Síntesis de fenilacetona (P2P) a partir de benzaldehído con butanona

William D.

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No, será una ruta diferente. Acetoxi sólo con ácido peracético.
 

mewnmewamine

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No it is also acetoxy
 

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Fenster

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Voy a probar esta síntesis con dicloro-metano (DCM). No veo que esto sea un problema, sólo que será más pesado que el agua. ¿Hay alguna razón para no utilizar DCM y cloroformo sintético?
 

mewnmewamine

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Bisulfite adduct is easier and produces a higher purity
 

Fenster

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Condensación aldólica.

Las instrucciones se encuentran en Reacciones orgánicas.



Este escrito parece estar más en línea con lo que estoy viendo. ¿Alguien ha intentado realmente extraer con disolvente de la capa orgánica. El uso de cloroformo no funcionará, ya que es miscible con la capa orgánica. A menos que me esté perdiendo algo la escritura necesita ser probado y modificado.

¿Alguien ha probado antes este sintetizador?
 

TheNut22

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DE ACUERDO. Calienta el benz-hido y el MEK con ácido clorhídrico unas 3-5 horas. Temperatura: 90-110 C.
Dame las gracias. :)
 
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chema12

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Hola amigó...podría ayudarme con la cintesis..tengo ese producto..
Me gustaría q me ayudara a cintetisar mi p2p apartir de benzaldehido
 

TheNut22

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10 g de benzaldehído + 24 g de MEK + 28 g de ácido clorhídrico (~20%) = 28 g de cristales, secados en una placa de pirex = 13 g de cristales.
No te compliques. Cuando hayas terminado de calentar, extrae la capa orgánica marrón. Lavar con 40 ml de agua. Extraer de nuevo. Poner 20 ml:s de solución de KOH al 10%. Elimina el agua. Comprueba el pH. Si es demasiado ácido, o demasiado básico, ponlo a 7. Vuelva a eliminar el agua. Póngalo en el congelador, porque entonces, cuando se congela, puede verter la mierda aceitosa de distancia, y obtener cristales casi blancos. Pon los cristales en un plato de pyrex, o algo asi y secalo. Se puede licuar, pero no hay problema. Solo calienta, congela, calienta, congela, secas esos cristales, pero no pueden quedar crujientemente secos. No se por que. Tal vez son sólo así.
 
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TheNut22

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Pero hay algo extraño. Cuando no mido el nivel de pH en absoluto, y sólo pongo esos cristales blancos en mi matraz de medición en el congelador, obtengo el doble de cantidad de cristales blancos puros. Hoy, hice casi la misma cantidad de reactivos, y de la misma manera, PERO titulé el nivel de pH a 7, obtuve sólo la mitad de los cristales. Creo que hay algo en esto. Ahora por la noche acabo de poner esos 20 ml:s de cristales en el congelador, ¡y son de color naranja! la mitad parece que podría obtener sólo aceite, pero acabo de comprobar que hay algún tipo de reacción entre la solución naranja y la capa superior de cristales blancos que han aparecido en unos 10 minutos. He llegado a la conclusión de que cuando se hace el aldol con ácido y se obtienen cristales básicos y no se valora para nada el nivel de pH, se obtiene el doble o el triple de cantidad de Metilfenilbutenona, y cuando se pasa la noche en el congelador, se vierte el aceite en la capa superior, y ya está. Así que, a partir de ahora, no recomiendo la valoración a nivel de pH.

P.D Lo siento, he hecho un poco de Methcathinone hoy y estoy muy cansado, así que lo siento por el texto poco claro.
Ahora me voy a dormir.
 
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chema12

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Me podrías ayudar con la cintesis..xfa
 

Kodey

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Can 3-methyl-4-phenyl-3-buten-2-one be distilled without vacuum?
 

waltjr5858

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Lol it turned to some bad stuff without vac... I went on to the next step the next time with some minor cleaning and no distillation....I didn't clean up till the end with steam distillation... works fine... yield still plenty good enough. I hate the way that stuff vac distilled......
 

Kodey

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Yk vacuum distillation is some kind of demon creation thing
 

waltjr5858

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Yup so it wasn't just me... thought I screwed something up but it's pretty easy at that point HA. I've now gotten through the entire thing and just doing a steam distillation at the end and it turns out perfectly every time. Although it took some tries to get there.
 

chem lover

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Can i use 35% H2O2 instead of 50%?
 

Chemtrail

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Synthesis of benzaldehyde
 

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mewnmewamine

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Too much GAA use maybe 1.6lish

Hydrolysis is too long in my exp
1.25eq base and 2hrs worked best for me

you didnt get 50% peroxide and attempt this 💀 will d scale up no testing time again

Purification via methylphenylbutanones bisulfite adduct is so much superior (same with p2p) both for not having to make chloroforms sake and end purity

huge excess of mek? Intentional? also amino acids r a better cat than hcl for the aldol and id use perborate for the villiger as thats higher yielding in my exp than H2O2. Percarbonate is less good getting maybe 35% but much easier and not watched at all
 

lalalander

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I'm considering purifying P2P using bisulfite, but I've read many times that the recovery is low. What is the yield after re-liberating it from the bisulfite adduct?
 
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mewnmewamine

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80s and 90s just try not to have much water in solution as bisulfite adducts are annoyingly slightly soluble in them :3
 

mewnmewamine

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Oh wait! U can salt it out too cos its only a tiny bit soluble
 

lalalander

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Does MPB form a bisulfite adduct? No matter how many times I tried, I wasn’t successful. I tried with water, and with a methanol-water mixture. It just doesn’t work.
 

lalalander

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The suspected P2P adduct was left to dry on the filter. Right now, its texture is indistinguishable from that of a mica-based eyeshadow — it looks exactly like it. Like phenylacetic acid. Is this normal?
 

nokospp

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is this route can be scaled down ?
 

mewnmewamine

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Things essentially always work scaled down its scaling up where things go wrong you should be good :3
 
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