Σύνθεση 1-φαινυλο-2-προπανόνης (P2P) από μηλονικό διαιθυλο(φαινυλακετυλο)-μαλονικό οξύ

G.Patton

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Καταλαβαίνετε την ερώτησή σας; :unsure: Εννοείτε απλή απόσταξη αντί για απόσταξη υπό κενό; Μπορείτε, οι 216 βαθμοί Κελσίου είναι το σημείο βρασμού σε κανονικές συνθήκες.
 

OrgUnikum

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Παιδιά, μην υποκύψετε στη λατρεία της ιερής παλινδρόμησης. Η παλινδρόμηση δεν έχει καμία αξία από μόνη της εκτός από την ψευδαίσθηση ότι κάτι συμβαίνει που δημιουργεί.

Με H2SO4 και οξαλικό οξύ (καλύτερο) αλλά και φωσφορικό οξύ και περίπου οποιοδήποτε οργανικό οξύ όπως οξικό ή μυρμηκικό ή κιτρικό δουλεύει κανείς παίρνει σχεδόν ποσοτικές αποδόσεις αν ζεστάνει το μίγμα αργά επί δύο ώρες στους ΟΧΙ ΠΕΡΙΣΣΟΤΕΡΟ από 95 °C, το κρατήσει εκεί για 30 λεπτά και μετά το αφήσει να κρυώσει. Προσθέστε μια μικρή ποσότητα διαλύτη εκτός από DCM (τολουόλιο, ξυλόλιο, αιθέρας), καθώς το οργανικό οξύ μπορεί να πέσει και έτσι συνιστάται η συλλογή από πάνω. Μπορεί να χρησιμοποιηθεί βενζινικός αιθέρας 40/60 και δεν χρειάζεται πολύ, αλλά στο τέλος παίρνετε ΤΡΙΑ στρώματα: Το ανώτερο στρώμα είναι πετρελαϊκός αιθέρας με διαλυμένο P2P. Το μεσαίο στρώμα είναι P2P με Pet-Ether διαλυμένο*. Και παρακάτω είναι το μείγμα οξέος (το οποίο μπορεί να επαναχρησιμοποιηθεί παρεμπιπτόντως χωρίς προβλήματα).

*Ακούγεται περίεργο, αλλά έτσι είναι: Τόσο ο Pet-αιθέρας όσο και το P2P διαλύουν το ένα το άλλο, αλλά δεν αναμιγνύονται ελεύθερα. Και έτσι έχετε τα τρία στρώματα που με τρέλαναν ήδη εδώ και πολύ καιρό. Μέχρι που κατάλαβα αυτό.......

200 g διυδρικό οξαλικό οξύ
300 ml νερό
100 ml H2SO4 37% (οξύ μπαταρίας)
Δεν διαλύεται όλο το οξαλικό οξύ - κανένα πρόβλημα.
Με αυτό μπορεί κανείς να επεξεργαστεί τουλάχιστον 200 ml κόκκινου λαδιού 20230
Χρειάζεται πραγματικά ισχυρή ανάδευση όλη την ώρα.
Το μείγμα νερού/οξέος μπορεί να επαναχρησιμοποιηθεί.
Όχι πάνω από 95 °C δίνει ανοιχτό κίτρινο P2P απευθείας χωρίς ατμό ή άλλη απόσταξη.
Όταν χρησιμοποιείς sep-funnel καλύτερα διαχωρίζεις όσο είναι ακόμα ζεστό και δεν πέφτει το οξαλικό. ή το βάζεις σε ποτήρι ζέσεως στην κατάψυξη με τον πάτο του ποτηριού να ακουμπάει στο κρύο ώστε να αρχίσει να κρυσταλλώνεται από εκεί. Αν το κάνεις αυτό δεν χρειάζεσαι καθόλου διαλύτη, το οξύ και το νερό που κρυσταλλώνεται από τον πυθμένα θα οδηγήσουν το P2P στην κορυφή και μπορείς απλά να το αδειάσεις μετά από δύο ή τρεις ώρες και ΔΕΝ θα μείνει πίσω P2P.

Έκανα πολλή δουλειά γι' αυτό, lol
 
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w2x3f5

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αναφέρετε την απόδοση της ουσίας p2p παρακαλώ.
Έχετε κόκκινο λάδι; παραδόξως, είχα κίτρινο λάδι κάτω από τον ίδιο αριθμό.
 
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Pinkbay

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Is there any other way to isolate the phenylacetic acid besides putting it in the refrigerator? Will not separating affect my future work?
 

William D.

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You can crystallize this in a cool place and filter after. In another case, you can distill the fractions. For the following steps, you cannot leave PPA.
 

Pinkbay

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Sir, how long does the PAA crystallization process take?
 

greatwhiteshark

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I would like to know if this synthesis is also working with phosphoric acid ( h3pO4) I appreciate your work and time
 

greatwhiteshark

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And what would be the amount ( phosphoric acid 85%)
 

GnarleyBarley

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Currently performing a test on the substrate with 75% phosphoric acid. No exact amounts used.
Trying with about 1:2 (Precursor to Phosphoric acid), again no exact amounts used but will report back if it works at all.
 

GnarleyBarley

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Tests using 75% phosphoric acid 1:2 (substrate to acid). 1 hour and 30 minutes into the reaction. Took a small "sniff test" and I seem to be able to detect the distinct odour of phenyl-2-propanone.
Lots of bubbling in the reaction that started as early as 60 degress celcius.

Again no exact amounts was actually used as the substrate I tried was a sample purchase from a chinese vendor (not on this site). Red liquid just like the photos of the malonate everywhere, the smell was not super pleasant but not horrible. Around 100 euro per kilo (actually less considering shipping was included)
 

GnarleyBarley

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2 hours and 23 minutes into the reaction and I can confirm 100% that 75% phosphoric acid definitely works. However the reaction is still bubbling from CO2 evolution, so the reaction is not done.
The smell of phenyl-2-propanone is now too strong to dispute. The substrate was legit.

Further experimentation needs to be done to determine optimal amount of phosphoric acid.

Previous experience: [P2NP (from benzaldehyde & nitroethane) to phenyl-2-propanone with iron powder and HCL] and [MAPA to phenyl-2-propanone with hydrochloric acid])
If I remember correctly the p2np to phenyl-2-propanone with iron powder and HCL sometimes produced phenyl-2-propanone with an acrid smell. however the smell of the phenyl-2-propanone from the malonate is extremely sweet and that of pure phenyl-2-propanone.

Will store the resulting phenyl-2-propanone as a powder by reacting it with metabisulfite.

edit: Also beware of alibaba sellers of BMK precursors, one of them was not legit. (check the bot reviews, the fake sellers strictly sell precursors and have fake reviews of GBL and synthetic cannabinoid indole derivatives)
 
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greatwhiteshark

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Appreciate your work hope we can get a detailed syntheses of phosphoric acid. I have 85% of phosphoric acid and hope to find a way that is working
 

GnarleyBarley

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Take notice: Ignore the 5 hour bullshit, it was not enough for me with 75% phosphoric acid. I ended up with way too much oil than theoretically possible. i.e. it was a mixture of the precursor and product, the precursor had not fully reacted. (I also detected the precursor smell when working up the reaction). This is a big problem according to me as they are annoying to separate from eachother. Therefor it is important, imo, to run the reaction to completion, I'd rather have bi-products or some slight polymerisation from running the reaction longer than unreacted precursor.

Better to end the reaction when it no longer is bubbling or bubbling very little.

Also don't wait for a detailed guide. Just try it yourself using small amounts.
Either use a 1:1 or 1:2 ratio of precursor to phosphoric acid. This is not that complex.
 

Chemistry lntern

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May I ask which solvent can be used instead of ether?
 

GnarleyBarley

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Use any compatible solvent, Such as DCM, MTBE etc etc.
The solvent needs to follow 2 criteria,
* Should not be too easy to hydrolyse (e.g. ethyl acetate hydrolyses in basic conditions, so if used you have to minimize it by either low % NaOH solution or be fast)
* Needs to be non polar and not misicible/soluble in water.

Preferably low boiling point so it can be removed easy later, but if that is not a concern for you
you also got things like toluene

I currently use an ether but not diethyl.
 
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Chemistry lntern

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May I ask if I can still succeed by adding 20% alkaline solution after heating and refluxing, but the pH value can only reach 7?
 

GnarleyBarley

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Sorry you have to be clearer in your writing mate.
An alkaline solution can never be below 7, alkaline is just chemistry speech for "basic" (i.e. above 7 on the pH scale)

Why is it important for you too not go below 7? (or above 7)?

Please tell me which reaction and chemicals you intend or are currently using. You doing the sulfuric acid variant, phosphoric acid or saponification + hydrochloric acid variant?
 

Chemistry lntern

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Heating reflux for 5 hours, adding 20% sodium hydroxide solution to the ice bath, the pH value is stuck at 7
 

GnarleyBarley

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Assume you meant you added the alkaline to the reaction mixture while it's in a ice bath. Anyway if the pH value is stuck at 7, your pH meter or pH paper doesn't work correctly. What are you using to measure the pH?

And what acid did you use?

Edit:
The first guy who replied to this thread said the following (note the pH thing with the saponification or whatever)
"Perform CAS 20320-59-6 official procedure After 4 hours of reaction at 80°C, stop heating, then adjust the alkali pH with sodium hydroxide, until 7, it can't go up, stratification appears, the oil layer is on top, and then ether extraction is added, and the stratification begins, and the ether layer is extracted, and the upper layer starts, and the distillation at atmospheric pressure at 220° keeps going up, and the temperature keeps it at 110°, and a lot of liquid is distilled, and I think it's ether, and then it starts to appear, and this phenomenon in the flask I thought it would be 216° distillation to produce P2P, but there is no problem How can I remedy it "
 
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