[gpcr1949]

Agreed the process is very simple. The innovation that makes the resolution worth it is (as Derek also mentioned in the blog post) an efficient way to re-racemize the L-meth to DL-meth, which can then be resolved again. With steady state production and pooling this means it can be done using just one batch size (and not ever smaller "brsm" style bathces). If these steps are efficient enough you definitely get much more bang for your buck. Here is one such method[0] which probably inspired these drug manufacturers (as they use thioglycol and AIBN, which has been found in clandestine lab seizures).

[0] https://sci-hub.se/10.1021/jo061033l (published in JOC in 2006 - so only a mere 2 decades behind the curve)

[gavinray]

Oh wow, now this is interesting.

To ELI5 this, what the commenter is saying is that you can take the "useless" L-Meth, and convert it to racemic, mixed D/L Meth.

Which you can then perform a second resolution step on, to convert/purify further, to the opposite chirality and get D-Meth.

The very interesting thing about this (if I were a clandestine chemist, or someone who wanted to get high at home), is that:

- AIBN is a readily available reagent, it's not difficult to acquire or would put you on any lists. This is in comparison to much of what you need for other synthesis techniques

- You can buy L-Meth legally over the counter. The extraction process would be a bit of a mess (quite literally) but should be doable, some basic recrystallization and/or conversion to freebase.

[hinoki]

To further ELI5, racemic means a mixture of left handed (Dextrorotatory) and right handed (Laevorotatory) versions of the same compound. Some molecules can have two different shapes that are mirror images of each other, and these different shapes can interact differently with our biology.

In this case, the right handed version is available in stores with no prescription, while the left handed version is a very controlled substance.