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ORGLIST - Organic Chemistry Mailing List


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JULY – DECEMBER 2002


Digest #36 Today's Topics:

   1. Nitrophthalic acid (dr samy said)


--__--__--

Message: 1
Date: Tue, 2 Jul 2002 04:17:41 -0700 (PDT)
From: dr samy said <
sbsaid@yahoo.com>
To:
Everybody@orglist.net
Subject: ORGLIST:Nitrophthalic acid


Hi  Every Body
 I`m looking for  method for esterification of 3-/or
4-nitrophthalic acid.
Thank you very much

 Samy B. Said
sbsaid@yahoo.com

--__--__--


Digest #37 Today's Topics:

   1. stability of dialkyldisulfide (Jon Kremsky)
   2. Re: stability of dialkyldisulfide (Eric J. Leopold)
   3.
Schiff Base reduction (Jordan, Michael (EI06))
   4.
Re: stability of dialkyldisulfide (John S. Roberts)

--__--__--

Message: 1
Reply-To: <
jkremsky@primeorg.com>
From: "Jon Kremsky" <
jkremsky@primeorg.com>
To: <
everybody@orglist.net>
Date: Tue, 2 Jul 2002 16:39:08 -0400
Subject: ORGLIST: stability of dialkyldisulfide


Colleagues:

What is the stability of dialkyldisulfide towards bases, specifically sodium
or potassium hydroxide?  I have searched some of my general texts, but have
been unable to find an answer.

Jonathan N. Kremsky, Ph.D.

--__--__--

Message: 2
Date: Tue, 2 Jul 2002 17:47:48 -0700
To: <
jkremsky@primeorg.com>
From: "Eric J. Leopold" <
ejlmp@earthlink.net>
Subject: Re: ORGLIST: stability of dialkyldisulfide
Cc:
everybody@orglist.net

My guess is this is a stable combination as such compounds are
synthesized with KOH or NaOH. See Org Syn. Collective vol 6, 235
(1988), Alonso, et al. Good luck.
Eric
Need to cleave a peptide-resin? See
http://home.earthlink.net/~ejlmp/TMSX1.html

--__--__--

Message: 3
From: "Jordan, Michael (EI06)" <
jordan.michael.ARK@honeywell.com>
To: "
'everybody@orglist.net'" <everybody@orglist.net>
Date: Wed, 3 Jul 2002 09:51:00 +0200
Subject: ORGLIST:Schiff Base reduction


Does anybody know if it is possible to use phase transfer catalysis to
reduce imines?

> Dr. Michael Jordan

--__--__--

Message: 4
From: "John S. Roberts" <
johnSRoberts@worldnet.att.net>
To: <
jkremsky@primeorg.com>, "Eric J. Leopold" <ejlmp@earthlink.net>
Cc: <
everybody@orglist.net>
Subject: Re: ORGLIST: stability of dialkyldisulfide
Date: Wed, 3 Jul 2002 06:17:08 -0500


They are stable with KOH or NaOH.

John Roberts

--__--__--


Digest#38 Today's Topics:

   1. DIDNTB reagent request (Ali Asadi)


--__--__--

Message: 1
Date: Sat, 6 Jul 2002 04:15:14 -0700 (PDT)
From: Ali Asadi <
a_alchemist@yahoo.com>
To:
everybody@orglist.net
Subject: ORGLIST:DIDNTB reagent request


Hi All ,

I am seeking for the trade source of "  bis(3,3'-diiodo-4,4'-dihydroxy-5,5'-dinitro-phenyl) 3,4,5,6-tetra bromosulfophthalein " its abbreviation is DIDNTB,

I will be very thankful if you have any information about this reagent and its manufacturing company.

Thanks in advace,

Dr. Ali Asadi


--__--__--


Digest #39 Today's Topics:

   1.
MOM-MSf (Bert Kruiswijk)

--__--__--


Message: 1
From: Bert Kruiswijk <
b.kruiswijk@sbc.bbk.ac.uk>
To: everybody <
everybody@orglist.net>
Date: Wed, 10 Jul 2002 16:26:47 +0100
Subject: ORGLIST:MOM-MSf


I am looking for non Russian references for the use of methoxy methyl
methyl sulfate (MOM-msf) used by Lebedev for the methoxymethylation of
alkenes.

Thanks,

Bert Kruiswijk


--__--__--


Digest #40 Today's Topics:

   1. N-Formylation of sec-Amines (Albino RUBELLO)


--__--__--

Message: 1
From: "Albino RUBELLO" <
rubello.ribbon@libero.it>
To: <
everybody@orglist.net>
Date: Fri, 12 Jul 2002 14:24:56 +0200
Subject: ORGLIST:N-Formylation of sec-Amines


  Does someone know how the experimental conditions to transform a
secondary amine into its N-FORMYL DIMETHYLACETAL DERIVATIVE usind the
DIMETHYLACETAL of DMF ?

  Thanks to all

  Albino

--__--__--


Digest #41 Today's Topics:

   1. Citations (MOHAMMAD ARFAN)
   2. Regenerating molecular sieve 4A (Andrea Giordano)


--__--__--

Message: 1
From: "MOHAMMAD ARFAN" <
arfanmohammad@hotmail.com>
To:
everybody@orglist.net
Date: Fri, 12 Jul 2002 15:40:57 +0000
Subject: ORGLIST:Citations


Hi Friends,
Any one who can tell me a free website or database for obtaining citations of my research articles published in chemistry (mostly organic chemistry) research journals since 1981. Thanks in advance for the help.


Mohammad Arfan, Ph.D
Professor of Chemistry, Department of Chemistry
University of Peshawar, Peshawar, Pakistan

--__--__--

Message: 2
Date: Sat, 13 Jul 2002 01:39:01 +0200
From: Andrea Giordano <
andrea.giordano@mlib.cnr.it>
To:
everybody@orglist.net
Subject: ORGLIST:Regenerating molecular sieve 4A


hello all,

this may sound curious, or maybe a nonsense, but anyway...

I suppose many of you had the chance to use molecular sieves (the one with
blue indicator for istance) to dry/store liquids.
Well, when I had to regenerate them, I simply used a common oven for
glassware, 'cause it's the only one we have in the lab.
Usually temp. is set to 140° C, or something, and we just leave it that way;
that value seems to be enough for regenerating the sieves, at least I always
observed the apparence of the blue color of the indicator (after having left
in the oven for 2/3 days).
Anyway, it's written that temp. should be higher for regenerating...

Just wondering.....could you use a microwave oven (after having purged the
sieves with water, of course...) to regenerate them??

thanks!
A. Giordano
IMC-CNR
Rome.

--__--__--


Digest #42 Today's Topics:

   1. Re: Citations (Yuehui Zhou)


--__--__--

Message: 1
From: "Yuehui Zhou" <
yuehuizhou@hotmail.com>
To:
arfanmohammad@hotmail.com
Cc:
everybody@orglist.net
Subject: Re: ORGLIST:Citations
Date: Sat, 13 Jul 2002 20:52:00 +0000


"Web of Science" may be the best tool for that purpose. There may be a free trial for the data base. Try to search the website of this service. Good luck!


--__--__--


Digest #43 Today's Topics:



   1. Re: Citations (chemelf@gmx.net)

--__--__--

Message: 1
From: chemelf@gmx.net
Date: Sun Jul 14 2002 - 03:11:42 EDT

Subject: Re: ORGLIST: Citations


www.chemweb.com - Free registration, free Belstein Abstract since
1980.

Best regards,
chemelf

http://chemelf.tripod.com
mailto:chemelf@gmx.net


--__--__--


Digest #44 Today's Topics:



1. Re: ORGLIST: Regenerating molecular sieve 4A (Jacob Zabicky)

2. Re: ORGLIST: Regenerating molecular sieve 4A (David Kelly)


--__--__--


Message: 1
From: Jacob Zabicky (zabicky@bgumail.bgu.ac.il)

To: everybody@orglist.net
Date: Sun Jul 14 2002 - 09:27:04 EDT

Subject: Re: ORGLIST: Regenerating molecular sieve 4A


Hello Andrea,

Yours is a very interesting question. It's worth trying a small amount of
the stuff, say 0.5 g, and see how dry does it get (wt. loss), and whether
its morphology changes. A possible scenario is this: Water effectively
absorbs the microwaves. so a very hot local spot may be produced. Say that
happens in a small spot inside the molecular sieve, rising the temperature
to several hundred deg. C, over the critical temperature of water. The
highly compressed gaseous water may break the crystalline structure and the
stuff may literally pop out. But it may be a very placid process too. Just
try it!

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


--__--__--


Message: 2

From: David Kelly (KellyDR@Cardiff.ac.uk)

To: everybody@orglist.net
Date: Mon Jul 15 2002 - 14:00:23 EDT

Subject: Re: ORGLIST: Regenerating molecular sieve 4A


Copper sulphate impregnated molecular sieves? Are you sure this is
not silica gel?

To dry sieves efficiently you need to use a vaccum oven/pistol and
circa 250 degrees C for 3+ hours. Any attempt to dry in the
atmosphere leaves them wet. We have taken circa 100g of oven dried
sieves and subjected them to heating in vacuum. In the early stages
sufficient water was removed to wet the inside of the apparatus.

Good drying agents require severe drying conditions to
make them anhydrous.

While we are on lab myths. Drying magnesium turnings in an ordinary
oven is also totally pointless.


Good luck

DaveDr David R. Kelly
Dept. of Chemistry, Cardiff University, PO Box 912, Cardiff, CF10
3TB, UK
Phone 02920-874063: Fax 02920-874030
Mobile 07971-240448: Home 02920-610891
Web page http://www.cf.ac.uk/uwc/chemy/staff/kelly.html
For the "Elephants and Butterflies" article see
http://www.semiochemica.org.uk/articles/articlesidx.html
BEST Record: http://expertise.cos.com/cgi-bin/exp.cgi?id=498275
For catalysis see http://www.chemsoc.org/cgi-
shell/events/nforedisp.pl?ID=551
Cardiff University is the public name of the University of Wales,
Cardiff, a constituent institution of the
University of Wales.


--__--__--


Digest #45 Today's Topics:

   1. Griffith-Prions (Shu G. Chen)


--__--__--

Message: 1
From: "Shu G. Chen" <
sxc59@po.cwru.edu>
To: <
everybody@orglist.net>
Date: Thu, 18 Jul 2002 00:28:39 -0500
Subject: ORGLIST:Griffith-Prions


Does anyone knows the first name for Griffith who first proposed
"protein only" hypothesis for prions?

-------------------------------------------------
Shu G. Chen, Ph.D.
Institute of Pathology
Case Western Reserve University
2085 Adelbert Road
Cleveland, OH 44106-4907
Tel:  216-368-8925
Fax: 216-368-2546
E-mail: sxc59@po.cwru.edu

--__--__--


Digest #46 Today's Topics:

   1. polyamide and a diamine reaction (Guzin Ozgel)
   2. help needed on assay protocols for metals using 5-bromoanthranilic acid (sam)


--__--__--

Message: 1
Date: Fri, 19 Jul 2002 06:37:41 -0700 (PDT)
From: Guzin Ozgel <
gzgel@yahoo.com>
To:
everybody@orglist.net
Subject: ORGLIST:polyamide and a diamine reaction


Dear All,

I have got an amide in my hand obtained by reacting
2,6-dichloro-p-phenylenediamine and benzoyl chloride
in triethylamine and chloroform solution.
What molecule would I obtain if I would react it with
ortho-phenylenediamine in triethylamine preceded by a
reaction of trichloroacetic anhydride reaction?

If you have ideas to suggest me, I would appreciate
your effort.

thanks and regards,
Guzin Ozgel
Marmara University, Turkey

--__--__--

Message: 2
From: "sam" <
ttn_ponraj@sancharnet.in>
To: <
everybody@orglist.net>
Date: Mon, 22 Jul 2002 07:07:55 +0530
Subject: ORGLIST:help needed on assay protocols for metals using 5-bromoanthranilic acid


Dear all

I am making 5-bromoanthranilic acid and 5-bromoindoxyl acetate. For the
first one there is a reference in Merck Index saying it is used for
determination of Cobalt, Nickel, copper and zinc. I would like to supply =
the assay protocol along with the chemical. Can somebody help me find =
the assay protocol for the determination of these metals using =
5-bromoanthranilic acid.  Second one is a chromogenic substrate for =
esterases. Also kindly contact me for buying these chemicals as I could =
offer the best price.

Looking forward

thank you

sam

--__--__--

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