Hi all.
  I was looking further into that reaction since time ago,,but seems not much info about concret methods.
  All info on the web talks about how happens hepatic transesterification of methylphenidate to ethylphenidate when ingested  last one with alcohol(ethanol),but never saw the inverse conversion on any recipe.
 From what i know until date,..following some article,basic will consist on that one pot method:
 
methylphenidate HCL-------------------------------ritalinic acid-----------------------------ethylphenidate HCL
                                      Hydrolized with HCL                       esterified with Ethanol+HCL

I supossed,the inverse reaction can be also easy ,but who knows.treating on last step ritanilic acid with methanolic hcl to get racemic methylphenidate seems to much easy.
I was thinking  on something as simple as refluxing the ethylphenidate on minimum amount acidic methanol,reducing methanol amount at the end and  go with an  acetone flash...or simply evaporation after refluxing too...
Well,my questions it´s simply,...how can one performs that conversion...and most important,what kind of yields can one expect from that reaction?
  Ethylphenidate it isn´t cheap,..like 30$ 2 grams.Cheaper on bulk sure.
  But i´m a real fan of methylphenidate to some situations where other drugs are too strong or too weak...and of course ,it isn´t easy to get on gram quanties because legal problems.
I tested several times the ethylphenidate and it´s not for me at all.There is much info about  really some sellers are listing the really potent ethylphenidate isomer,..but lots of scams too,and anybody can guaranties the seller it´s selling  the isomer listed.
Anyway,i still prefer the methylphenidate,..and allways it´s little painfull to access  because control.
On the other side,i know sellers that list racemic ethylphenidate at verty good prices now,and can be an alternative to get methylphenidate without much legal troubles.
  Like said,i looked into esterification reactions,but don´t found a recipe how to perform it.
  I´ve found latelly that article about ethylphenidate from justice papers where talk a little about esterification process but no much.
  Any idea will be great,as allways!
  hxxp://www.justice.gov/dea/pr/microgram-journals/2011/mj8-2_58-61.pdf DO NOT LINK TO GOVERNMENT SITES
  Ethylphenidate: An Analytical Profile
 U.S. Department of Justice
Drug Enforcement Administration
Special Testing and Research Laboratory
22624 Dulles Summit Court
Dulles, VA  20166
ABSTRACT:  Spectroscopic and chromatographic data are provided for ethylphenidate, a relatively new internet-available
compound, possessing CNS stimulant properties.  Analytical data (infrared spectroscopy, mass spectrometry, and proton/carbon
nuclear magnetic resonance spectroscopy) are presented.


please no direct links always substitute some letters

I don´t know if i´m  explaing well Sedit...i didn´t made ethylphenidate...not methylphenidate.
  I was looking into transform comercial RC ethylphenidate into methylphenidate
  Much doubts are about time and mostly hcl amount.
  Like i´ve told ,i was thinking on simply refluxing the ethylphenidate with methanol on little hcl presence and then let evaporate or crystallize by cooling,..but any idea about time and hcl amount.
 

I don´t know if i´m  explaing well Sedit...i didn´t made ethylphenidate...not methylphenidate.
  I was looking into transform comercial RC ethylphenidate into methylphenidate
  Much doubts are about time and mostly hcl amount.
  Like i´ve told ,i was thinking on simply refluxing the ethylphenidate with methanol on little hcl presence and then let evaporate or crystallize by cooling,..but any idea about time and hcl amount.
 

I understand exactly what your saying. Its hydrolysis of the Ethylphenidate to get to ritalinic acid and then esterfy it using MeOH/HCl. A very minor grasp of basic chemistry goes a long way here Sassa.

i understood from the begining was almost a stupid question/thread to start...but didn´t expect so much  .
   Ritalinic acid it´s hardly available on the web...too,prices of suppliers are not interesting at all vs. ethylphenidate from what i saw.

  I was allways talking about snorting the esters...not oral consumption...that never made on me anything usefull or interesting.The oral effects vs. snorted effects are so extremly different that almost it´s like talking about 2 different drugs.

I´m still on the idea pure snorted methylphenidate it´s a great clean/social stimulant...and it  can get really  strong and fine at not very high doses...I think lots people don´t know how good can be if snorted pure...sure much people are thinking on oral pills effects...But sure each consumer  like/dislikes different highs,....

Finally..racemic ethylphenidate samples i was able to got from 2 differents suppliers ,i felt it really weak,hard on the nose,short duration,...nothing interesting comparable(to me) to pure methyl ester.Still to me one of the best clean stimulants available.,and much better than 90% street coke here,for example..but each ones.... .
 
  Have seen too...when first time ethylphenidate was introduced on legal market...much people thought about that hepathic trassterification of methyl ester when ingested with alcohol, resulting on a way more harder and pleassurable effect...thinking that ethylphenidate would  be the way to go...From what i´ve read latelly..that conversion of methylphenidate to ethylphenidate it´s marginal...and latelly,..people talking about  that much stronger effects of the methyl ester when combined with alcohol are impossible to be induced by so low ethylphenidate amounts on blood,..and too..that the transesterification only works on one of the isomers of the methyl ester...resulting on only one isomer of the ethyl ester formed....i supossed that one some seller claims to sell and supossed the only SNC active....
   

Sorry its off topic but its had me curious for a long time now....

Can you smoke the freebase just like you can with Cocaine since they share similar pharmacology? I have tried with Methylphenidate and it appeared there was some activity but starting with a pure product was near impossible due to the time release binders they put in the pills themselves.

Aah yes smoking methylphenidate, think they call it "kitty crack" and it does work

The carboxylic acid will go into a (aq)basic solution and stay there where as the ester should remain as an oil or precipitate for non polar extraction.

Reflux your carboxylic acid in MeOH/HCl solution and allow to evaporate. Wash this with 5% NaOH solution and extract with DCM(emulsion could form due to Na cations) or other non polar solvent and precipitate ester as the amine salt using HCl or other suitable acid.

This is all rather trivial basic highschool chemistry Sassa.

well...thank´s sedit about all advises..i was looking into something more direct,but sure nothing can be as easy as i was thinking...more than easy,..so straight forward as dessired
  I experimented with refluxing half gram on methanol with some drops 37% HCL 30 minutes.,and then have let evaporate.Snorted the final stuff after cleaning it...and with no testing on hand..pretty sure was still ethylphenidate...posisbly some conversión to methyl ester,i felt minimal stronger effect than plain ethylphenidate,but almost anything...
  Because that,i was asking so much about hcl amount...no much idea i need a very strong acidic methanol to hydrolize de ethyl ester first and then,what conversion yields i will expect.
Sure i was reading a lot ,and not be able to figure it out exactly.
  Go into basic water first was something i was not looking out.
That so basic things are that remin me how little chemistry basics i have .But sure i read and read and read,..but when on other methods i felt it really easy to go practical,..here i can´t see the light at the end 
 
Sincerily,i was looking into a "one pot method" to take a bunch of ethyl ester and converting to the methyl ester without much work.,with not much matter if resulting stuff it´s contamined with other ester..
About isopropil-/ethyl-/methyl- esters,,i´ve noticed when used hot IPA to extract pills,,the stuff it´s stronger than plain water extractions or methanol extractions... but i was thinking was about the stuff from IPA extraction comes white as hell,,,lot purer than extracting with water,or methanol,but really effect seemed stronger.It´s known the isopropil ester as better?(ethylphenidate it´s sure all ther,but methyl it isn´t so free available)
  I will think then on advises from sedit to perform something that can work without too much work,
  Thank´s all
  Bye

Thanks Sedit ... already knew about basic chemistry was a retard but always fortunate to have somebody that can remember that somettimes ...
i understand the fatigue ... but not the ways ... I think on this forum always introduced myself as someone who had no great knowledge of chemistry, but declined tsure to be included in the group of people that throw questions in the air throwing without having bothered to review all available information.I´m not that kind of guy,and you know it.
Is how it works ... the theoretical Sedit, but nothing worth me without a practical application.
    My field is genetics, and to more specifically molecular biology and biotecnology, .You can be surprised,but can know anything about mapping genes and not much how works a basic esterification.It´s crude reality.On other hand,I'm tired of seeing people learning theory for months and then not knowing how to begin in the laboratory,
Anyway, I do not get angry,,,, I like too ,uch this forum and the people who form it  to take it seriously, or something .. but if I am saw by someone almost as a parasite that does not spend a minute in learning . Sorry to be so blunt, but I thought it´s really bad taste.
I guess you know my contributions to this forum, and always introducing me as someone with serious deficiencies in basic chemistry, I have been involved in processes almost blind, and I'm sure that at least someone will benefit from my experiences .
Do not take me for what I am not Sedit.
I understand your role here, I respect you like one of the most relevant people here, but I can´t understand your indignation and innecesary irony.
    On the topic, I tested the baic  hydrolysis process with heat, extraction with toluene , then I reduced the mixture until complete evaporation and then I put it to reflux in methanol with HCl and then evaporate and heat to clean.
I gotI  nothing.
never mind, it's my way of learning.
Of course I read all the literature available at this time about the esterification of methylphenidate, ethylphenidate and esters in general.
Thank´s