kendi kendine 2b4m sentezi için güzel ve etkili rota (kg başına ortalama 50 usd)

Dr. MMX

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Hey ben sadece wise choice tarafından kullanılan reaktifleri yazacağım (fiyat / çaba) avrupa'da satın almak için aviable
yani 1.
Elementel Sülfürlü PCL5 > tiyonil klorür

tiyonil klorür + propiyonik asit > priopiyonil klorür

4mp sentezi (burada bir konu var, bu yüzden sadece bağlantı vereceğim):
Propiyonil klorür
Toluen
AlCl3 susuz

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


bazılarının brominasyon sorunu var
Hbr elde etmek için gerekli olan sülfürik asit biraz pahalıdır ve genellikle mevcut değildir. Bunun yerine şunları kullanırız:
Reaksiyon için fosforik asit ve NaBh > HBR elde ederiz
H2O2 %12 satın alınabilir ve %25-30 gibi bir orana kadar damıtılabilir

Yani
4 metilopropiyon + HBR + h2o2 > 2b4m :)

maliyeti hesaplamadım ama çok küçük ve sevkiyatı beklemeye veya düşük kaliteli öncülden şaşırmaya gerek yok
 
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chost

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HBR'nin nasıl yapıldığını daha ayrıntılı olarak açıklayabilir misiniz?
 

Dr. MMX

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Hata yaptığım için gerçekten özür dilerim. Doğru:
Fosforik asit (H₃PO₄) ve sodyum bromürden (NaBr) hidrobromik asit (HBr) üretmek için çift yer değiştirme reaksiyonu kullanabilirsiniz. Reaksiyon aşağıdaki gibi gösterilebilir:


  1. Reaktifler: Fosforik asit (H₃PO₄) ve sodyum bromür (NaBr).
  2. Ürünler: Hidrobromik asit (HBr) ve sodyum fosfat (Na₃PO₄).

Reaksiyon için dengeli kimyasal denklem şöyledir:


H3PO4+3NaBr→3HBr+Na3PO4


Bu reaksiyonda fosforik asit, sodyum bromür ile reaksiyona girerek hidrobromik asit ve sodyum fosfat üretir.
 
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chost

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Distilasyon gerekli mi?
Ve sodyum bromürü ne kadar suda çözmeliyim?
 

Dr. MMX

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Temelde gaz olan bir şeyi başka türlü nasıl elde etmeyi planlıyorsunuz? :)

Hangi yüzdeye sahip olmak istediğinize bağlı, hatırladığım kadarıyla maksimum %47 ve zaten bu şekilde olmalı
 

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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HBr üretmek için NaBr ile H3po4? Bir dakika içinde bunu deneyeceğim.

Elimde bol miktarda HBr var, ancak ikisinin reaksiyona girip girmediğini merak ediyorum.
 

Dr. MMX

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evet ve Na3PO4
 

Dr. MMX

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Bu harika
 
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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.
 

TheVacuumGuy

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Show me what's wrong then. I used these figures with success. note that hydrogen peroxide is a solution of 35%.
 

TheVacuumGuy

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i stated roughly , not stoicimeticly


reactants Coeff Molar Mass Moles (g/mol)Weight (g)
C10H12O1
148.20168
0,67100
HBr 180.911940,6754,595831842122166
H2O2134.014680,6722,951615663196257

products
1
C10H11BrO1227.097740.67153,23560434672535
H2O218.015281,3524,311843158593074

HBr 48% = 8.77 mol/L => for required 0.67m corresponds to 0,0764L (76ml)
h2o2 35% = 11.63 mol/L => for required 0.67m corresponds to 0,0576L (57ml)

Yes that's a bit off from 100 and 50, but these numbers are theoretically, which almost never applies in practice. ( like a mephedrone synthesis is given methylamine x2 but theoretically only needs x1/5 )

furthermore excess reagents are neutralized afterwards.
 
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William Dampier

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Therefore, it is better to control the bromination visually in the reaction of the bromine, because the quality of reagents (especially chinese) can be different. 4mp purity rarely exceeds 95%.
 

w2x3f5

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The best solution is the preliminary titration of 4MP, then it will be possible to use the correction factor for 4MP
 
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