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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handle

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lalalander

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Todo el mundo dice que este método tiene defectos. ¿Alguien ha obtenido realmente rendimientos significativos con este método?
 

Ortist

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He utilizado este método muchas veces. Modificado un poco. Los mejores resultados que obtuve fueron 30 ml de P2P a partir de 100 ml de benzaldehído. También conozco algunas personas que investigaron mucho esta reacción; sus mejores resultados fueron alrededor de 35ml de P2P.

Método de trabajo:

1. Metil-fenil-butenona preparada como sigue: Se mezclan 500ml de benzaldehído con 1000ml de MEK. La mezcla se enfría en una cuba llena de hielo hasta unos +5 grados.
2. A esto se le añade HCL acuoso, 35-37%, (hay que añadir 100g de HCL puro lo que corresponde a unos 286ml de HCL al 37%)
3. Se mezcla y se guarda en un cubo con hielo toda la noche, dejar que el hielo se derrita.
4. Esperar 24 horas más
5. Ponerlo en un embudo separador, desechar la capa inferior.
6. Lavar la mezcla marrón oscuro-rojo con 500ml de agua, desechar el agua.
7. Destilar todo lo que hierva por debajo de 150 grados a presión atmosférica y desechar.
8. 8. Destilar el resto al vacío para obtener un aceite amarillo.

Este aceite se oscurecerá al reposar en una semana.


Bayer-Villiger:
1. 100ml del aceite preparado anteriormente se añaden a la mezcla de 300ml de ácido acético glacial y 100ml de peróxido de hidrógeno al 50%.
2. Calentar y remover a 55 grados.
3. Cuando empiece la reacción, la temperatura subirá por encima de 55..60 (aproximadamente 1..2 horas): esta es la indicación para APAGAR la calefacción. Si la temperatura sube a 70 grados, enfríe un poco el matraz bajo el grifo.
4. 4. Remueva hasta que la temperatura vuelva a bajar a 50..55 grados, entonces vuelva a encender la calefacción.
5. 6. Remover y calentar durante 6 horas
7. Verter la mezcla en 1L de agua, extraer 3 veces con 100+100+100ml de DCM
8. Destilar DCM


Saponificación:
1. Poner el producto Bayer-Villiger del paso anterior en un matraz con agitación. Añadir lentamente
solución de NaOH (30 g de NaOH, 250 ml de agua, 250 ml de etanol). Lentamente significa gota a gota, unas 3..5 gotas por segundo. La mezcla adquiere un color rojo anaranjado

2. Al final de la adición el pH debe ser superior a 12
3. A la mezcla añadir ácido acético (cualquier porcentaje) hasta pH neutro. La mezcla se volverá amarilla
4. Verter esto en 1L de agua y extraer 3 veces con 100+100+100ml de DCM
5. Destilar el DCM y las trazas de etanol a presión atmosférica
6. Destilar el P2P al vacío.
7. Quedará mucho alquitrán en el matraz
 
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RainbowChemical

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I just wanted to point out that there are new studies done about this. The more MEK that is used the less byproducts that are formed. In the study I read they used a ratio of 1 to 6 (1 benzaldehyde to 6 MEK) but when they increased this amount to 8 times and 10 times all byproducts disappeared
 

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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chema12

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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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