From: Darren Rhodes (drhodes$##$globalnet.co.uk)
Date: Sun Aug 11 2002 - 10:07:42 EDT
A couple of UK companies (Production Techniques Ltd, 13 Kings Road, Fleet,
Hampshire, Enlgand GU13 9AU tel 01252 616757 facs 01252 615818 and Cowie
Technology tel 01642 599190 facs 01642 596810) should be able to supply you
with suitable PTFE vessels.
Does anyone know the name and contact number of the people in Jenna
(Germany) who are currently using lab scale microwave reactors????
Darren.
----- Original Message -----
From: "Jacob Zabicky" <zabicky$##$bgumail.bgu.ac.il>
To: "Darren Rhodes" <drhodes$##$globalnet.co.uk>;
<suzukicar$##$belais.freesurf.fr>; <everybody$##$orglist.net>; "Jacob Zabicky"
<zabicky$##$bgumail.bgu.ac.il>
Sent: Sunday, August 11, 2002 6:51 AM
Subject: Re: ORGLIST:Bromination
> Hello again,
>
> If we come to microwave reactors, as Darren suggested, ultrasound is also
> a possibility. IMO in both cases you will need a specially designed
vessel,
> both to allow inflow of energy to the reaction mixture and to avoid
outflow
> if the deletereous bromine vapors.
>
> All the best,
>
> Jacob
>
> At 13:15 8/8/2, Darren Rhodes wrote:
> >It would be interesting to this sort of thing under microwave conditions
...
> >This should bring down your reaction time and if you wanted to do the
work
> >on a larger scale you could use a continuous flow microwave reactor ...
For
> >the batch microwave work talk to http://www.personalchemistry.com/ (the
web
> >page seems a bit bloated but it should give you contact details). For
the
> >continuous flow ... maybe the personalchemistry people again ??? Perhaps
> >someone else on the list could give appropriate details and refs and
perhaps
> >their own experiences of these techniques .....
> >
> >Darren.
> >
> >----- Original Message -----
> >From: "Jacob Zabicky" <zabicky$##$bgumail.bgu.ac.il>
> >To: <suzukicar$##$belais.freesurf.fr>; <everybody$##$orglist.net>
> >Sent: Thursday, August 08, 2002 12:32 PM
> >Subject: Re: ORGLIST:Bromination
> >
> >
> >Hello Bel,
> >
> >The pressure in the vessel will be somewhat lower than 4 bar. If your
> >reaction mixture is over a couple of mL, you should carry out the process
> >in a Teflon-lined pressure vessel. If you can do it in small batches,
> >then you can prepare thick-walled test tubes, of outer diameter not
bigger
> >than say 10 mm, place your mixture, freeze it with ice-salt or other
> >cooling medium (below -10C), and seal the tubes while slightly evacuating
> >at the end.
> >
> >You can place the tubes in boiling water or in a temperature-controlled
> >heating block, all this, of course in a well protected hood. Thick-walled
> >tubes of small diameter withold some pressure quite well.
> >
> >Good luck,
> >
> >Jacob
> >
> >
> >At 16:23 7/8/2, Bel wrote:
> >>Dear all,
> >>
> >>I would like to know If any has experience with bromination in harsh
> >>conditions, using sealed tube at high temperature. I found one procedure
> >>concerning the bromination of an electronically poor aromatic
(pyridinium
> >>derivative) which must be done by heating during 3 days at 180C. The
> >>bromine's boiling point is 58.7C, which means a very high pressure in
the
> >>tube at 180C. So does anyone know how to make such reaction in a safe
way,
> >>and which kind of tube may resist to such pressure?
> >>
> >>Regards
> >>
> >>Bel
> >>
> >>
> >>
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> >Institutes for Applied Research
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> >
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> Prof. Jacob Zabicky
> Institutes for Applied Research
> Ben-Gurion University of the Negev Private: POB 12366, Beer-Sheva
84863
> POB 653, Beer-Sheva 84105, ISRAEL Tel. +972-8-6496792
> http://profiler.bgu.ac.il/site/main.cfm
> Tel. +972-8-6461271/6461062/6472754
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>
>
>
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