Help using NMR/IR to identify an unknown?

You are right with what you had written on the 1H spectrum - it's propyl acetate (CH3COOCH2CH2CH3). The shifts for this compound from SDBS are:

1H: 4.023 (t), 2.050 (s), 1.65 (m), 0.95 (t) ppm (it doesn't matter that these are out by ~0.05 ppm)

13C: 171.09, 66.10, 22.14, 20.91, 10.41 ppm

and the IR spectrum matches. The funny peak in the IR that you couldn't identify IS CO2 btw.

Do you have the mass spec for the compound?

Also, the images are a bit unclear so its hard to see the integrals/shifts/splitting for the 1D NMR.

Edit: It doesn't appear to be methyl butyrate as the 13C NMR spectra doesn't match methyl butyrate's. The peaks at 77ppm should be lower at 50ppm. Also did you degas the system because the 2300 wavenumber peak on the IR spectra looks an awful lot like a CO2 peak. The intensity doesn't match but it at a spot where CO2 should appear.

Edit2: I am pretty sure that the 2300 peak in the IR spectra is just CO2. If you look at the transmittance, it is really low. You must have had a VERY dilute sample.

Ooh, I feel for you. We had the same problem when we were trying to defend our products in organic synthesis, but at least we knew what we were looking for. I think you should find a more detailed correlation table. The organic synthesis book that I have here at home only has a simplified one, and summer break has started so I can't check the library. Have you considered a nitrile group? Ideally, it's only around 100cm-1 from the IR absorbance of your weird peak.

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