Rută plăcută și eficientă pentru auto-sinteza 2b4m (avg 50 usd a kg)

Dr. MMX

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Hei, voi tasta doar reactivi utilizați de alegerea înțeleaptă (preț / efort) care pot fi cumpărați în Europa
deci primul
PCL5 cu sulf elementar > clorură de tionil

clorură de tionil + acid propionic > clorură de priopionil

4mp sinteză (aici este un topicso ill just link):
Clorură de propionil
Toluen
AlCl3 anhidru

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


unele persoane pot avea probleme cu brominarea acestuia
acid sulfuric necesar pentru a obține Hbr, care este un pic scump și nu este adesea disponibil. În schimb folosim:
acid fosforic și NaBh pentru reacție > obținem HBR
H2O2 12% poate fi cumpărat și distilat la un procent mai mare de 25-30%

Deci
4 metilpropionă + HBR + H2O2 > 2b4m :)

Nu am calculat costul, dar este foarte mic și nu este nevoie să așteptați expedierea sau să fiți surprinși de un precursor de calitate scăzută
 
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chost

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puteți explica mai detaliat cum se face HBR?
 

Dr. MMX

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Îmi pare foarte rău că am făcut o greșeală. Este corect:
Pentru a produce acid hidrobromic (HBr) din acid fosforic (H₃PO₄) și bromură de sodiu (NaBr), puteți utiliza o reacție de dublă deplasare. Reacția poate fi reprezentată după cum urmează:


  1. Reactivi: Acid fosforic (H₃PO₄) și bromură de sodiu (NaBr).
  2. Produse: Acid hidrobromic (HBr) și fosfat de sodiu (Na₃PO₄).

Ecuația chimică echilibrată pentru reacție este


H3PO4+3NaBr→3HBr+Na3PO4


În această reacție, acidul fosforic reacționează cu bromura de sodiu pentru a produce acid hidrobromic și fosfat de sodiu.
 
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chost

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Este necesară distilarea?
Și în câtă apă ar trebui să dizolv bromura de sodiu?
 

Dr. MMX

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Cum altfel intenționați să obțineți un lucru care este în esență un gaz? :)

Depinde ce % vrei să ai, maximul este 47% din câte îmi amintesc și ar trebui să fie deja în acest fel
 

Benz88

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

Dr. MMX

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TheVacuumGuy

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H3po4 cu NaBr pentru a produce HBr? Voi încerca acest lucru într-un minut.

Am mult HBr, dar sunt curios dacă cele 2 reacționează.
 

Dr. MMX

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da și Na3PO4
 

Dr. MMX

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este minunat
 
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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
 

Dr. MMX

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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).
 

Dr. MMX

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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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