Natural Science Forum / Chemistry / Organic Synthesis / July 2005

What is the purpose of adding sodium chloride to a caffeine solution
after suction filtration and just before extraction with chloroform in
a separatory funnel? I would be grateful for a reply.

can anybody suggest me the viable synthetic route for CHLORZOXAZONE

We hope we could found a more friendy solvent to replace LIAV. We are
using it to solute silicone. Have you any suggestions?
Thank you for your help in advance!
Johanna

I've synthesized 4, N, N-triethylbenzamidine and performed a
sublimation at 90 C (the sample 100mg sublimed within ~10 minutes)to
eliminate impurities. However, it did not get rid of all the
impurities. Then we tried it at 50 C, which took a lot longer, and the

I am trying to analyze the concentration of iodine in Iodixanol (see
molecule in the following link)
http://dmd.aspetjournals.org/cgi/content/full/27/10/1205/F1
The analysis that I am developing is the determination of this iodine

I am trying to do some gas separation work on a small scale package
synthisis plant and I have noted that medical oxigen concentrators seem
to be very common and relativly reasonably priced since I'm trying to
seperate hydrogen from nitrogen I figure the process should work quite

Is there any easy way to reduce sulphuric acid to pure sulphur? Or maybe
a sulphate, like copper sulphate into sulphur?

In a paper from 1904 in German, there were some units I could not
figure out.
1) 12 Be- (- was on top of the e)
2) 1/n NaOH