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are you referring to the first step of the synthesis? if you are failing with conversion of amphetamine salt to freebase you need to learn basic chemistry skills. try an organic chemistry textbook as well as a practical/experimental organic chemistry guidebook.

Unfortunately I still do not understand from the picture how the structure (3) is generated from amphetamine and formaldehyde reaction. Your picture shows methylamine attacking acetone, which is much more analogous to the formation of the phenylacetone-methylamine imine than what I believe to be...

As you said, I cannot see the final product of the mechanism because of the logo on the picture, but it looks like the double bond is formed between the N and Carbon C1 from the mechanism diagram. If my guess about the picture is correct, then the picture you've given supports my hypothesis that...

@G.Patton I believe one of the drawn intermediates on this synthesis (and from the original rhodium article) is incorrect. (3), the representation of the amphetamine-formaldehyde imine intermediate possesses the same structure as the phenylacetone-methylamine imine that can be seen elsewhere...