BK4 (2b4m) Containing 4-methylpropihenon

[HIGGS BOSSON]

Describe the synthesis technique you used.
Who is the supplier?
In appearance, BK4 powder looks clean. And small amounts of methylpropiophenone should not lead to such results.

 

[w2x3f5]

I check with him. Standard 50 grams bk4+350 dcm+methylamine 40% 100 ml, 2 hours mixed, control temp 30 degrees.
In him 100 gr bk4 have around 15 ml methylpropiophenon, its not good. And washing in hot water not helped, maybe recristallyzation helps

 

[w2x3f5]

You upset me. The methylamine is washed out with high quality, the acid was used less than half of the theoretically required amount, the acid was added very slowly, with acetone it turns out blue shit (he already wrote with a photo in another post). If you take bk4 and melt it, it melts at approximately 56-60 degrees, but the author does not have the technical ability to melt the sample in a capillary as it should be done. But we all know perfectly well that the melt of bk4 in water should sink (for memory 1.4 g/ml), since its density is much higher than water (1 g/ml), and the density of the MP is 0.991 g/ml

 

[G.Patton]

I guess I can overcome it

 

[G.Patton]

4-methylpropiophenone has 238-239 7 °C melting point, BK4 has 75-77 °C melting point. You said that this product has 56-60 °C. Do you understand that it have to melt at higher temperature, not lower?

 

[w2x3f5]

Y self checked BK4 has 75-77 °C ? 4-mp 238 its boiling point, you wrong

 

[w2x3f5]

Do you understand that the unpurified product melts lower for everyone? Do you understand that bk4 manufacturers do not purify it and do not recrystallize it

 

[G.Patton]

It is false. Product can be polluted by substances with higer mp. As you suppose in this case, it is 4-methylpropiophenone. Hence, mp of bk4 have to rise.
I don't know about this product any. As I understand, neither you. You have just assumptions. I would like to continue this discussion with topic author.

 

[w2x3f5]

And the last moment, the author used water at 70 degrees (thermostat with a temperature sensor) and everything melted. Even according to your data, there is a problem with bk4

 

[w2x3f5]

MP is a liquid under normal conditions, you write that it melts at 238 degrees

 

[w2x3f5]

BK4 will not rise, the density of its melt is more than 1 gram per milliliter))) your DCM does not rise to the top layer in pure water?)))

 

[G.Patton]

Yes, you are right. My bad. Temperature have to down. Anyway, 4-BK may be recrystallized from benzene with slight warm.

 

[w2x3f5]

no need benzene, for author its hazard, IPA best variant, I think work same great same like with p2np

 

[white7proton]

Can someone help explain how I can clean the 2B4M so that it doesn't make my mix go black when I add acid.

I'm trying my best to liase with the seller, if you or someone can help with a method to fix / clean the 2B4M I have then I will be happy with that, I just want to fix it so I can finally finish my synthesis.

Or, you can do step by step with me, I will show photos and videos etc and do the whole process and show you that what I am saying is the truth. Please guys.

 

[sierraleone]

I'm sure the reason that you are getting black liquid is that you are adding acid too fast.
It must be added dropwise,very slowly while stirring vigorously.If you think you added it slowly do it even slower.

 

[G.Patton]

Okay, take it easy, man. You didn't mentioned about 2l water =/ I just want to help, ok?

 

[w2x3f5]

Problem with BK4, please just check him photo and can see much mp because oil layer up (mp 0.991 gram/ml). Its seller problem

 

[w2x3f5]

prove if much MeNH2, if low yes y right

 

[G.Patton]

I asked about melting point, not about its density. Do you know about this chemical analysis method? It can help you to determine purity of substance indirectly. Also, I'm sure that problem not with BK4. Probably something wrong with acid or acetone.
Sorry, I don't understand your statement

 

[w2x3f5]

I think this question we closed, because problem with bk4. About chemistry we can talking in pm )

 

[w2x3f5]

Another person has the same problem and contacted me. The seller is the same, the goods are the same and the problem is exactly the same. I hope the site administration will take action against the seller of low-quality goods to resolve the problem.

 

[mocnykutas]

Made your self u get good

 

[w2x3f5]

you should not advertise the sale of your product without the permission of the administration, on other sites they will be banned for this

 

[w2x3f5]

Bro of course I do self, I not buy bk4, read good this topic )))
Its people buy from one seller in this board...