Syntéza fenylacetonu (P2P) z benzaldehydu s butanonem

William D.

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Ne, bude to jiná cesta. Acetoxy pouze s kyselinou peroctovou.
 

mewnmewamine

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No it is also acetoxy
 

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Fenster

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Chystám se vyzkoušet tuto syntézu s dichlormethanem (DCM). Nevidím v tom problém, pouze to, že bude těžší než voda. Existuje nějaký důvod, proč nepoužít snadno dostupný DCM a syntézu chloroformem?
 

mewnmewamine

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Bisulfite adduct is easier and produces a higher purity
 

Fenster

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Aldolová kondenzace.

Pokyny pro tuto metodu jsou v části Organické reakce



Tento zápis se zdá být více v souladu s tím, co vidím. Zkoušel někdo skutečně extrahovat rozpouštědlem z organické vrstvy. Použití chloroformu nebude fungovat, protože je mísitelný s organickou vrstvou. Pokud mi něco neuniklo, je třeba zápis vyzkoušet a upravit.

Zkoušel už někdo tento syntetizátor.
 

TheNut22

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V POŘÁDKU. Stačí zahřívat benzohydy a MEK s kyselinou chlorovodíkovou asi 3-5 hodin. Teplota: 90-110 C.
Jen mi poděkujte. :)
 
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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
 

handle

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TheNut22

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10 g benzaldehydu + 24 g MEK + 28 g hydrok.kyseliny (~20%) = 28 g krystalů, sušených v pyrexové misce = 13 g krystalů.
Zůstaňte u jednoduchého postupu. Po skončení zahřívání extrahujte hnědou organickou vrstvu. Propláchněte 40 ml vody. Znovu extrahujte. Přidejte 20 ml:s 10% roztoku KOH. Zbavte se vody. Zkontrolujte pH. Pokud je příliš kyselé nebo příliš zásadité, nastavte ho na 7. Znovu se zbavte vody. Dejte to do mrazáku, protože pak můžete po zmrznutí vylít mastný sajrajt a získat téměř bílé krystaly. Krystalky dejte do pyrexové misky nebo něčeho podobného a vysušte je. Může to zkapalnět, ale není to problém. Prostě zahřívej, zmrazuj, zahřívej, zmrazuj, ty krystalky vysušíš, ale nemůžou být křupavě suché. Nevím proč. Možná jsou prostě takové.
 
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TheNut22

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Je tu však jedna zvláštnost. Když vůbec neměřím hladinu pH a jen dám ty bílé krystalky do odměrné baňky v mrazáku, získám dvojnásobné množství čistě bílých krystalků. Dnes jsem si připravila téměř stejné množství činidel a stejným způsobem, ALE titrovala jsem hladinu pH na 7, dostala jsem jen polovinu krystalů. Myslím, že na tom něco bude. Teď večer jsem dal těch 20 ml krystalů do mrazáku a jsou oranžové! polovina vypadá, že by mohla dostat jen olej, ale právě jsem si ověřil, že probíhá nějaká reakce mezi oranžovým roztokem a horní vrstvou bílých krystalů, které se objevily asi za 10 minut. Dospěl jsem k závěru, že když uděláte aldol s kyselinou a dostanete zásadité krystaly a vůbec netitrujete pH, dostanete dvojnásobné nebo trojnásobné množství methylfenylbutenonu, a když je to přes noc v mrazáku, vylijete olej do horní vrstvy a je to. Takže od této chvíle nedoporučuji titraci hladiny pH.

P.S Omlouvám se, dneska jsem dělal Methcathinone a jsem strašně unavený, tak se omlouvám za nepřehledný text.
Jdu teď spát.
 
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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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