Orglist Digest Tue, 15 Jan 2002 09: 47: 26 -0800 V01 #110 Today's topics: 'Aminomethylation of polystyrene'




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ORGLIST - Organic Chemistry Mailing List


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JANUARY – JUNE 2002


orglist Digest Wed, 09 Jan 2002 00:02:23 -0800 V01 #109

Today's topics:
'TMA/picric acid assay'
'comercial sources'

----------------------------------------------------------------------

Date: Tue, 8 Jan 2002 16:45:58 +0000 (GMT)
From: Claudia Loechel <
cl237@cam.ac.uk>
Subject: TMA/picric acid assay

Dear all,

has anyone used the "Dyer" or a related method for the determination of
trimethylamine using picric acid? According to the literature, water
interferes in this assay; I just wonder how picric acid is dried
considering the explosive nature of dry picric acid?

Thanks for your help

Claudia

------------------------------

Date: Tue, 8 Jan 2002 16:34:02 +0800 (CST)
From: yantao chen <
yantaochen@yahoo.com>
Subject: comercial sources

Dear All:

I am looking for the comercial sources for the two
organic phosphate: mono-dodecyl (dihydrogen) phosphate
(CAS: 2627-35-2) and 12-hydroxydodecyl (dihydrogen)
phosphate. Please send your information to

yanch@ifm.liu.se


Thanks in advance.

YC


------------------------------
End of orglist Digest V01 #109
******************************

orglist Digest Tue, 15 Jan 2002 09:47:26 -0800 V01 #110

Today's topics:
'Aminomethylation of polystyrene'

----------------------------------------------------------------------

Date: Sat, 12 Jan 2002 12:56:27 +0530
From: "Toyota Chemical Industries Pvt. Ltd." <
tcipltd@vsnl.com>
Subject: Aminomethylation of polystyrene

I want to add -CH2NH2 group in polystyrene in one step.
Does anyone know how this can be done using an amide?
thanks in advance.
Kumar

------------------------------
End of orglist Digest V01 #110
******************************

orglist Digest Wed, 16 Jan 2002 00:03:02 -0800 V01 #111

Today's topics:
'decarbethoxylation'

----------------------------------------------------------------------

Date: Tue, 15 Jan 2002 15:15:00 +0100
From: Giancarlo Doddi <
giancarlo.doddi@uniroma1.it>
Subject: decarbethoxylation

Dear Colleagues,
I am looking for the reaction conditions of the decarbethoxylation
of beta-ketoesters described in A. Rao, S. Lala, R.R. Rao "Indian J.
Chem., Sect. B, 23B (7), 603-10, 1984".
Can anybody help me?
Thank you in advance for your time.
Best regards

Giancarlo Doddi
Universita' di Roma "La Sapienza"
Dip. di Chimica
Box 34 Roma 62
Piazzale Aldo Moro 5
00185 Roma
tel: 0649913077
fax: 06490631
mailto:giancarlo.doddi@uniroma1.it
http://www.uniroma1.it/centricnr/csmr/

------------------------------
End of orglist Digest V01 #111
******************************

orglist Digest Thu, 17 Jan 2002 00:04:29 -0800 V01 #112

Today's topics:
'Phase-transfer catalyst query'

----------------------------------------------------------------------

Date: Tue, 15 Jan 2002 19:48:28 -0500
From: Merlin <
medchem@adelphia.net>
Subject: Phase-transfer catalyst query

Greetings. Has anyone utilized the following PTC in conjunction with
toluene?

Myristyltrimethylammonium bromide (CAS [1119-97-7])

I am a really time with trying to extract my product (in toluene), while
trying to effectively separate this PTC in water.

Tried filtering (2 micron) but no use.

Any references, ideas, etc. would be greatly appreciated.

Cheers!
--
George D. 'Merlin' McCallion

------------------------------
End of orglist Digest V01 #112
******************************

orglist Digest Fri, 18 Jan 2002 00:01:07 -0800 V01 #113

Today's topics:
'Diindolylmethane'
'hydrolysis possibility'
'Overpressure valves'
'Re: ORGLIST: Phase-transfer catalyst query'

----------------------------------------------------------------------

Date: Wed, 16 Jan 2002 18:19:00 -0600
From: "Ramanujam Prasad" <
rprasads@hotmail.com>
Subject: Diindolylmethane

I am looking for vendor for 3,3'-Diindolylmethane. Can anyone help me?

Please reply to rprasads@hotmail.com
Thanks in advance
Prasad
------------------------------

Date: Wed, 16 Jan 2002 17:03:08 +0100
From: "Yantao Chen" <
yantao@thinfilm.se>
Subject: hydrolysis possibility

Dear All:

Does any one have the information about the hydrolysis possibility of mono
phenyl phosphate and other substituted phenyl phosphates in water?

Thanks.

Regards, yantao

------------------------------

Date: Thu, 17 Jan 2002 15:42:09 +0900
From: "Michael Engel" <
michael-engel@ma.dic.co.jp>
Subject: Overpressure valves

Hello,
I am an organic chemist and, until some years ago, I used mercury valves as
an overpressure valve when doing synthesis under an inert atmosphere.
During the last years, I didn't have to use such overpressure valves.
Now I am back and I want/have to to use some other types of valves.
What do use in your country, are Hg valves still in use ?
Thanks for any advice.
Best wishes
Michael Engel
(Japan)

------------------------------

Date: Wed, 16 Jan 2002 13:44:05 +0100
From: "Jonas Nilsson" <
jonni@ifm.liu.se>
Subject: Re: ORGLIST: Phase-transfer catalyst query

I wild guess.
Percipitate the bromide with silver(I)phosphate or some other silver salt
with multiple charged anion. The ammonium phosphate formed should be less
soluble in organics than the ammonium bromide.

or

Use continous extraction apparatus to extract away the ammonium bromide.

or

Filter through silica.

/jN
__________________
Jonas Nilsson
IFM Kemi
Link=F6pings Universitet
013-285690

------------------------------
End of orglist Digest V01 #113
******************************

orglist Digest Mon, 21 Jan 2002 00:02:19 -0800 V01 #114

Today's topics:
'Re: ORGLIST: Overpressure valves'
'Re: ORGLIST: Overpressure valves'
'Re: ORGLIST: Overpressure valves'
'How to regenerate 'used' alumina'

----------------------------------------------------------------------

Date: Fri, 18 Jan 2002 12:20:11 +0530 (IST)
From: A De <
ocad@mahendra.iacs.res.in>
Subject: Re: ORGLIST: Overpressure valves

Calcutta, 18th January 2002
Why don't you try an over pressure valve with liquid paraffin.
Asish De
Professor Asish De
Dept. of Organic Chemistry
Indian Association for the Cultivation of Science
Calcutta -700 032
INDIA

------------------------------

Date: Sun, 20 Jan 2002 13:27:45 +0200
From:
zabicky@bgumail.bgu.ac.il (Jacob Zabicky)
Subject: Re: ORGLIST: Overpressure valves

Hello Michael,

You can use a non-return valve made of glass (Pyrex, Quickfit, etc.). They
are very simple and work fine, as long as you keep a slow stream of inert
gas flowing. If you need to work under pressure, the gas-supply companies
have non-return valves rated for all scales of pressure, and made of
corrosion-resistant alloys.

All the best,

Jacob
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x
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
Fax. +972-8-6472969
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x

------------------------------

Date: Thu, 17 Jan 2002 11:24:28 -0800 (PST)
From: mohsen fouad <
fouad_m_m@yahoo.com>
Subject: Re: ORGLIST: Overpressure valves

I don't know what do u need, exactly?? tell me.
A.Dr. Mohsen Fouad
bye

------------------------------

Date: Sat, 19 Jan 2002 17:33:55 +0000
From: "F.J. Lalor" <
stch8002@bureau.ucc.ie>
Subject: How to regenerate 'used' alumina

I have a quantity of alumina which has been used - quite some time
ago - to pre-dry and remove peroxides from tetrahydrofuran. Can
anyone tell me how to regenerate and whether any precautions are
necessary other than the safe removal of any volatiles. I have
access to a vacuum oven with a maximum temperature of 200 deg. C.
TIA -
Fergus Lalor
--

--------------------------------------------------
Dr. Fergus Lalor, Senior Lecturer, Chemistry Dept., University
College, Cork, IRELAND.
Telephone: 353-(0)21-902317. Fax: 353-(0)21-274097

------------------------------
End of orglist Digest V01 #114
******************************

orglist Digest Tue, 22 Jan 2002 00:01:20 -0800 V01 #115

Today's topics:
'Re: ORGLIST: Overpressure valves'
'commercial availability'

----------------------------------------------------------------------

Date: Mon, 21 Jan 2002 10:30:07 +1100
From: Richard Prankerd <
richard.prankerd@vcp.monash.edu.au>
Subject: Re: ORGLIST: Overpressure valves

Michael:

If the gas space in the system is small, then you can use a balloon filled with
the inert gas

Richard
--
Richard J. Prankerd, PhD
Senior Lecturer
Victorian College of Pharmacy, Monash University
381 Royal Pde., Parkville VIC 3052

Phone: INT+613-9903-9003
Phax: INT+613-9903-9583

Drugs need to be designed with delivery components in mind - Takeru Higuchi

------------------------------

Date: Mon, 21 Jan 2002 12:42:34 +0100
From: "Yantao Chen" <
yantao@thinfilm.se>
Subject: commercial availability

Dear All:

I am looking for the commercial availability of the organic alcohols with
the following general structure: X-Ph-(CH2)n-OH, where X could be NO2, MeO,
H and etc., n: from 0 to 12. Any information?

Thanks in advance.

Regards, yantao

------------------------------
End of orglist Digest V01 #115
******************************

orglist Digest Sat, 26 Jan 2002 00:01:32 -0800 V01 #116

Today's topics:
'Suggestions for a buffer'
'Re: ORGLIST: How to regenerate 'used' alumina'
'RE: ORGLIST: Overpressure valves'
'prediction of dipole'
'Removal benzyl protecting group'

----------------------------------------------------------------------

Date: Mon, 21 Jan 2002 22:56:00 +0100
From: Andrea Giordano <
andrea.giordano@mlib.cnr.it>
Subject: Suggestions for a buffer

Dear readers of Orglist,

as previously stated (Kresze et al., Organic Prep. and Proced. Int., 19,
1985, pp329-426), "the reactions of oximes with elemental chlorine or
bromine are usually carried out in aqueous or basic solutions".

I need a buffer for an acqueous pH value of 5.5, unreactive and stable
versus chlorine gas.

Any suggestion (better than CH3COOH/CH3COONa)??

Thank you in advance,
Andrea Giordano
ICN-CNR, Rome, Italy.

------------------------------

Date: Tue, 22 Jan 2002 11:26:11 +0200
From:
zabicky@bgumail.bgu.ac.il (Jacob Zabicky)
Subject: Re: ORGLIST: How to regenerate 'used' alumina

Hello Fergus,

The following is worth pursuing only if your quantities are really large.
Determine first what kind of alumina you have at hand (most probably you
have beta or gamma alumina, but it may be another variety). This can easily
be done by powder X-ray diffraction, and needs being done to ensure that
you do not change the nature of the material on doing the following
treatment:

Take a small sample of the material and calcinate it in an oven at 500 C,
for at least 1 hour. Check if the diffraction pattern remained unchanged.
If so there you have the procedure to achieve a regenerated/cleaned alumina
for reuse. If the pattern changed, slightly reduce the calcination
temperature, but the time of calcination should be longer. Repeat this
procedure until the diffraction pattern is constant. Calcination at lower
temperatures may leave a dark hue on the material. This need not
necessarily be bad for the purpose you stated. Before you go on
regenerating the whole amount, its worthwhile testing whether the small
sample you prepared does the intended job.

All the best,

Jacob
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x
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
Fax. +972-8-6472969
x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x

------------------------------

Date: Mon, 21 Jan 2002 18:04:13 -0000
From: Ismail F <
F.M.Ismail@livjm.ac.uk>
Subject: RE: ORGLIST: Overpressure valves

Dear Dr. Engel,

You can use a variety of systems and can replace mercury with a viscous
hydrocarbon oil. One cheap solution is to use motor car oil or, more
expensively, a silicone oil. If use a double vacuum manifold as described
in:

Leonard J., Lygo B., Proctor G., Advanced Practical Organic Chemistry, 3rd
ed. 1998. Stanley Thorne Publishers.

Available from Aldrich (e.g. z17,443-2.

An additional tap mounted into the middle of the manifold allows one side of
this system to be under slightly greater pressure than the other. The flow
rate can be adjusted through the manifold by manipulating the gas flow rate
using an oil filled bubbler before and after the vacuum line. Normally I use
a one 500 cm tall bubbler with an in-built trap to prevent ingress of the
oil into the reaction vessel.
Using flexible tubes (e.g. Chem-flex) equipped with needles allows
connection of the line and flask through a white rubber septum (suba seals
available from the Aldrich Chemical Company e.g. Z10,074-9)and, therefore,
safely pressurise the flask. The seal can be kept in place using and a wrap
it ties (Z 10,595-3). An additional needle inserted into the septum relieves
pressure (and toxic volatile substance, if any) back to the line.
alternatively, you can also use the Aldrich Firestone Valve (z 10,361-6).

http://www.staff.livjm.ac.uk/pacfisma/

Dr. Fyaz M.D. Ismail

Senior Lecturer in Medicinal Chemistry
The Medicinal Chemistry Research Group
The School of Pharmacy and Chemistry
Liverpool John Moores University
Room 221C James Parsons Building
Byrom Street
Liverpool L3 3AF
f.m.ismail@livjm.ac.uk
Telephone: +44 (0)151 231 2231.

------------------------------
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