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Article #69

Re: technical challenge: CH2 target.

#69
From: "Alan \"Uncle Al\" Schwartz"
Date: Wed, 11 Dec 1996 00:00
34 lines
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Jean-Sebastien Graulich <Graulich@fynu.ucl.ac.be> wrote:
>
>It's quite easy to get either CD2 target or pure H2 gas, but,
>up to now, nobody has been able to provide us with a pure CH2
>target. Does someone know how to produce some?

[Moderator's Note : Unnecessary quoted material deleted. -WGA]

If you really wanted to...

Start with calcium carbide.  Hydrolyze with D-depleted water to make 
D-depleted acetylene.  Hydrogenate with D-depleted H2 to make 
D-depleted ethylene, then Zieglar-Natta that to D-depleted polyethylene. 
Form with heat (140 C maximum ought to do it) in a press between sheets 
of aluminum foil.

I suppose another route would be to exhaustively exchange a diazomethane 
precursor with D-depleted water to get the D out, Then generate 
diazomethane and polymerize to polyethylene with light or copper.  Try to 
avoid blowing up the lab, or killing yourself by inhalation, or giving 
yourself cancer.

If all you need is waxy, film-forming stuff, maybe you could 
exhastively hydrogenate a large condensed polycyclic hydrocarbon to fused 
cyclohexane rings (probably rhodium catalyst).  That could get your D/H 
ratio down by a factor of maybe 3.

-- 
Alan "Uncle Al" Schwartz
UncleAl0@ix.netcom.com ("zero" before @)
http://www.ultra.net.au/~wisby/uncleal.htm
 (Toxic URL! Unsafe for children, Democrats, and most mammals)
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From: "\"Alan \\\"Uncle Al\\\" Schwartz\"" <uncleal0@ix.netcom.com>
Subject: Re: technical challenge: CH2 target.
Date: 1996/12/11
Message-ID: <58nnn5$o00@pulp.ucs.ualberta.ca>
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newsgroups: sci.polymers,be.science,sci.physics.research,sci.physics,sci.physics.accelerators,sci.chem,sci.research
originator: anderson@blossom