[AMARACHUKWU]

i am a postgraduate student of organic chemistry with little knowledge of characterisation and interpretations of nmr spectra . i need help.

[sjb]

How did you study this at undergraduate level - e.g. what were your course books, what did you cover (just proton and carbon, or other nuclei as well?)

[AMARACHUKWU]

just proton and carbon.

[AMARACHUKWU]

I need help in identifying the molecule

[Babcock_Hall]

It is a forum rule that you must show your attempt before we can help you.  What are your thoughts?

[wildfyr]

That proton nmr is poorly phased. Secondly is this a real reaction where you synthesized something? If so, you should state the starting materials and desired product. It makes interpretation much easier. And it a forum rule that you must give us your attempt.

[wildfyr]

Looking again, I don't think this nmr is locked. The peaks are in an unusually downfield part of the spectrum, and poorly resolved. It's in cdcl3 and I see no clean cdcl3 singlet.

[hypervalent_iodine]

Looking again, I don't think this nmr is locked. The peaks are in an unusually downfield part of the spectrum, and poorly resolved. It's in cdcl3 and I see no clean cdcl3 singlet.

Look at the carbon. I don't think that's CDCl3. Looks like someone locked to the wrong solvent. Maybe CD3OD?

[AMARACHUKWU]

That proton nmr is poorly phased. Secondly is this a real reaction where you synthesized something? If so, you should state the starting materials and desired product. It makes interpretation much easier. And it a forum rule that you must give us your attempt.

this is a product I got from the isolation of camwood extract. (Baphia nitida) using the traditional column.

[hypervalent_iodine]

That proton nmr is poorly phased. Secondly is this a real reaction where you synthesized something? If so, you should state the starting materials and desired product. It makes interpretation much easier. And it a forum rule that you must give us your attempt.

this is a product I got from the isolation of camwood extract. (Baphia nitida) using the traditional column.

What solvent did you use to prepare the NMR sample?

[AMARACHUKWU]

What solvent did you use to prepare the NMR sample?

chloroform

*MOD EDIT - monster quote*

[wildfyr]

I have trouble believing there is no alkyl content to this molecule as is implied by the NMR. Thats why I suspect its poorly locked. It just looks like a generally poorly taken NMR. Try asking someone who is experienced in using it to lock and shim it. Also... when you say chloroform, you mean CDCl₃ right?

[AMARACHUKWU]

*MOD EDIT - monster quote*
yes. i just spoke with the lab where the analysis was done and they said thats the much they can do.

[wildfyr]

I just can't get your proton, carbon, and IR to jibe. Proton shows broad, polymer-like peaks, all above 5. Carbon shows a bunch of clean singlets, and only about half of them are in the aryl. FTIR shows a peak at 2952 cm^-1 which indicates alkyl content, but no carbonyl is seen. However the carbon shows what looks like an ester at 175ppm.

My definitive response to the claim that no one screwed up is that there is no triplet at 77.2 ppm on the ¹³C NMR, which is characteristic of CDCl₃. So ask them to run it again, and this time not be lazy jerks and actually lock and shim it.

[AMARACHUKWU]

 thank you. i will tell them to run it again and get back with thr results

*MOD EDIT - monster quote*