First attempt
4:11 Sponsored segment
6:15 New pathway, new ingredients
7:05 The Henry reaction
8:59 Problems arise
9:48 Nitropropene reduction
11:39 Norpropylhexedrine workup
13:02 Freebasing: did the reaction work??
14:05 Reductive amination to propylhexedrine
17:02 Propylhexedrine?
19:03 Final yield
19:57 Testing the product