ORGLIST: RE: Everybody Digest, Vol 19, Issue 7

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Message: 5
Date: Thu, 9 Mar 2006 08:38:44 -0500
From: "Ilya Avrutov" <IAvrutov$##$dalton.com>
Subject: RE: ORGLIST: Separation of mixtures
To: "fine chem" <chemicals555$##$yahoo.com>, <everybody$##$orglist.net>
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Message: 6
Date: Thu, 9 Mar 2006 11:35:01 -0300 (BRT)
From: diogo$##$unilavras.edu.br
Subject: ORGLIST: nitroarene reduction
To: everybody$##$orglist.net
Message-ID:
	<2359.150.164.110.75.1141914901.squirrel$##$webmail.unilavras.edu.br>
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Hi, everybody!
There4s been a long time since I4m trying to reduce some nitro derivatives
of vanillin. we aren4t able to do it by catalytic hydrigenation since we
don4t have the reagent and apparatus. But I4ve been searching some methods
in literature and I4m quite envolved with borohydride-transition metal
nitro reduction. Besides reducting the nitro group and the formyl group
(also present in the molecule) there have been many other byproducts, I
guees degradation. I would appreciate if you could sugest ways to overcome
this and get the pure aromatic amino and maybe even not the reducted
formyl group. other reduction systems are quite welcome.
Diogo
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Message: 7
Date: Thu, 09 Mar 2006 18:01:01 +0300
From: "bijster bagger" <bijster_bagger$##$hotmail.com>
Subject: ORGLIST: R'-OH --> R'-NH-R"
To: everybody$##$orglist.net
Message-ID: <BAY22-F685675B470E6314EE0889F5EC0$##$phx.gbl>
Content-Type: text/plain; format=flowed
Dear fellow chemists,
I've been trying to convert an alcohol to a secundairy amine, and found the
following in Vogel (5th ed), p. 779:
"A similar ammonolysis of alcohols in the prescence of certain metallic
oxide catalysts is, however, extensively used on the large scale for the
manufacture of all classes of amines."
This refers to the following condensation reaction :
R'-OH + R"-NH2 --> R'-NH-R" + H2O
Further searching did not yield any more information about this process. Can
anybody suggest which metallic oxide catalyst can be used, and under which
process conditions? And, if at all possible, supply me with some references?
Thanks in advance,
Reni
The Netherlands
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Message: 8
Date: Thu, 9 Mar 2006 09:00:13 -0800 (PST)
From: Sengen Sun <sengensun$##$yahoo.com>
Subject: Re: ORGLIST: Seperation of nitro compounds
To: everybody$##$orglist.net
Message-ID: <20060309170013.49836.qmail$##$web53712.mail.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
I recrystalized my nitration products from ethanol. I
did lot of this kind of reactions about 20 years ago.
Good luck.
Sengen
--- srinivas reddy <gounisrinivas$##$yahoo.com> wrote:
> Hi,
>
> can anybody help me on how to seperate the mixture
> of
> aromatic nitro compounds that are formed by
> nitration
> with HNO3/H2SO4?. I tried with column chromatography
> but of not much use.
>
> thanks in davance
>
> GSR
>
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End of Everybody Digest, Vol 19, Issue 7
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