HDTenEightyP/NetNews huggingface dataset:
From: tmiller@camms2.caos.kun.nl (Todd M. Miller)
Subject: Re: Request for comments: computerized chemical structure drawing
Keywords: TeX, chemistry, computers, typesetting, formulas
Organization: University of Nijmegen
Date: Tue, 1 Sep 1992 08:31:49 GMT

bwildasi@silver.ucs.indiana.edu (Ben Wildasin) writes:


>I am developing a chemical structure-drawing macro package for plain TeX
>(not LaTeX, although it might be compatible). This survey is
>intended to gauge the level of interest in such a package and the
>features that potential users would like to see included.

Relevant Information:

"Typesetting Chemical Structure Formulas with the Text Formatter 
TeX/LaTeX" by Roswitha T. Haas and Kevin C. O'Kane, in the journal
Computers & Chemistry, Vol 11, No. 4, p 251-271, 1987 reprints some macros
used for various chemical rings, branches and symbols.  Very useful for
drawing simplier structures or even attaching two together, but only a 
limited range of angles for lines that make up the structure was possible. 



						Todd M. Miller

  New CAOS/CAMM/CAMMSA Gopher site:            camms1.caos.kun.nl port 70
				Go'pher it.
--
Newsgroups: sci.chem
Subject: CoPolymerization Reactivity Ratios
From: chappelow@vax1.umkc.edu
Date: Tue, 25 Aug 1992 21:59:00 GMT
Organization: University of Missouri - Kansas City

Hi!
     
     We are searching for software which will calculate copolymerization
reactivity ratios by published and unpublished methods.
     If anyone know of the existance of such kind of software, please email or
post information concerning the software.



Thanks a lot.
+=============================================================================+
|                                  |                                          |
|  Dr. Cecil Chappelow             | Internet : <Chappelow@vax1.umkc.edu>     |
|  Senior Advisor - Material Sci.  | BitNet   : <Chappelow@UMKCVAX1>          |
|  Midwest Research Institute      |                                          |
|  425 Volker Boulevard            |                                          |
|  Kansas City, Missouri  64110    |                                          |
|  United States of America        | Telephone : +1-816-753-7600 Ext. 376     |
|                                  | Fax       : +1-816-753-8420	      |
|                                  |                                          |
+=============================================================================+
Newsgroups: sci.chem
From: mvp@hsv3.lsil.com (Mike Van Pelt)
Subject: Re: the TRUTH about Methylene Chloride
Organization: LSI Logic/Headland Technology
Date: Tue, 1 Sep 1992 23:03:29 GMT

In article <1992Aug27.183758.29262@nap.amoco.com> pgravel@nap.amoco.com (Philip L. Gravel) writes:
>Get a bottle of reagent grade sodium chloride or washed sand and read the 
>labels on them.  You'll be terrified of them too!!!  ...
>sucrose (sugar)

Sucrose soundes much scarier if you use IUPAC nomenclature...  modulo
mispelings (sic), that's alpha-D-glucopyranosyl-beta-D-fructofuranoside.

-- 
Mike Van Pelt          | What happens if a big asteroid hits Earth?
LSI Logic/Headland     | Judging from realistic simulations involving a
mvp@hsv3.lsil.com      | sledge hammer and a common laboratory frog, we
sun!indetech!hsv3!mvp  | can assume it will be pretty bad. -- Dave Barry
From: stngiam@athena.mit.edu (Shih-Tung Ngiam)
Newsgroups: sci.chem
Subject: Re: HELP : Slurries
Date: 3 Sep 92 14:13:39 GMT
Distribution: sci.chem
Organization: Massachusetts Institute of Technology


  What material are you working with?  Oven drying might cause some
chemical reaction.  Even if you have a completely insoluble non-reacting
solid, the act of drying, and stirring up to resuspend the solid
particles might crush the particles, giving you a different particle
size distribution.

Shih Tung
Chem E
Best l'il Tech School
on the Charles
Newsgroups: sci.chem
From: harigaya@etl.go.jp (Kikuo Harigaya)
Subject: Re: Bucky Ball Mailing List
Content-Type: text/plain; charset=US-ASCII
Reply-To: harigaya@etl.go.jp (Kikuo Harigaya,,,Bussei-kiso)
Organization: Electrotechnical Laboratory, Tsukuba Science City
Mime-Version: 1.0
Date: Wed, 26 Aug 1992 20:01:29 GMT

On 08/27/92(01:35) bonneau@hyper.com (Paul Bonneau,,) wrote
in <1992Aug26.163514.20665@hyper.hyper.com> (sci.chem:4497/etlss2):
 |Hi all,
 |
 |Would some kind soul please give me the address of the Bucky
 |Ball mailing list?  I am one of the developers of Autodesk's
 |HyperChem (GUI part only--I am not a chemist), and I have
 |been playing with fullerene's for the last little while.  In
 |addition to the well known c60 and c70, I have played with:
 |
 |c80,
 |c84,
 |both optical isomers of c140,
 |c180,
 |c210,
 |c240, (mentioned by H. W. Kroto, Angewandte Chemie, 1992, 31, 111)
 |both optical isomers of c260, and
 |c320.
 |
 |I have not seen any mention of c80 or c84, but perhaps
 |someone from the mailing list could fill me in.  I have
 |Brookhaven versions of these molecules available if anyone
 |would like them.

The address of the "Bucky News Service" is

bucky@sol1.lrsm.upenn.edu.

In order to know how to use, please send the message

Subject: INTRO

to the above adress.   The text is not needed, only the subject message
with CAPITAL LETTERS shoud be sent.

Regards,
Kikuo
-- 

$@"#""(J $@?KC+4n5WM:!wJ*@-4pAC8&5f<<(J.$@EE;R4pACIt(J.$@EE;R5;=QAm9g8&5f=j(J $@"""#(J
$@"""#(J <harigaya@etl.go.jp> TEL: 0298-58-5151 FAX: 0298-58-5375 $@"#""(J
Newsgroups: sci.chem,sci.engr.chem,sci.physics
From: mfrancis@binah.cc.brandeis.edu (Ma. Elena Y. Francisco)
Subject: Re: Pop Corn Physics and Chemistry
Reply-To: mfrancis@binah.cc.brandeis.edu
Organization: Brandeis University
Date: Wed, 2 Sep 1992 21:14:07 GMT

wet!noah@well.sf.ca.us (Noah Spurrier) writes:
 
>> I am looking for any information or references to the physics and chemistry
>> of pop corn.  [...]

plaut@sc2a.unige.ch (Olivier PLAUT) writes:

>There is an excellent article in the J. Chem. Educ. about that.
>
>I think I red it in the spring 1992. Assuming it was a 'fresh'
>volume, it may be in one of the last numbers of 1991 or in the
>early numbers of '92.

Yes, a quick look at Current Contents yields this information:

Sauls, F.C.  "Why does Popcorn Pop -- An Introduction to
    the Scientific Method.  J. Chem. Educ. 1991 May
    v68 n5:  415-16.


--
==============================================================================
Lyn Francisco, First Year Graduate Student	|"There is no power stronger
Brandeis University, Dept. of Chemistry		| Than gentleness of heart."
BitNet:    mfrancis@brandeis.bitnet		|
Internet:  mfrancis@binah.cc.brandeis.edu	|	-- Jose Mari Chan
==============================================================================
Xref: sparky sci.chem:3291 sci.misc:1537 sci.engr:1962 sci.engr.chem:441 misc.misc:3217
From: gs32+@andrew.cmu.edu (Geoffrey Spear)
Newsgroups: sci.chem,sci.misc,sci.engr,sci.engr.chem,misc.misc
Subject: Re: gold test
Date: 28 Aug 92 14:41:16 GMT
Article-I.D.: andrew.EebeiA_00aw3ABYVRj
Organization: Carnegie Mellon, Pittsburgh, PA


	Find a really powerful acid (don't use aqua regia...), stick the powder
in it, and what doesn't dissolve is probably gold.  Of course, this WILL
destory anything the gold  might be mixed with, so there's probably an
easier way to do it.
Newsgroups: sci.chem
From: mara@vuw.ac.nz (Mara)
Subject: HELP : Slurries
Organization: /u/student/mara/.organization
Date: Thu, 3 Sep 1992 03:09:21 GMT
Distribution: sci.chem



Hello. I am a chemistry undergraduate student doing work in my study break   
involving preparation of slurries from raw sources and then investigation of 
the drying of these.  
	As you might guess, preliminary determination of the % solids in each
slurry is carried out by oven drying weighed samples and calculating
appropriate differences.  Easy enough.
	My problem is, although the calculated % solids in the slurries
are agreeing (to within 0.4% of the total), when I tried to make up further 
stock slurry with all the dried material left over from the determinations and
the corresponding, calculated amount of water, the resulting mixture was of
a completely diffferent consistency (thicker, if that is relevant).

	My calculations are all in order, and the double-check drying I set
up yesterday indicates that my initial % solids was correct.

	What can have happened? Even if the solid matter _was_ changed in 
the process of oven drying, it is the same state that I am working from
in each case.

	Miraculous suggestions and answers gratefully received :)

Amy Gale
mara@kauri.vuw.ac.nz

 
Newsgroups: sci.chem
From: knapp@spot.Colorado.EDU (David Knapp)
Subject: Re: Luminescent Paint (Q)
Organization: University of Colorado, Boulder
Date: Sat, 29 Aug 1992 15:41:23 GMT

In article <2a9e61b8wnr070@ark.abg.sub.org> ralf@ark.abg.sub.org (Ralf Stephan) writes:
>knapp@spot.Colorado.EDU (David Knapp) writes:
>> 
>> ZnS comes to mind.
>
>That leads me to the question:  Does ZnS alone suffice?  I remember trying
>it as a boy, and I think I also "doped" it with traces of some metal but
>I never succeded.  Of course one needs an UV lamp for that?
>
>--ralf


I think so.  You'd probably be better off just getting an Edmund Scientific
catalog and getting some from them, though.
-- 
David Knapp                                      University of Colorado, Boulder
Highly Opinionated, Aging  and                      knapp@spot.colorado.edu
Perpetual Student of Chemistry and Physics.
            Write me for an argument on your favorite subject.
Xref: sparky sci.chem:3320 sci.engr.chem:443 sci.physics:13864
From: wet!noah@well.sf.ca.us (Noah Spurrier)
Newsgroups: sci.chem,sci.engr.chem,sci.physics
Subject: Pop Corn Physics and Chemistry
Date: 31 Aug 92 18:16:03 GMT


Anyone out there interested in some amateur physics and chem of pop corn?

I am looking for any information or references to the physics and chemistry
of pop corn.  What is the velocity of the pop (i.e. How long does it take
to go from kernel to pop corn?)  What is the mechanism of the pop?  What
temperatures and pressures are formed inside the corn kernel in order for
it to pop?  Why does the material inside the kernel behave the way it does?
Do any other grains behave this way?  Do we get Rice puffs the same way we
get poped corn?

If you could site any books or journal articles then I would be especially
happy.

Reply post and send Email to
noah@wet.UUCP
Newsgroups: sci.chem
From: knapp@spot.Colorado.EDU (David Knapp)
Subject: Re: air and experiment
Organization: University of Colorado, Boulder
Date: Tue, 25 Aug 1992 18:34:36 GMT

In article <A46113@MS.maus.de> Christian_Mueller@ms.maus.de (Christian Mueller) writes:
>Hello
>I need help!
>
>I am searching some experiments (or books with illustrated experiments)
>about analysis of the air.(harmfull substances as NOx,CO,CO2,...)
>It's very urgent, because I need it to make my examination (teacher/chem.math)
>I prefer easy experiments because they must be realize by pupils.
>
>I'm also interest about experiments whitch can make clear the function
>of a kathalysator(in a car).
>
>Bye
>
>Christian Mueller-Vanheiden
>Hammerstrasse 105
>4400 Muenster
>Germany
>(Net)


Passing oxygen and carbon monoxide over Pd/Pt on zeolite (common catalyst) in 
a pyrex tube is a *great* demonstration. It is so exothermic that the pyrex
can actually melt.  


-- 
David Knapp                                      University of Colorado, Boulder
Highly Opinionated, Aging  and                      knapp@spot.colorado.edu
Perpetual Student of Chemistry and Physics.
            Write me for an argument on your favorite subject.
From: betanu@sage.cc.purdue.edu (ALPHA CHI SIGMA)
Newsgroups: sci.chem
Subject: Callout
Date: 30 Aug 92 21:52:20 GMT
Organization: Purdue University

Do YOU like Chemistry?
Then come to the Alpha Chi Sigma callout.
Callouts are Wednesday, Sept. 2 or Thursday, Sept. 3 at 7:30 pm in room 314 of the Wetherill Laboratory of Chemistry.
-- 
This message is from the Beta Nu chapter of the Alpha Chi Sigma professional    Chemistry fraternity.  We co-ed fraternity, that is not an honor society, located at Purdue University.  If you have Questions concerning this organization,    please contact us on email at [ betanu@sage.cc.purdue.edu ] or by phone at      (317)-743-2861. 
Newsgroups: sci.chem
From: vsummers@polaris.cv.nrao.edu (Vince Summers)
Subject: Re: Alcohol derivitization (adding 3,5-Dinitrobenzoate)
Organization: National Radio Astronomy Observatory
Distribution: na
Date: Thu, 27 Aug 1992 13:09:21 GMT

In article <7923@lee.SEAS.UCLA.EDU> grayson@hougen.seas.ucla.edu (David A. Grayson) writes:
Path: cv3.cv.nrao.edu!uvaarpa!darwin.sura.net!mips!bridge2!news.claremont.edu!ucivax!ucla-cs!ucla-se!hougen.seas.ucla.edu
   From: grayson@hougen.seas.ucla.edu (David A. Grayson)
   Newsgroups: sci.chem
   Date: 26 Aug 92 22:48:42 GMT
   Sender: news@SEAS.UCLA.EDU
   Distribution: na
   Organization: SEASnet, University of California, Los Angeles
   Lines: 37


   I am trying to derivatize the hydroxyl group of 1-tetralol (not a true
   glycol, but the technique I have adopted is commonly used for glycols).
[B
   1-tetralol is 1,2,3,4 -tetrahydronaphthol. I use methylene chloride
   as my delivery solvent. (3.27 mg in 2 mL CH2Cl2) 

   The reaction takes place in pyridine.

   I use 30 ml pyridine with 0.5 g of 3,5-Dinitrobenzoyl chloride (DNB-Cl) and
   add ~ 1 ml of the 1-tetralol/methylene chloride solution to it. Heat this
   mixture (w/stirring) to 60 C for 15 minutes.

   Here is my problem. I can't get this heated solution to pH 2.5. I get down to
  [B about 4.8 and then nothing. Does anyone see a likely suspect as my acid
   sink? I wouldn't worry about it, but I am adding so much HCl, that I seem
   to be forming some sort of floating ppt.. 

   I know about the problems of pHing an organic solution, but by the time I 
   finally gave up the last time. I had gone from ~30 mL organic to ~80mL 
   total volume. Greater than 2% aqueous solution (50 mL of HCl ~60%) should be 
   enough to let any pH meter work. The 50 mL of HCl added were done as follows
   10 mL 1N HCl, 30 mL 5N HCl, and then 10 mL concentrated HCl. 

   I took this method from M.A. Carey and A.F. Persinger, J. Chromatogr. Sci.,
   vol. 10, page 537 (1972). It can also be found in the Handbook of
   Analytical Derivatization Reactions by Daniel R. Knapp, John Wiley
   & Sons pages 41 & 97 (1979).


   thanks for any and all help

   dave
          Dave, forgive me if I'm being an ass, but might not the pyrdine
be reacting with the HCl to neutralize it?
                              Vince Summers
vsummers@polaris.cv.nrao.edu


   --
   UCLA, Dept. Chem. Eng., 5805 Boelter Hall, LA, CA 90024
   David A. Grayson                  grayson@seas.ucla.edu
Newsgroups: sci.chem
From: ivan@erich.triumf.ca (Ivan D. Reid)
Subject: MOPAC bug solved (I think)
News-Software: VAX/VMS VNEWS 1.41    
Organization: TRIUMF: Tri-University Meson Facility
Date: Fri, 28 Aug 1992 08:57:00 GMT

	Thanks to all who replied to my question about MOPAC support.  While
I have yet to receive an answer from Dr Stewart, I believe I have solved the
problem myself.

	The problem lay with two undeclared variables in subroutine DERNVO.
I have just discovered that the VAX versions of MOPAC 6.0 do not have this
problem (the mirror server nic.funet.fi was unavailable for a while due to
disk problems or I may have discovered this earlier).  The "original" (for
most people) archive of MOPAC, ouchem.chem.oakland.edu, has two versions,
one for UNIX and one for VAX.  The UNIX versions there do still have the bug!
My copy came from UToronto and was based on the UNIX versions, I believe.  On
the assumption that the oakland/funic VAX versions are up-to-date, I will just
copy them across to replace my current sources.

Ivan Reid, Paul Scherrer Institute, CH.     			ivan@cvax.psi.ch
From: rs@sys.uea.ac.uk (CHE Guest News Login)
Newsgroups: sci.chem
Subject: Re: chemistry ftp sites
Date: 2 Sep 92 13:50:21 GMT
Organization: UEA School of Information Systems, Norwich, UK.

I would also be interested in having info about ftp sites dealing with chemistry.Is there a FAQ  related to this sci.chem.
Please post or mail to me
rs@uk.ac.uea.sys.radon
Newsgroups: sci.chem
From: vsummers@polaris.cv.nrao.edu (Vince Summers)
Subject: Re: Organic Models Kit:  How helpful?
Organization: National Radio Astronomy Observatory
	<65100@cup.portal.com>
Date: Wed, 2 Sep 1992 12:43:00 GMT

In article <65100@cup.portal.com> James_J_Kowalczyk@cup.portal.com writes:
Path: cv3.cv.nrao.edu!uvaarpa!darwin.sura.net!haven.umd.edu!uunet!portal!cup.portal.com!James_J_Kowalczyk
   From: James_J_Kowalczyk@cup.portal.com
   Newsgroups: sci.chem
   Date: Tue,  1 Sep 92 20:46:24 PDT
   Organization: The Portal System (TM)
   References: <1992Aug29.192335.5440@col.hp.com>
     <1992Aug29.220610.169722@zeus.calpoly.edu>
   Lines: 20

   chrism@col.hp.com (Chris Magnuson) writes:
[B
   >  How helpful are the plastic beads model kits for learning organic chemistr
   >Would computer modeling programs be better?  If so, can someone recommend on
   >for the Mac?
   >
   >Thanks in advance,
   >chrism@col.hp.com

   Every organic chemist should (and probably does) own a model kit.
  [B Building a model can be invaluable in considering a structure.
   Computer modelling has its uses, obviously, but there is nothing
   quite like building a model of a molecule and holding it in your hand,
   twisting it around, tossing it in the air, etc., to give you a real
   "feel" for the compound. :)

   Jim Kowalczyk             James_J_Kowalczyk@cup.portal.com
   Sr. Research Chemist
   Eisai Research Institute
   Andover, MA 01810 

          I agree it is useful to own a model kit.  If you can't afford
the more expensive ones, but only the student kits, and if you're
into organic chemistry, you will need perhaps 3-5 kits to get 
enough carbons, etc. to construct decent-sized molecules.

Vince Summers
vsummers@polaris.cv.nrao.edu
	c	c
From: pbays@bach.helios.nd.edu (phil bays)
Newsgroups: sci.chem
Subject: Re: Organic Models Kit:  How helpful?
Date: 1 Sep 92 12:06:54 GMT
Organization: University of Notre Dame, Notre Dame

Phil Bays
Saint Mary's College
Notre Dame, In 46556
(219) 284-4663
Newsgroups: sci.chem
From: tony2@prefect.uucp (21131-gozdz)
Subject: Re: 1,4-dichloro-2-butyne
Organization: Bellcore, Livingston, NJ
Date: Thu, 3 Sep 92 15:51:52 GMT

In article <1992Sep3.032555.3246@mnemosyne.cs.du.edu> aankrom@nyx.cs.du.edu (Anthony Ankrom) writes:
>
> I need to know a facile synthesis for 1,4-dichloro-2-butyne. Please post
>or e-mail...
>

Why bother with the synthesis if Aldrich sells it for $38/25g?
(there are at least 7 other suppliers here in the US).

--Tony
Xref: sparky sci.chem:3343 sci.engr.chem:448 sci.physics:13958
Newsgroups: sci.chem,sci.engr.chem,sci.physics
Subject: Re: Pop Corn Physics and Chemistry
From: plaut@sc2a.unige.ch (Olivier PLAUT)
Date: 2 Sep 92 10:13:14 +0200
Organization: University of Geneva, Switzerland

In article <m0mPFQz-0001GUC@wet.uucp>, wet!noah@well.sf.ca.us (Noah Spurrier) writes:
> 
> Anyone out there interested in some amateur physics and chem of pop corn?
> 
> I am looking for any information or references to the physics and chemistry
> of pop corn.  What is the velocity of the pop (i.e. How long does it take
> to go from kernel to pop corn?)  What is the mechanism of the pop?  What
> temperatures and pressures are formed inside the corn kernel in order for
> it to pop?  Why does the material inside the kernel behave the way it does?
> Do any other grains behave this way?  Do we get Rice puffs the same way we
> get poped corn?
> 
> If you could site any books or journal articles then I would be especially
> happy.
> 
> Reply post and send Email to
> noah@wet.UUCP

There is an excellent article in the J. Chem. Educ. about that.

I think I red it in the spring 1992. Assuming it was a 'fresh'
volume, it may be in one of the last numbers of 1991 or in the
early numbers of '92.

Olivier.
-- 

-------------------------------------------------------------------
 Olivier Plaut                   |  
 Institute of Forensic Medicine  |   Phone:    +41 (22) 702.56.12  
 Toxicology Unit                 |   Fax:      +41 (22) 789.24.17  
 University of Geneva            |
 Av. de Champel 9                |   E-mail:  plaut@sc2a.unige.ch  
 CH-1211 Geneve 4                |            plaut@cgeuge52.bitnet
 Switzerland                     |   
-------------------------------------------------------------------
Newsgroups: sci.chem,rec.autos,rec.autos.tech,misc.consumers,sci.environment,talk.environment
From: userDHAL@mts.ucs.UAlberta.CA (David Halliwell)
Subject: Re: Carburetors, gasoline, and why I don't recycle
Organization: University Of Alberta, Edmonton Canada
Distribution: na
Date: Thu, 3 Sep 1992 18:56:35 GMT

knapp@spot.Colorado.EDU (David Knapp) writes:

>In article <Btz7xq.H47@news.cso.uiuc.edu> cec35848@uxa.cso.uiuc.edu (Chuck Carroll) writes:
>>1)  You'll need a pretty good estimate of friction, since without it
>>it would take no energy to move a car over level ground. 


>What about W=F*d?  Ek=1/2m*(dV)^2?  P=m(dV)?

   What about "An object in uniform motion will continue in uniform motion 
unless acted upon by a force"? The only energy required would be that used
to accelerate the car to a given speed. After that, the car will keep
going in a straight line (over level ground) indefinitely. Unless, of
course, there is some force acting upon it to slow it down.


Dave Halliwell
Department of Geography
University of Alberta
Edmonton, Alberta
Newsgroups: sci.chem
From: ttt@cmr.no (Tore Tjomsland)
Subject: whiskey bottle
Organization: University of Bergen, Norway
Date: Mon, 31 Aug 92 12:06:49 GMT

Yesterday I was cleaning up the lab. I found a 
beautiful bottle. It contained a liquid, and was
marked: "platinum chloride".

As noted above, the bottle is beautiful, and I
want to use it in my private bar.

I therefore wonder if anyone has got health
data (oral) for the platinum chloride. Will it
be safe to drink from the bottle after a simple
wash? And have you got any good suggestions on 
how I should get rid of the platinum cloride? 

Thanks in advance!

Regards,

Tore Tjomsland
e-mail:	ttt@cmr.no
Newsgroups: sci.chem
From: cfthb@ux1.cts.eiu.edu (Howard Black)
Subject: Re: Azide Chemistry
Date: Mon, 31 Aug 1992 15:12:26 GMT
Organization: Eastern Illinois University

In article <y9gn-sn.ladasky@netcom.com> ladasky@netcom.com (John J. Ladasky II) writes:
>
>	To answer Steve's question: "Could you maybe displace a benzylic
>chloride or tosylate with azide in DMSO or liquid ammonia?"  Well, the par-
>ticular reaction in the paper to which I refer is the transformation of
>ethidium bromide, a commonly-available fluorescent stain of nucleic acids.

    As I mentioned in an earlier post, this method wouldn't work on an
aromatic amine.

>	BTW, here is the structure of ethidium bromide.  I find it inter-
>esting, given that the reaction would seem to occur at both of the amino
>groups, that the authors report reaction only at the amine marked with a
>* below.  (I'm at home and don't have the article in front of me, so I'm
>not sure how they know this.)  Perhaps writing out some resonance struc-
>tures would help to explain?
>
>	       ____	 ____
>	  *   /    \    /    \
>	H2N--<  ()  ----  ()  >--NH2
>	      \    /    \    /
>	       ----	 ----
>		   \    /
>		    ===N+ Br-
>	       ____/    \
>	      /    \     C2H5
>	     <  ()  >
>	      \    /
>	       ----

    Yup.  It's a question of both amine functions being meta to an
electron-withdrawing group.  The positively-charged nitrogen is just much
more electron-withdrawing than the -C=N+.

>	I am more interested in the general applications of adding azides
>to molecules, however, so if synthesizing something from scratch, I would
>certainly consider the safer method suggested by Steve.

    Steve's method is the one of choice for primary or benzylic carbons.
-- 
   ******************************************************************
     Howard Black                             cfthb@ux1.cts.eiu.edu
     Department of Chemistry                  Eastern Illinois Univ. 
Newsgroups: sci.chem