trevlig och effektiv väg för själv 2b4m syntehsis (avg 50 usd per kg)

Dr. MMX

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Hej, jag ska bara skriva reagenser som används av klokt val (pris / ansträngning) som kan köpas i Europa
så 1st
PCL5 med elementärt svavel > tionylklorid

tionylklorid + propionsyra> priopionyklklorid

4mp-syntes (här är ett ämne så ill bara länk):
Propionylklorid
Toluen
AlCl3 vattenfri

http://bbzzzsvqcrqtki6umym6itiixfhni37ybtt7mkbjyxn2pgllzxf2qgyd.onion/en/threads/synthesis-of-4-methylpropiophenone-from-toluene-by-friedel-crafts-reaction-1kg-scale.209/


vissapplecan har problem med att brominera det
svavelsyra som är nödvändig för att få Hbr som är lite dyrt och inte ofta tillgängligt. Istället använder vi:
fosforsyra och NaBh för reaktoin > vi får HBR
H2O2 12% kan köpas och destilleras till några fler% som 25-30%


4 metylopropion + HBR + h2o2 > 2b4m :)

jag beräknade inte kostnaden men mycket liten och inget behov av att vänta på leverans eller bli förvånad över prekursor av låg kvalitet
 
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chost

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Kan du förklara mer i detalj hur man gör HBR?
 

Dr. MMX

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Åh, jag är verkligen ledsen att jag gjorde fel. det är korrekt:
För att producera bromvätesyra (HBr) från fosforsyra (H₃PO₄) och natriumbromid (NaBr) kan du använda en dubbel förskjutningsreaktion. Reaktionen kan beskrivas på följande sätt:


  1. Reaktanter: Fosforsyra (H₃PO₄) och natriumbromid (NaBr).
  2. Produkter: Bromvätesyra (HBr) och natriumfosfat (Na₃PO₄).

Den balanserade kemiska ekvationen för reaktionen är:


H3PO4+3NaBr→3HBr+Na3PO4


I denna reaktion reagerar fosforsyra med natriumbromid för att producera bromvätesyra och natriumfosfat.
 
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chost

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Är destillering nödvändigt?
Och i hur mycket vatten ska jag lösa upp natriumbromiden?
 

Dr. MMX

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Hur ska man annars få ut något som i princip är en gas? :)

Det beror på vilken % du vill ha, max är 47% som jag minns och det borde redan vara på detta sätt
 

Benz88

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is it Safe to Distille the h2o2 to maybe 30-35% from 12%?
 

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TheVacuumGuy

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H3po4 med NaBr för att producera HBr? Ska prova detta om en minut.

Har gott om HBr, men är bara nyfiken på om de 2 reagerar.
 

Dr. MMX

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ja och Na3PO4
 

Dr. MMX

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det är underbart
 
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TheVacuumGuy

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Didn't work. I think it would be easier to add sulfuric acid to a solution of KBr (or NaBr) , which would readily yield HBr at 125c
 

Dr. MMX

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I tried to override having sulfuric acid becasue here is troubles to get it. It was very extreme attempt
if there is access to sulfuric acid its easy job
 

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you can get elemental bromine from potasium bromide, dont need to use acids.
it was quite cheap as i remember
 

Toddler

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Hbr2 48% can work ?
(CAS.No: 10035-10-6)

how much ration use for bromination
Hbr2
H2O2
for 100g of 4MPP
 
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w2x3f5

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Instead of propionyl chloride, can use propionic anhydride (obtain phosphorus oxide from propionic acid), can also use propionic acid directly with polyphosphoric acid (there are many options for this reaction, you can choose the best one). If propionyl chloride is used with anhydrous aluminum chloride (can be replaced with cheaper and simpler options). Then it is best to carry out a bromination reaction before hydrolysis in Fridel-Crafts (the complex of 2b4m and aluminum chloride is very active for bromination with a high yield).
 

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In chemistry trade buissness in europe propionic acid is considered with "silent restriction" with reason it can be used as biological weapon, so should be avoided there.

very interesting choice of propionic anhydride
 

Osmosis Vanderwaal

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@TheVacuumGuy you gave him bad figures and he used them and probably ruined 100G 2B4-MP. I dont know what he paid, but I got $200 all day for 10g if it's domestic . In th rules there are a few gold nuggets. "Use the fucking search engine." That's a rule. Another one is " a good chemist i an accurate chemist." Make sure that you clearly state you are guessing when you don't know. You could say nothing at all, you could show your math or you could tell him he needs to figure it himself, but please, dont just throw out random numbers, with no disclaimer.
 
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