Hi there,

 

I have a question regarding a chemical produced by two different manufacturers, both of which claim it to be the structure seen in this image.

 

One of the NMRs is attached as a PDF, the other is inset.

 

To me, the one in the inset does not look like the same structure, but the PDF Does seem to match.

 

However, I am no NMR expert. My knowledge is very limited. Yet this seems fairly obvious.

 

Would anyone with some expertise here care to comment on the differences between these two NMRs?

 

 

 

 

 

cb2.pdf

 

Edited May 27, 201312 yr by jjgallow

I can only see one spectra, but the one I do see does not look right at all. There are too many peaks in the aromatic region and the integration is a little off. Have you looked through SciFinder or Reaxys (I'd go with the latter) for literature values for the spectra? It should help you.