Author Topic: benzo wacker run  (Read 122 times)

igotthere

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benzo wacker run
« on: November 25, 2012, 01:09:40 AM »
Hi all,

Just thought I'd share a  benzo wack story.

200g oil + 80g Meoh
110g benzo
2g Pd
400g Meoh
25ml Dh20

Benzo was going to be 100g but it was a litle dull in colour so it was raised slightly. Still its  not much compared to MM's numbers
Pd was raised  slightly due to less Benzo

Everything went  in a 2l rb flask with condensor, bar the oil+80mg Meoh.

Medium spin.

Dripped in the oil over around 50-60mins.

No heat evolution to talk of, maybe ever so slightly.

Once all the oil was added it was heated to a nice reflux for around 8-10 hrs - maybe 2 drips or so per second.

Cooled off, hit with Naoh then extracted three times with 500, 250, 100ml DCM

Washed the dcm with 1 bicarb, 1 Nacl, 4 or 5 water.

Distilled off the dcm at atmos (forgot to use drying agent before distilling... whoops..)

Set up for vac distil of ketone (fridge pump.. i know iknow..)

Think a little water came over (it was clear - was thrown)

Then maybe some safrole at  around 120deg (not a lot -was removed and set aside)

Then around 145-150 ish the yummy stuff appeared, all the way to 175ish

every now and then there would be a slight change in tone from the pump, and then a little flurry of activity in the form of ketone.

This sort of continued until the end.

Haven't weighed it but in all 150ml was collected.

Nice yellowy neon green Ketone with a multicolored prism like refreaction when a HI LED was  shone through.

Bingo.

IGT










pygmalion

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Re: benzo wacker run
« Reply #1 on: November 30, 2012, 12:43:02 AM »
It takes more effort (read: careful fractional distillation. Very careful!) to separate the isosafrole from the ketone. I used to run it at the kg stage with 10 g PdCl and get like 1300g back! It took a lot of work, and distilling at a lower vacuum than I liked to separate the byproducts, which were predominantly isosafrole, what i assumed was piperonal, and some weird shit I had no way to identify.

After this clean up I was still left with around 800g of beautiful ketone. Sometimes more, sometimes less. It was odd, sometimes it looked like antifreeze, bright, and sometimes almost entirely colorless. Mmmm that smell. . .


How did it work out for you?

igotthere

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Re: benzo wacker run
« Reply #2 on: December 01, 2012, 03:48:16 PM »
Hi P,

wow! 1kg runs? thats big...

tell me about the workup at those levels- and what sort of kit do you need to run 1kg? what did you wash/extract with etc?

I haven't got to distilling my ketone/iso yet as I'm concentrating my (precious) time on jons route.

I did weigh it though and its 118g so am thinking 70% ketone?

igt