MagicJigPipe - 14-3-2008 at 20:02
My Mom went to the auctions the other day and came back with (amongst many other things) 2 cans of Sealed Air -Instapak Port Cleaner. They contain:
Diisobutyl glutarate (CAS 71195-64-7), diisobutyl adipate (CAS 141-04-8), diisobutyl succinate (CAS 925-06-4) and carbon dioxide propellant.
For some reason when I looked up the MSDS for the cleaner it claimed to contain gamma-butyrolactone! I assume it was an old MSDS and they simply
changed their formula as per the list 1 status of the lactone.
Anyway, my question is, does anyone know what these solvents can be used for in the lab? Are they worthless? I find them interesting because I have
never heard of them before.
not_important - 14-3-2008 at 21:39
Dieasters are decent solvents, but as esters they are relatively reactive, and they have high boiling points. This mixture, possibly with a different
ratio of esters, is sold as DBE-IB, used in coatings as a slow evaporating (tail) potion of the solvent base, helping form continuous films without
pinholes.
The acids themselves could be useful, as could be the isobutyl alcohol. Succinic acid can be converted to the cyclic imide, which is reacted with Cl2
or Br2 to give NCS or NBS (N-ChloroSuccinimide, N-BromoSuccinimide)- useful halogenating agents (Wiki has an OK write-up).
here's the MSDS
Attachment: Instapak Port Cleaner.pdf (60kB)
This file has been downloaded 6635 times
MagicJigPipe - 15-3-2008 at 00:41
Yes, isobutanol. That's not something I hear about too often and would love to have some if not for anything than to just be able to say I have it.
Thanks for the info!
Separating the acids would prove difficult wouldn't it? I think my best bet would be to keep the acids mixed or discard them.
not_important - 15-3-2008 at 01:35
All depends, as they have their uses.
If you've the equipment to fractionally distill under reduced pressure, then you could fractionate the esters.
If not, then you can use other physical properties to separate them. Glutaric acid is 10 times as soluble in water as succinic, and about 40 times
more soluble than adipic; fractional crystallization should give decent separation.
Take the free acids and drop them in toluene or xylene along with a few mole-percent of boric acid. Arraign for slow distillation of the
aromatic-water azeotrope, distill that off with return of the solvent to the pot. Succinic and glutaric acids for cyclic esters, adipic does not
although it can form polymeric esters. The anhydrides have much different physical properties than the dibasic acid, some research should give you
enough information to separate succinic anhydride from adipic acids and its oligimers.
Di-esters of adipic acid can undergo a Dieckmann condensation to give the cyclopentane b-ketoester. This is useful synthetically, or can be
decarboxylated to cyclopentanone, which can be transformed into cyclopentanol, cyclopentene, cyclopentane, and indirectly into cyclopentadiene.
Glutaric acid can be reacted with ammonia, the heated to give glutarimide which with some effort can be made into piperidine or pyridine.
chemrox - 16-3-2008 at 00:31
I'm using high boiling esters to charge my manostat.