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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: captainmatt311 on October 18, 2010, 06:45:45 PM

Title: NMR Charts. Please help me confirm my compound
Post by: captainmatt311 on October 18, 2010, 06:45:45 PM
Hi i have a couple of NMR and IR charts etc. that i received in my lab and i was just wondering if anyone could look over these and see if i identified my unknown compound correctly.
The second and third pictures are just close ups of the whole chart.

I think the compound is.. H-C=0-CH2-CH2-Ch2-CH3...Butyraldehyde


Thanks for your help
Title: Re: NMR Charts. Please help me confirm my compound
Post by: willug on October 18, 2010, 07:11:28 PM
If you have a known compound, then it's always a good idea to compare with the literature. Sigma Aldrich has a lot of NMR and IR data on its website. Check here; http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=20710|FLUKA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC for your aldehyde..
Title: Re: NMR Charts. Please help me confirm my compound
Post by: MissPhosgene on October 18, 2010, 10:54:22 PM
Integration can also help you make structural assignments.
Title: Re: NMR Charts. Please help me confirm my compound
Post by: discodermolide on October 19, 2010, 03:47:52 AM
Quote from: MissPhosgene on October 18, 2010, 10:54:22 PM
Integration can also help you make structural assignments.
The spectra are integrated.

Your suggestion for butyraldehyde seems ok
Title: Re: NMR Charts. Please help me confirm my compound
Post by: AWK on October 19, 2010, 04:52:22 AM
3 x CH2 groups are in valeraldehyde (pentanal)
Title: Re: NMR Charts. Please help me confirm my compound
Post by: MissPhosgene on October 19, 2010, 11:28:22 PM
Quote from: discodermolide on October 19, 2010, 03:47:52 AM
Quote from: MissPhosgene on October 18, 2010, 10:54:22 PM
Integration can also help you make structural assignments.
The spectra are integrated.

Your suggestion for butyraldehyde seems ok

Yeah, underneath. I looked on top of the peaks because I'm used to seeing them there and ppm below the peaks. Thanks!