Re: ORGLIST: Regarding Silica Gel

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From: Julie Locke (jlocke$##$uow.edu.au)
Date: Sun Dec 07 2008 - 16:15:20 EST


Dear Penny,

I think you need to go to a finer filter method to remove the silica. I had
a similar problem when purifying some acids and found that (on a small
scale) the silica could be removed by dissolving the compound in using a
syringe tip filter like that used for HPLC samples. Good Luck.

Dr Julie M Locke
Research Fellow
ARC Centre of Excellence for Electromaterials Science
University of Wollongong
 

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Today's Topics:

   1. Re: Regarding Silica Gel (marut shah)

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Message: 1
Date: Sun, 7 Dec 2008 00:21:49 +0530
From: marut shah <marutshah5$##$hotmail.com>
Subject: Re: ORGLIST: Regarding Silica Gel
To: <everybody$##$orglist.net>
Message-ID: <COL109-W2755CC683A04FBC0687BA497FF0$##$phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"

Dear Penny
I am of the opinion that basic alumina with column chromatography will solve
your problem.
Why not try?
Marut shah> From: everybody-request$##$orglist.net> Subject: Everybody Digest,
Vol 54, Issue 3> To: everybody$##$orglist.net> Date: Sat, 6 Dec 2008 12:00:04
-0500> > Send Everybody mailing list submissions to> everybody$##$orglist.net>
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When replying, please edit your Subject line so it is more specific> than
"Re: Contents of Everybody digest..."> > > Today's Topics:> > 1. Acraldehyde
(Jyoti Agarwal)> 2. Regarding Silica Gel (shailesh patel m)> > >
----------------------------------------------------------------------> >
Message: 1> Date: Fri, 5 Dec 2008 21:42:26 +0530> From: "Jyoti Agarwal"
<jyotiagarwa$##$gmail.com>> Subject: ORGLIST: Acraldehyde> To:
everybody$##$orglist.net> Message-ID:> <29dc46070812050812
q16a73e7dl22117bab54e35bcd$##$mail.gmail.com>> Content-Type: text/plain;
charset="iso-8859-1"> > Hello Everybody,> > I'm looking for acaldehyde for
my reactions. can somebody tell me a good> source for this chemical in
*India** *or any suitable method to synthesize> it in lab? Bcoz I am unable
to get this from Sigma Aldrich in INDIA.> > > > Thanks in advance.> > > With
best regards> > Jyoti Agarwal> > India> -------------- next part
--------------> An HTML attachment was scrubbed...> URL:
<http://two.pairlist.net/pipermail/everybody/attachments/20081205/404544e1/a
ttachment.html>> > ------------------------------> > Message: 2> Date: 6 Dec
2008 13:26:20 -0000> From: "shailesh patel m" <shailptl$##$rediffmail.com>>
Subject: ORGLIST: Regarding Silica Gel> To: everybody$##$orglist.net> Cc:
everybody-request$##$orglist.net> Message-ID:
<20081206132620.4990.qmail$##$f4mail-234-247.rediffmail.com>> Content-Type:
text/plain; charset="iso-8859-1"> > Dear Penny,> Regarding Silica Gel
problem, I supp ose you are using Silica Gel GF254. Can you please try
avoiding Methanol in your experiment. I don't have any idea regarding nature
of your compound but it might be too basic which demands very polar solvent
like methanol to leach you compound from silica. In this case just try using
DCM-Triethylamine(5%) mixture. Just soak you compound containing silica in
DCM-TEA mixture for half an hour and filter with sintered funnel or even
whattman paper will not be problem. Sometimes Ethanol will also help any
using any other thing but never use methanol to leach compound from
preparative silica.> > Hope this helps. > > Shailesh Patel> > > > On Fri, 05
Dec 2008 everybody-request$##$orglist.net wrote :> >Send Everybody mailing list
submissions to> > everybody$##$orglist.net> >> >To subscribe or unsubscribe via
the World Wide Web, visit> >
http://two.pairlist.net/mailman/listinfo/everybody> >or, via email, send a
message with subject or body 'help' to> > everybody-request$##$orglist.net> >>
>You
  can reach the person managing the list at> > everybody-owner$##$orglist.net>
>> >When replying, please edit your Subject line so it is more specific>
>than "Re: Contents of Everybody digest..."> >> >> >Today's Topics:> >> > 1.
Acraldehyde (Jyoti Agarwal)> > 2. purification (penny joshi)> > 3. Re:
looking compound (ling huang)> > 4. Re: looking compound (Ilya Avrutov)> >
5. Re: purification (Amir Mahmoudkhani)> >> >>
>----------------------------------------------------------------------> >>
>Message: 1> >Date: Thu, 4 Dec 2008 23:58:38 +0530> > From: "Jyoti Agarwal"
<jyotiagarwa$##$gmail.com>> >Subject: ORGLIST: Acraldehyde> >To:
everybody$##$orglist.net> >Message-ID:> >
<29dc46070812041028g74131e34kc2e03806e9339eba$##$mail.gmail.com>>
>Content-Type: text/plain; charset="iso-8859-1"> >> >Hello Everybody,> >>
>I'm looking for acaldehyde for my reactions. can somebody tell me a good>
>source for this chemical in *India*? Bcoz I am enable to get this from
Sigma> >Aldrich in INDIA.> >> >> > > >Thanks in advance.> >> >> >With best
regards> >> >Jyoti Agarwal> >> >India> >-------------- next part
--------------> >An HTML attachment was scrubbed...> >URL:
<http://two.pairlist.net/pipermail/everybody/attachments/20081204/1da86161/a
ttachment.htm>> >> >------------------------------> >> >Message: 2> >Date:
Thu, 4 Dec 2008 17:03:24 -0500> > From: "penny joshi"
<penny.joshi$##$gmail.com>> >Subject: ORGLIST: purification> >To:
everybody$##$orglist.net> >Message-ID:> >
<983977360812041403u1a9b986crbf2f04f0d6fa5552$##$mail.gmail.com>>
>Content-Type: text/plain; charset="iso-8859-1"> >> >I have a problem
regarding purification of my compounds. I am purifying them> >by using
peparative plates and get my compound out of silica by dissolving> >in 10-20
%MeOH/DCM. but at this polarity silica fines also come so later i> >dissove
it in DCM and then filter it through buckner funnel using watman> >filter
paper one and a layer of sodium sulfate but still i cannot get rid of>
>silica fines.> >and i have tried this around 5-6 times with little
modifications> >I need some suggestions> >thanks> >-------------- next part
--------------> >An HTML attachment was scrubbed...> >URL:
<http://two.pairlist.net/pipermail/everybody/attachments/20081204/44155286/a
ttachment-0001.html>> >> >------------------------------> >> >Message: 3>
>Date: Thu, 4 Dec 2008 22:25:39 -0800 (PST)> > From: ling huang
<ling.huang$##$prodigy.net>> >Subject: Re: ORGLIST: looking compound> >To:
everybody$##$orglist.net> >Message-ID:
<725758.1531.qm$##$web83816.mail.sp1.yahoo.com>> >Content-Type: text/plain;
charset="iso-8859-1"> >> >?> >Hi Uno,> >???????????? Try:> >?>
>http://www.chemindustry.com/apps/chemicals?m=s&t=9,10-Dicyanoanthracene>
>?> >http://www.chemindustry.com/?lists distributors and lots of useful
links for the pharma and biotech industry. Scientific equipment, lab
supplies, software, newsletter etc.> >?> >Regards,> >?> >Ling> >?> >Ling
Huang> >Chemistry Department> >Sacramento City College>
>http://www.scc.losrios.edu> >http://www.OChemTechOnline.com> >> > From: Uno
M'?eorg> >Subject: ORGLIST: looking compound> >To: everybody$##$orglist.net>
>Date: Tuesday, December 2, 2008, 11:23 PM> >> >Dear colleagues,> >> >I'm
looking for 9,10 dicyanoanthracene as sensitizer for oxidation of> >alkyl
groups at aromatic rings.> >> >Can somebody tell me a good source for this
chemical?> >> >With best regards> >> >Uno> >>
>_______________________________________________> >ORGLIST - Organic
Chemistry Mailing List> >Website / Archive / FAQ: http://www.orglist.net>
>To post a message (TO EVERYBODY) send to everybody$##$orglist.net> >To
unsubscribe, send to everybody-request$##$orglist.net the message: unsubscribe>
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<http://two.pairlist.net/pipermail/everybody/attachments/20081204/f5e9184e/a
ttachment-0001.htm>> >> >------------------------------> >> >Message: 4>
>Date: Fr i, 5 Dec 2008 09:17:47 -0500> > From: "Ilya Avrutov"
<IAvrutov$##$dalton.com>> >Subject: Re: ORGLIST: looking compound> >To:
<ling.huang$##$prodigy.net>, <everybody$##$orglist.net>> >Message-ID:> >
<3C4E01DBE4138446A742AC296B57F30D0120048D$##$dalton-es.dalton.dcl>>
>Content-Type: text/plain; charset="iso-8859-1"> >> >For chemicals suppliers
search you can use also free online sites:> >www.chemexper.com>
>www.emolecules.com> >> >Best,> >Ilya Avrutov, PhD> >Process Development
Team Leader> >Dalton Pharma Services> >349 Wildcat Rd., Toronto, ON> >M3J
2S3 Canada> >> >________________________________> >> > From:
everybody-bounces$##$orglist.net [mailto:everybody-bounces$##$orglist.net] On
Behalf Of ling huang> >Sent: Friday, December 05, 2008 1:26 AM> >To:
everybody$##$orglist.net> >Subject: Re: ORGLIST: looking compound> >> >> >> >Hi
Uno,> > Try:> >>
>http://www.chemindustry.com/apps/chemicals?m=s&t=9,10-Dicyanoanthracene> >>
>http://www.chemindustry.com/ lists distributors and lots of useful links
for the pharma and biotech industry. Scientific equipment, lab supplies,
software, newsletter etc.> >> >Regards,> >> >Ling> >> >Ling Huang>
>Chemistry Department> >Sacramento City College> >http://www.scc.losrios.edu
<http://www.scc.losrios.edu/>> >http://www.OChemTechOnline.com
<http://www.ochemtechonline.com/>> >> > From: Uno M'?eorg> >Subject:
ORGLIST: looking compound> >To: everybody$##$orglist.net> >Date: Tuesday,
December 2, 2008, 11:23 PM> >> >> > Dear colleagues,> >> > I'm looking for
9,10 dicyanoanthracene as sensitizer for oxidation of> > alkyl groups at
aromatic rings.> >> > Can somebody tell me a good source for this chemical?>
>> > With best regards> >> > Uno> >> >
_______________________________________________> > ORGLIST - Organic
Chemistry Mailing List> > Website / Archive / FAQ: http://www.orglist.net> >
To post a message (TO EVERYBODY) send to everybody$##$orglist.net> > To
unsubscribe, send to everybody-request$##$orglist.net the message: unsubscribe>
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>Date: Fri, 5 Dec 2008 08:45:23 -0700> > From: Amir Mahmoudkhani
<amirmahmoudkhani$##$hotmail.com>> >Subject: Re: ORGLIST: purification> >To:
<penny.joshi$##$gmail.com>, <everybody$##$orglist.net>> >Message-ID:
<BLU148-W4143C44BCB4D8094905623CAFE0$##$phx.gbl>> >Content-Type: text/plain;
charset="iso-8859-1"> >> >> >Penny,> >> >I would do centrifuging instead of
filtering the solution, it is easier and faster, if you have one in your
lab.Amir Mahmoudkhani> >> >> >Date: Thu, 4 Dec 2008 17:03:24 -0500From:
penny.joshi$##$gmail.comTo: everybody$##$orglist.netSubject: ORGLIST:
purification> >I have a problem regarding purification of my compounds. I am
purifying them by using peparative plates and get my compound out of silica
by dissolvin g in 10-20 %MeOH/DCM. but at this polarity silica fines also
come so later i dissove it in DCM and then filter it through buckner funnel
using watman filter paper one and a layer of sodium sulfate but still i
cannot get rid of silica fines.> >and i have tried this around 5-6 times
with little modifications> >I need some suggestions> >thanks>
>_________________________________________________________________> >>
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Issue 2> >****************************************> > > Shailesh Patel(Ph.D.
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