HDTenEightyP/NetNews huggingface dataset:
From: ludwig@cat.de (Stefan Ludwig)
Subject: Searching for some olefines
Organization: C.A.T. Kommunikations-System
Date: Wed, 04 Nov 92 09:53:59 GMT

Hello out there,

can anyone of you help me to find out, where I can get
some olefines of the depicted general structures:

i)

     H2C=CH-(CH2)n-CH=CH-CH3  ; n>=2


ii)

     H2C=CH-(CH2)n-CH=CH-(CH2)m-CH=CH2   ;   n,m>=1



iii)

     H2C=CH-(CH2)n-CH-COOH
                   |
     H2C=CH-(CH2)m-CH-COOH          ;   n,m >=1



any comments on how they can be synthesized are also very appreciated.


Many thanks in advance

Stefan

---
  Stefan Ludwig (ludwig@cat.de)                     
  C.A.T. Kommunikations-System, Frankfurt, Germany
Newsgroups: sci.chem
From: toms@fcs260c2.ncifcrf.gov (Tom Schneider)
Subject: Re: Need help with ID'ing a chemical
Organization: Frederick Cancer Research and Development Center
Date: Fri, 6 Nov 1992 22:17:35 GMT

In article <1992Nov6.204532.25344@netcom.com> howard@netcom.com (Howard Berkey) writes:

>In college we had to work with a thiophenyl- substance and it actually
>had DANGER:Stench on the label.

I've worked with that stuff!  We got some for the early days of DNA synthesis
at the University of Colorado, (Caruthers was just across campus).  I ordered
some.  It came in a box.  I held the box in my arms and brought it down the
hall.  I stank from the smell then!  I opened the box.  It had vermiculite
in it, and inside that (I think) a metal container.  I opened that container
and found a sealed glass bottle...  The stuff is powerful...

  Tom Schneider
  National Cancer Institute
  Laboratory of Mathematical Biology
  Frederick, Maryland  21702-1201
  toms@ncifcrf.gov
From: sga@cray.com (Steven G. Anderson)
Newsgroups: sci.chem
Subject: Re: IBM PC chemistry program
Date: 11 Nov 92 16:26:04 GMT
Reply-To: sga@cray.com
Organization: Cray Research, Inc.

In article Ip4@cen.ex.ac.uk, cs90mdh@cen.ex.ac.uk () writes:
>
>I am going to write a package which could be used as a teaching aid in schools
>and possibly universities - a 3d molecular rendering program. ( Displays
>molecules with the 'ball and stick' model, which the user can pan around in
>real time )
>
>I would appreciate some feedback by chemistry teachers / would-be teachers
>as to the usefullness of such a package and for any ideas to be included. Any
>comments would be much appreciated, such as functionality within the package
>and the user-interface.
>
>(eg how important is a fast update, would shading be required, what 
>information would be useful to display with each atom/bond, would it be
>vital for students to use the package or could it just be demonstrated by
>the teacher etc...)
>
>Also, how would such a program fit in with current teaching methods
>( at schools, colleges or universities) ?

Try Snowbird Software's "The Electric Chemistry Building" written by Dr David
Santry of MacMaster University, Hamilton, Ontario, Canada.  I have a 12 year-old
who loves it.

Dr. Steven Anderson
Cray Research, Inc
Eagan, MN
Newsgroups: sci.chem
From: astley@franklin.cc.utas.edu.au ()
Subject: ChemDraw for IBM???
Organization: Chemistry Dept, University of Tasmania, Australia.
Date: Mon, 9 Nov 1992 22:12:58 GMT

Fellow netters, I have just purchased an IBM 486/33 DX clone. Now, I am about
to start writing my thesis up but want to be able to draw Chemical Structures
like it possible to do with ChemDraw on a MacIntosh....is there a similar
programme available for an IBM and would it happen to be shareware an which
ftp site is it on if it exists...

Thanking you all in advance,
Tim

--
Tim Astley      | Address : 1/16 Wallace Ave., Lenah Valley, Hobart,Tas. 7008
Chemistry Dept. |     or   astley@tasman.cc.utas.edu.au
Uni. of Tasmania|     or   phone (002) 202158 (work) (002) 280829 (home)
From: tomas_e@LINK.Physchem.KTH.SE (Tomas Eriksson)
Newsgroups: sci.chem
Subject: Re: Heavy water separation
Date: 6 Nov 92 17:50:58 GMT
Reply-To: tomas_e@LINK.Physchem.KTH.SE
Organization: Royal Institute of Technology, Stockholm

In article <1992Nov6.053218.5498@discus.technion.ac.il>, chmoris@techunix.technion.ac.il (Moris Eisen) writes:
>Well, Based on simple facts: water has a density of 0.998 gr/cc at STP 
>when heavy water is 1.104 gr/cc. Simple physiscs will explain whyheavy 
>water concentration will be larger at the bottom given enough time.

When conc. (D) >> conc. (1H), due to rapid proton exchange in water, all 
deuterium is present as HDO, monodeuterated ("half-heavy"?) water. The 
density of HDO is probably about 1.05 g/cm^3. (Note that it's impossible 
to get a pure sample of HDO, since it would become a mixture of about 
25% H2O, 50% HDO and 25% D2O - neglecting free energy differences between 
the three species which may promote >50% HDO or <50% HDO - very rapidly.)

The density of ethanol is about 0.8, but I haven't noticed the top layer 
of a vodka bottle being noticeably enriched in ethanol compared to the 
bottom... :-)

Tomas
-------------------------------------------------------------------------------
Tomas Eriksson                                          tomas_e@physchem.kth.se
            Surface Force Group, Department of Physical Chemistry,
               Royal Institute of Technology, Stockholm, Sweden

"These latter-day practitioners of surface chemistry reflect a lingering of the
adventurous spirit of the Enlightment" -- Charles Tanford
From: cs90mdh@cen.ex.ac.uk
Newsgroups: sci.chem
Subject: Re: IBM PC chemistry program
Date: 11 Nov 92 15:58:15 GMT
Organization: University of Exeter, UK.


>Why restrict the program to just PC's ...

I will use a back-end / front-end approach which will mean the program can be
easily converted to run on any other computer. I chose the PC as it's the
most widely used personal computer and I have one at home to develop on. An
amiga version is a possibility, although there are already some excellent
programs available ( Molec 3D and Chemesthetics are both brilliant ). Other
versions could be written by other programmers I suppose...

As I will not commence with the program design and implementation for a while
yet, I am still very interested in any ideas people have on my intentions. The
first response to my posting (thanks Gordon!) provided just the sort of ideas I
am after - I am not a Chemist or a teacher and therefore need feedback in order
to incorporate features that would really be useful.

[ For those who didn't catch my first post, I intend writing a program to be
used to teach molecular structure and bonding at schools/colleges/university
level. This will display a 3D image of a 'ball & stick' model of a molecule. ]



Thanks in advance for any more ideas,



				Mark.H.
Newsgroups: sci.chem
From: Gordon_Wong@mindlink.bc.ca (Gordon Wong)
Subject: Re: ORBITAL OVERLAP QUESTION
Organization: MIND LINK! - British Columbia, Canada
Date: Wed, 11 Nov 1992 05:09:37 GMT

Thanks for your reply, Howard.

I have another question that I've wondered about. Why is it that you can't
say
that the triple bond of N2 is formed from the overlap of the
mutually-perpendicular p orbitals on each nitrogen? Is this something they
teach to beginning students who do not know any better?
From: hendric@doc.ksu.ksu.edu (Richard Hendricks)
Newsgroups: sci.chem
Subject: Re: IBM PC chemistry program
Date: 10 Nov 1992 14:25:28 -0600
Organization: Kansas State University
NNTP-Posting-Host: doc.ksu.ksu.edu

cs90mdh@cen.ex.ac.uk writes:


>I am going to write a package which could be used as a teaching aid in schools
>and possibly universities - a 3d molecular rendering program. ( Displays
>molecules with the 'ball and stick' model, which the user can pan around in
>real time )
>Thanks in advance,

>				Mark.H.
Ever consider using an Amiga?  It already has many 3-d rendering programs 
availible.  
Newsgroups: sci.chem
From: saj@chinet.chi.il.us (Stephen Jacobs)
Subject: Re: Need help with ID'ing a chemical
Summary: A bit about thiols
Organization: Chinet - Public Access UNIX
Date: Fri, 6 Nov 1992 14:54:23 GMT

In article <1992Nov4.221903.9734@engage.pko.dec.com> moroney@ramblr.enet.dec.com writes:
>The compound in question, ethanethiol is the stink put into natural gas.
>One of the butanethiols is essence of skunk.

That isn't really right, although it gets the (pardon me) essence of things
right.  Warning agents for natural gas are mixtures: typically of C1 through
C4 thiols.  Methanethiol diffuses fastest, ethanethiol smells strongest and
butanethiol smells worst.  And skunk chemistry is more advanced than simple
mercaptans (I've seen some articles on it lately, but don't remember the 
results--probably sime ester groups involved too, though).

>
>I assume the other simple thiols stink as well.  Are any of them such
>as methanethiol or propanethiol the odors of something recognizable?

Well, at very VERY low levels, methanethiol is responsible for the scalded
taste in cooked milk.  Since this began with the formula C2H6S, it's fair to
mention that methyl sulfide has the aroma of canned corn at low levels, and of
molasses at higher levels.

                                 Steve        saj@chinet.chi.il.us
Newsgroups: sci.chem
From: hpv@kelvin.uio.no (Hans Peter Verne)
Subject: Re: IBM PC chemistry program
Organization: University of Oslo, Norway
Date: Wed, 11 Nov 1992 08:43:01 GMT


In article <BxIG3F.Ip4@cen.ex.ac.uk> cs90mdh@cen.ex.ac.uk writes:

>   I am going to write a package which could be used as a teaching aid in schools
>   and possibly universities - a 3d molecular rendering program. ( Displays
>   molecules with the 'ball and stick' model, which the user can pan around in
>   real time )
>
>   I would appreciate some feedback by chemistry teachers / would-be teachers
>   as to the usefullness of such a package and for any ideas to be included. Any
>   comments would be much appreciated, such as functionality within the package
>   and the user-interface.

One comment: If you take all the trouble to write such a program, 
why restrict it to pc's only ? You could include moduls to take 
care of the graphics on many different systems: mac, atari, 
amiga, X, tektronix, etc, and for writing
postscript files for a hardcopy...

Of course, this doesn't decrease the work ...  :)

Hugs,
Hans Peter.
Newsgroups: sci.chem
From: coizi01@convex.zdv.uni-tuebingen.de (N. Zimmermann)
Subject: [Q]: Conformational analysis with 2D/3D NMR?
Summary: Conformational analysis with NMR
Keywords: NMR, Conformation
Organization: Comp. Center (ZDV) U of Tuebingen, FRG
Date: Thu, 5 Nov 1992 12:40:22 GMT

Hi folks,

Is anyone interested in information exchange in the
field of NMR related computational chemistry?
Suggestions:
  
  - advantages of different computational strategies of 
	structure calculations e.g. DGII package versus DIANA 
	2.0 of Wuethrichs group versus restrained MD with amber 4.0

  - different experimental schemes for protein NMR.

  - new NMR processing software: e.g. Hare's FELIX vs. BRUKER UXNMR or
	Levi's NMR tools.

Here in Tuebingen, we're working with a BRUKER AMX400 and
UXNMR software for processing. Structures are calculated with
DIANA 2.0 and AMBER 4.0

Thank you for your response

Norbert Zimmermann
Institute of Organic Chemistry
University of Tuebingen
Germany
Newsgroups: sci.chem
Subject: Re: GRAVITY-NEUTRALIZING CHAMBER
From: asplundm@physc1.byu.edu
Date: 9 Nov 92 11:02:57 -0700
Distribution: world
Organization: Brigham Young University

In article <92311.014328SML108@psuvm.psu.edu>, <SML108@psuvm.psu.edu> writes:
> In article <1992Nov4.182739.2114@cnsvax.uwec.edu>, mcelwre@cnsvax.uwec.edu says:
>>
>>     The ZERO/REDUCED-Gravity Chamber described below has obvious potential
>>applications for Chemistry, allowing chemical processes, etc., which now can
>>ONLY be done on the Space Shuttle, AT GREAT EXPENSE.
> 
> I think I've figured Robert E. McElWaine "Super Genius" out...
> He is none other than the secret-identity of the Encyclopedia Brittanica
> guy...
> 
>>                                        Robert E. McElwaine
>>                                        B.S., Physics and Astronomy, UW-EC
>                                          Definitely BS...
> 
> Robby, do you do requests?  I want to know how to turn gold into lead...
Actually, we figured out how to do this one time.  All you need is a good
particle accelator, and a lot of time.  We figured that given a month
or two you could get a pretty good (5 to 10% enrichment).  It would be 
much more expensive than just going down to the jewelery store.

Matt Asplund
matt%iodine@cchem.berkeley.edy
From: bjgaed@bb1t.monsanto.com
Newsgroups: sci.chem
Subject: Re: peroxides/explosions
Date: 6 Nov 92 07:37:32 CST
Organization: Monsanto Company, St. Louis, MO

In article <1992Nov4.102151.57910@qut.edu.au>, frost@qut.edu.au writes:
> Re: peroxides
> 
> I am seeking information on icidents/accidents which may 
> have occured because of organic peroxides or similar 
> potentially dangerous chemicals.
> Basically I am looking for examples in order to present a 
> case for a new chemical store/ waste transfer station for 
> the faculty of science at our university.
> 
> Any comments or examples would be much appreciated.
> 
> Ray Frost
> Frost@qut.edu.au

The best reference for this type of thing is _Handbook of Reactive 
Chemical Hazards_ by R. L. Bretherick (Butterworths).  It lists 
materials in two sections:  one by name and the other by class.  So 
you can look up "t-Butyl Hydroperoxide" in the first section or 
"Organic Peroxides" in the second.  There will be a short monograph 
and references to the primary literature that should include case 
studies and research papers.  


--Electric Monk            (Bruce Gaede); 
                            e-mail: bjgaed@ccmail.monsanto.com

"...and then time started seriously to pass."
--Douglas Adams, _Dirk Gently's Holistic Detective Agency_
Xref: sparky sci.chem:4505 comp.ai.neural-nets:4220
Newsgroups: sci.chem
Subject: NSTA certification info?
From: chem@uwpg02.uwinnipeg.ca
Date: 8 NOV 92 10:45:42 CST
Organization: University of Winnipeg

Hi. For the high-school Chem teachers in the group, have
any of you been NSTA (National Science Teachers' Association)
certified? If so, what are the advantages to it and how is it
accomplished? Thanks for any info. Marsh
Internet: CHEM@UWPG02.UWINNIPEG.CA
From: earprl@vtcc1.cc.vt.edu (Ron Earp)
Newsgroups: sci.chem
Subject: Excitons and Near Field Phenomenon, QUESTIONS!
Date: 10 Nov 92 13:44:00 GMT
Organization: Virginia Tech, Blacksburg, Virginia
News-Software: VAX/VMS VNEWS 1.41



Hi,
   I would like to know if anyone out there has any information on excitons and "near-
field" light sources. There is an article in the C&E News (Nov 2, 1992) that describes
a pH sensor that is related to this concept. I am also interested in knowing if excitons 
and evanescent fields are similar or have anything to do with one another. Thanks for
any help that you can give me.

-Ron
VPI&SU, L.A.I.D. Group
From: det@phlan.sw.stratus.com (David Toland)
Newsgroups: sci.chem
Subject: Re: Gold dust a fire hazard?
Date: 13 Nov 92 13:44:06 GMT
Organization: Stratus Computer, Software Engineering
NNTP-Posting-Host: phlan.sw.stratus.com

In article <1992Nov13.033411.22073@dsuvax.dsu.edu> rolfe@dsuvax.dsu.edu (Tim Rolfe) writes:
>I thought gold was so UNreactive that even concentrated nitric acid
>by itself doesn't bother it --- you need aqua regia.  Given this, I
>do find it surprising to hear that gold can be oxidized, even finely
>divided.

I`ve been mildly curious about this also, so I finally looked in my CRC.
There is an oxide listed, Au2O3, but it *LOSES* oxygen as you heat it,
so oxygen combustion seems unlikely to me.  I don't see a nitride, but
wouldn't really expect that would be very likely anyway.  Possibly it
would inflame with halogens when finely divided, but I don't know if
that would give it a flammability hazard rating.

Probably the manufacturer is deciding to err on the side of caution,
as MOST finely divided metals can combust explosively.

A few years ago, BTW, I did some work with lithium dispersion.  You can't
even expose it to an N2 atmosphere (it burns to lithium nitride).  We
worked with in an Ar filled glovebox.  And lithium is tame among the
alkali metals!


-- 
det@phlan.sw.stratus.com   |  "Laddie, you'll be needin' something to wash
                           |  that doon with."
Newsgroups: sci.chem
From: moroney@ramblr.enet.dec.com
Subject: Re: Heavy water separation
Organization: Digital Equipment Corporation
Date: Wed, 11 Nov 1992 18:48:14 GMT

Question on a 'different form' of heavy water:

Does H O-18 (water with normal hydrogen but the oxygen-18 isotope) behave
      2
more like normal water or heavy water in its melting point, boiling point,
density, biological effects etc?  It has the same molecular weight as
D O.  How about "superheavy water", D O-18?     T O-18 anyone?
 2                                   2           2

-Mike
Newsgroups: sci.fractals
From: shirriff@sprite.berkeley.edu (Ken Shirriff)
Newsgroups: sci.fractals
Subject: Re: (x)fractint authors please read
Date: 12 Nov 1992 20:25:55 GMT
Organization: University of California, Berkeley
NNTP-Posting-Host: hijack.berkeley.edu

In article <1992Nov12.182116.5976@bnr.ca> yavuz@bnr.ca (Yavuz Onder) writes:
>1. my postscript image comes out with 00 and FB as gray levels

The problem is that colors in fractint range from 0 to 63, and are
multiplied by 4 to get the postscript values.  63x4=FB.  It should probably
be multiplied by 4.0635 to scale correctly.
 
The reason epsf=0 results in a .eps file is that some parameters are changed
whenever you change the epsf value, no matter what you change it to.  This
is probably a bug.

You could define a new value of the postscript resolution to indicate device
resolution, such as -1.  Just fix the documentation appropriately.

>I can suggest fixes for last three as I have already corrected them on
>*.eps files and tried successfully

If you send me fixes for the problems, I'll add them to xfractint eventually.
Unfortunately I don't have much time to spend on xfractint now, so the fixes
will get installed sooner if they are straightforward (e.g. patch files).

Ken Shirriff				shirriff@sprite.Berkeley.EDU
Newsgroups: sci.fractals
From: mrmarcel@eos.ncsu.edu (MICHAEL RONN MARCELAIS)
Subject: Lorenz' Weather
Organization: North Carolina State University
Date: Wed, 11 Nov 1992 23:09:38 GMT

Does anybody have the equations that Lorenz used in his old weather program? 
It was the first time he noticed the 'sensitive to initial conditions'
phenomenon that started research into Chaos.  The program is mentioned in the
_Chaos_ book by Gleich (i think) but not the equations.

Thanks.

-- 

+-------------------------------------+------------------------------+
|  Mike Marcelais                     | mrmarcel@eos.ncsu.edu        |
|  356 Tucker, Box 04783, NCSU        | Fourth Bryan Productions     |
|  Raleigh, NC  27607                 | #include <disclaim.h>        |
+-------------------------------------+------------------------------+
| if the above address bounces, then try the address below:          |
| mrmarcel%eos.ncsu.edu@ncsuvx.ncsu.edu                              |
+--------------------------------------------------------------------+
From: alain@elevia.uniforum.qc.ca (W.A.Simon)
Newsgroups: sci.fractals
Subject: yet another newbie
Date: 05 Nov 92 00:16:18 EST

Greetings brothers and sisters of the glazed eye tribe!

I am sick and tired of booting MSDOS just so I can run
FRACTINT...  isn't there a *nix package out there?
Where can I get it (FTP maybe)?

Considering the poor service we get around here, at
the extreme ends of the flooding algorithm capilaries,
it may be best if you e-mail me your answer (post as
well for the benefit of others...).

BTW, while we are at it, is there a FAQ file I can get
also?

Thank you.


--
 Alain
 [ ... usual disclaimer... ]
From: bert.tyler@satalink.com (Bert Tyler)
Newsgroups: sci.fractals
Subject: Winfr173 and GIF
Date: 13 Nov 92 10:02:00 GMT
Reply-To: bert.tyler@satalink.com (Bert Tyler)
Organization: Datamax/Satalink Connection * Ivyland, PA (215) 443-9434

BH>Why would a normal GIF (ex NASA mars1 photo) display ok with Fractint 17.2
BH>but not come out right (loses color?) when attempt to display it using
BH>Winfr173 ?

Probably because your Windows video driver takes away some of the
colors for its own use.

The "standard VGA" Windows video driver uses only 16 colors, and they
can't be altered.  Even a "256-color" Windows video driver reserves
20 colors for its own use, and only lets application programs such as
Winfract alter the other 236.   ("True-color" Windows video drivers 
let applications programs set their colors at will.)

Winfract doesn't attempt to dither its internal colors into a scheme
that accounts for the above limitations (who knows what those
limitations will be under Windows 3.2?).   It just hands its
device-independent bitmaps over to the Windows video driver and says,
in effect, "here - display this".  The Windows video driver then
typically attempts to reduce Winfract's palette into one that matches
the available colors using a "best fit" approach that doesn't always
fit so well.  My 256-color Windows driver, for example, often 
matches the last 20 colors to a stylish solid-black <grin>.

                   Bert Tyler   (bert.tyler@satalink.com)
---
 . DeLuxe./386 1.25 #343sa . Did you expect mere proof to sway my opinion?
From: scavo@cie.uoregon.edu (Tom Scavo)
Newsgroups: sci.fractals
Subject: Re: Mappings with singular points
Date: 12 Nov 92 22:34:52 GMT
Article-I.D.: nntp.1992Nov12.223452.8432
Organization: University of Oregon Campus Information Exchange

In article <1992Nov8.234155.14813@mnemosyne.cs.du.edu> ddixon@nyx.cs.du.edu (David Dixon) writes:
>Is anybody aware of any differences between mappings with and without
>singular points?  For example, say I have a map x[n+1] = f(x[n]), where
>df/dx is singular at some point.  Does this show any behavior not seen
>in maps involving analytic functions?  References would be greatly
>appreciated.

I'm not sure what you mean by "singular," but you may enjoy studying
the dynamics of  L(x) = log|x-1|  on the real line.  I haven't looked
at it in the complex plane, though (heck, I'm not even sure it makes
sense in the plane!).

-- 
Tom Scavo
scavo@cie.uoregon.edu
From: achamber@cs.weber.edu (Tony Chamberlain)
Newsgroups: sci.fractals
Subject: Gif Dimensions
Keywords: Gif
Date: 5 Nov 92 15:39:31 GMT
Organization: University of Utah Computer Center

Hi, I have recently discovered a gif site of mandelbrot pictures at 
iraun1.ira.uka.de.  In this site they post their gifs as aafaa(or 2af2a for
short) meaning the ath subset of the ath subset of the fth subset of the ath
subset etc. ad infinutum(some of those things are 4afc6d!).
I assmume that the original mandelbrot set is split up into x number of 
squares(I've seen i as the biggest letter so far.)  My question is there 
any set formula for these letters or a table somewhere.  Or can anyone direct
me to the email address of those posting the  gifs and i can contact them 
directly. 
Basically I want to explore some of the areas the gifs represent

Thanx for any info,
Tony Chamberlain,
achamber@cs.csulx.edu