Re: ORGLIST: Removal of DMF

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Message: 2
Date: Mon, 25 Jun 2007 11:41:45 +1000
From: "Christopher Luus" <cluu0433$##$mail.usyd.edu.au>
Subject: ORGLIST: Removal of DMF.
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Can anyone recommend an effective way of removing DMF from a crude
reaction
mixture? We have tried evaporation at high temperatures and low pressure
using a rotovap to no avail. 

Any suggestions would be greatly appreciated.

Thanks in advance,
Christopher Luus.
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Message: 3
Date: Mon, 25 Jun 2007 12:16:19 +1000
From: Richard Prankerd <Richard.Prankerd$##$vcp.monash.edu.au>
Subject: Re: ORGLIST: Removal of DMF.
To: Christopher Luus <cluu0433$##$mail.usyd.edu.au>,
	everybody$##$orglist.net
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	<89907EA1DCFB7548A431C13A270F9DD501660C8F$##$prk-exch-01.vcp.local>
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Christopher:
DMF can be removed with a rotovap, if the following precautions are
taken: (a) the seal around the rotating shaft must be checked and
freshly sealed with good quality vacuum grease; (b) vacuum must be from
a mechanical pump in good condition, pulling < 0.5 mmHg; (c) the
rotating flask must be heated to over 100 deg C; (d) the receiver must
be cooled with ice water.
Removal can still be slow.
Richard
-----Original Message-----
From: everybody-bounces$##$orglist.net on behalf of Christopher Luus
Sent: Mon 6/25/2007 11:41 AM
To: everybody$##$orglist.net
Subject: ORGLIST: Removal of DMF.

Can anyone recommend an effective way of removing DMF from a crude
reaction
mixture? We have tried evaporation at high temperatures and low pressure
using a rotovap to no avail. 

Any suggestions would be greatly appreciated.

Thanks in advance,
Christopher Luus.
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Message: 4
Date: Mon, 25 Jun 2007 07:47:03 +0200
From: "samarium Steiner" <neptunium$##$gmx.net>
Subject: ORGLIST: looking for a japanese scientist
To: everybody$##$orglist.net
Message-ID: <20070625054703.267100$##$gmx.net>
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Dear all
I am looking for a japanese scientist, preferably a chemist, who could
help me translating a paper. I have a very old paper written in japanese
from the journal "Yakugaku Zasshi" from the 19th century. It concerns
the isolation of some natral ingredients and probably some chemical
reactions thereof. 
I do not need an exact translation of the whole paper but I need to know
whether there is mentioned a certain compound. The database SciFinder
does not go back so early in the citations of Yakugaku zasshi.
Thank you very much,
samarium
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Message: 5
Date: Mon, 25 Jun 2007 09:21:10 +0200
From: "Ohad Ilovich" <ilovich$##$pob.huji.ac.il>
Subject: Re: ORGLIST: Removal of DMF.
To: <everybody$##$orglist.net>
Message-ID: <000e01c7b6f9$67d93ab0$0e33a8c0$##$CYCLO14>
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I've done it in two ways:
1) use an oil pump which gives better vacuum on the rotovap. if you
don't have one though it'll be costly to buy one
2) dilute the reaction with water (approx. ten times the volume of DMF
you have) and then extract the organic material with DCM or EtOAc or
whatever you usually use
Good luck,
Ohad
  ----- Original Message ----- 
  From: Christopher Luus 
  To: everybody$##$orglist.net 
  Sent: Monday, June 25, 2007 3:41 AM
  Subject: ORGLIST: Removal of DMF.
  Can anyone recommend an effective way of removing DMF from a crude
reaction mixture? We have tried evaporation at high temperatures and low
pressure using a rotovap to no avail. 

  Any suggestions would be greatly appreciated.

  Thanks in advance,
  Christopher Luus.
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Message: 6
Date: Mon, 25 Jun 2007 12:16:41 +0900 (JST)
From: "Michael Engel" <mkengel$##$gmail.com>
Subject: Re: ORGLIST: Removal of DMF.
To: everybody$##$orglist.net
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<1034739.56129.XAMJXAlJE1M=.1182741401.squirrel$##$webmailer.hosteurope.de>

Content-Type: text/plain;charset=iso-2022-jp
> Can anyone recommend an effective way of removing DMF from a crude
> reaction
> mixture? We have tried evaporation at high temperatures and low
pressure
> using a rotovap to no avail.
Is adding the mixture to water an option ?
Cheers
Michael
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