I have been thinking a lot lately about why the quality of different batches are so different of mephedrone, because I don't think it is cut like coke or heroin because it is cheap to produce, it can be made simply from chemical materials, so there must be another reason. First the Chinese produced from 4-methylpropiophenone which made the rushy mephy feeling, I bought a lot around 2010, and It was always the same, no mistake. Now that after China banned producing 4-methylpropiophenone which contains up to 10% 3-methylpropiophenone sounds bullshit, because that would mean that China banned less pure than 90% 4-methylpropiophenone, because 3-methylpropiophenone is considered as impurity. 4-methylpropiophenone is clearly still available from China. Also if they would consider the 4-methylpropiophenone which contains 10+% 3-methylpropiophenone as a better componud to make mephedrone of it, they would have used 100% 3-methylpropiophenone which would produce 3-MMC which is not potent at all, we know it. Now that China stopped and Indians started produce Mephedrone I am not sure why (but probably because it is much easier and requires less chemical tools) they started producing it from 4-methylephedrine. 4-methylephedrine is available in 2 enantiomeric form, so If the production company starts to synth Mephedrone form (R)-4-methylephedrine, it will be structurally 4-MMC, but a very weak version of it and if they produce from (S)-4-methylephedrine it will be a potent kick-ass Mephedrone. (Chinese Mephedrone was racemic 50-50%(RS).) I think this is the logical answer of why there are weak batches and nice batches, because there is no other differences in the two synthesis.
It would be great if anyone who is experienced in chemistry could confirm or deny it. If I am true I think producing (R)-4-MMC is one of the largest felony against the humanity was ever done. What a waste ! Those Indians should know this ! Everyone deserves great mephedrone, like water or fresh air !
I hope this is not against the rules, as I didn't write any process of synthesis, only 2 compounds which is necessary, to understand my theory.