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It isn't an alcohol (you are told that in the question and so there must be another carbon on the right-hand side of the oxygen in the structure in the last paragraph. This is also known as 3-buten-2-one (amongst many other things!). The electron pulling effect of the oxygen atom increases the chemical shift slightly from the one shown in the table to a value of about.

NMR, spectroscopy - Department of Chemistry

The two peaks around 130 must be the two carbons at either end of a carbon-carbon double bond. C H3CO-, but replacing one of the hydrogens by a simple CH3 group won't make much difference to the shift value.

NMR, table - Michigan State University

The R is the rest of the molecule. A simplification of the table, you may come across a simplification of the above table which is useful in easy cases just to pick out the main types of carbon environments in a compound: carbon environment chemical shift (ppm c-C 0 -.

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Inductive deshielding effects of electronegative substituents are roughly additive, as the following data suggests. It can't be an acid because there has to be a carbon attached to an oxygen by a single bond somewhere - apart from the one in the -cooh group. D would only produce two peaks. Without this information, though, you could probably come up with reasonable alternative structures. Example 4 Using the simplified table of chemical shifts above, work out the structure of the compound with the following C-13 NMR spectrum.

NMR ) - Yahoo Finance

Now let's make it a little more difficult - but we'll work from much easier examples! C-O 50 - 100, cC,. But they aren't all the same height.

NMR spectra - chemguide

The three right-hand peaks, from the simplified table, all you can say is that these are due to carbons attached to other carbon atoms by single bonds. H t-butyl methyl ether.19 s 3, c(C, h 3)3.22 s 1 O-C H 3 ethyl acetate.26 t 3 CH2C H.05 s 3 (CO)C H.12 q 2 OC H 2CH3 grease or alkanes.86 m varies;. Solvent 1H Shift Multiplicity 13C Shift Multiplicity* Acetone- d.05 pent 206.68 sing.92 sept Acetonitrile- d.94 pent 118.69 sing.39 sept Benzene- d.16 sing 128.39 trip Chloroform-.27 sing.23 trip D2O.80 - Dichloromethane- d.32. There are four carbons in the molecule and four peaks because they are all in different environments. The approximations are perfectly good, and we will work from this table: carbon environment chemical shift (ppm) C-C 0 - 50 C-O CC CO There is a peak for carbon(s) in a carbon-oxygen single bond and one for carbon(s) in a carbon-carbon single bond.

Typical values for carbon

If it was an acid, you would already have used up both oxygens in the structure in the -cooh group. Let's sort out what we've got.