APO
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Lithium Aluminum Hydride / Lithium Hydride recovery from Tetrahydrofuran solution?
A while back I was reading on here about reducing agents. Along the way I came across a thread that stated Lithium Aluminum Hydride and Lithium
Hydride cannot simply be separated from a Tetrahydrofuran solution by evaporation, that it formed a complex similar to Lithium Bromide in N-Butyl
Lithium or Methyl Lithium. It listed some method of precipitating the Lithium Aluminum Hydride or Lithium Hydride back out of the Tetrahydrofuran,
somewhat similar to forcing Hexanitrohexaasaisowurtzitane out of Ethyl Acetate with Chloroform but without adjusting it's form. Is it true that
Lithium Aluminum Hydride and Lithium Hydride can't easily be separated from Tetrahydrofuran once dissolved? Is it true that they form a complex of
some sort? If not, can they be separated by simple evaporation, say under a vacuum environment?
[Edited on 17-9-2013 by APO]
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kristofvagyok
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LiH is almost insoluble in tetrahydrofuran, while LiAlH4 is well soluble, so the separation is easy, just filter it.
Just a comment: if you write sentences without abbreviations, e.g.: you write lithium aluminium hydride instead of LAH, or just LiAlH4, than it
could be much more easily interpreted by others...
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APO
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No, I meant getting back either of them out of separate solutions, not from a mixture. I heard once they're dissolved that they're difficult to get
out.
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bfesser
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Abbreviation or Ignorance
IIRC — <em>If I Recall Correctly</em>
LAH — <a href="http://en.wikipedia.org/wiki/Lithium_aluminium_hydride" target="_blank">lithium aluminium hydride</a> <img
src="../scipics/_wiki.png" /> <em>(easy enough to just write LiAlH<sub>4</sub> </em>
LH — <a href="http://en.wikipedia.org/wiki/Lithium_hydride" target="_blank">lithium hydride</a> <img
src="../scipics/_wiki.png" /> <em>(properly abbreviated LiH)</em>
THF — <a href="http://en.wikipedia.org/wiki/Tetrahydrofuran" target="_blank">tetrahydrofuran</a> <img
src="../scipics/_wiki.png" />
Sometimes I think that people who abuse abbreviations use them because they don't rightly know what they stand for. Unless you're one of those people
(I despise) who type only with their index fingers, it wouldn't kill you to just write out what you mean. If you are one of those people, it takes a
week maximum to learn to type properly—an invaluable skill. I don't understand the excuses of the elderly, either... the computer keyboard
is based on the typewriter layout. Nobody is still alive who was born before the invention of the typewriter (they would be approximately 150 years
old).
</disgruntled rant>
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bfesser
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Thread Moved
16-9-2013 at 14:45 |
APO
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Sorry I didn't know that abbreviations are such a big deal, many threads on here have them in great abundance, so I figured since I was feeling a bit
of carpel tunnel from writing an essay for school, that using some acronyms wouldn't be such a bad idea. Anyway, I edited my initial post, and
elaborated what I recall reading, and I included some examples that they reminded me of.
"Damn it George! I told you not to drop me!"
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bfesser
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No worries, I'm just a bit cranky today—trying to set up a server to seed the latest forum backup, and failing. Please don't take my post
personally, it's merely my grudge against laziness in general. Acronyms are fine, but it's best to define them before use; unless they're ubiquitous
chemistry acronyms that everyone here should know (e.g. THF).
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APO
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It's fine, my whole lab was recently confiscated by the police, along with most of my personal belongings such as my computer, camera, phone, and
about two grand worth of chemistry/engineering supplies and equipment for my projects. Not to mention countless issues brought on by this. Long story
short, I get it since I got a lot on my plate too.
"Damn it George! I told you not to drop me!"
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Bot0nist
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Why? How old are you, if you dont mind me asking? My limited experiance with law enforcment officers has varied greatly from that. Must be the
circumstances...
Sorry to go OT, but that subject intrests me currently
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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APO
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Me and my sister got in a fight, I was covered in blood and in need of medical attention, once the police arrived after I called 911, they saw
everything in my room and suspected I was running a meth lab, so they called in the hazmat team. After five weeks of scrupulous testing they found no
evidence of any illegal activities. They insisted it was a hazard, once I told them my safety procedures, they said it was inappropriate. It's been
over six weeks without my lab equipment, computer, camera, phone, and other confiscated items. I just turned fourteen late last month.
"Damn it George! I told you not to drop me!"
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