Re: impurities in CDCl3

Marko Nieuwenhuizen wrote:

Hello,

I'm doing NMR measurements on diluted (0.1 mM) solutions in CDCl3. When I
do overnight measurements on my compounds, I'm seeing extra peaks at 6.0
(quartet) and 2.0 ppm (doublet), and now I'm wondering what compound this
might be. I was thinking it might be amylene, but the spectrum I found for
amylene doesn't match this.

The supplier doesn't have certificates of analysis online; I've sent an e-
mail but don't have a reply yet. Maybe someone in this group can help me
out in the meantime?

Chloroform is stabilized with ethanol. It decomposes, especially in
light with moisture, to phosgene and HCl.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf
.

Relevant Pages

  • Re: impurities in CDCl3
    ... do overnight measurements on my compounds, I'm seeing extra peaks at 6.0 ... : amylene doesn't match this. ... The spectrum is consistent with your extra compound being 1,1-dichloroethane. ...
    (sci.chem)
  • impurities in CDCl3
    ... I'm doing NMR measurements on diluted solutions in CDCl3. ... do overnight measurements on my compounds, I'm seeing extra peaks at 6.0 ... amylene doesn't match this. ...
    (sci.chem)
  • Re: impurities in CDCl3
    ... :> do overnight measurements on my compounds, I'm seeing extra peaks at ... I was thinking it might be amylene, ... Sieve dust seems to make the generation of HCl faster--presumably H2O ...
    (sci.chem)