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Explanation / Answer

A table of typical chemical shifts in C-13 NMR spectra

carbon environment chemical shift (ppm) C=O (in ketones) 205 - 220 C=O (in aldehydes) 190 - 200 C=O (in acids and esters) 170 - 185 C in aromatic rings 125 - 150 C=C (in alkenes) 115 - 140 RCH2OH 50 - 65 RCH2Cl 40 - 45 RCH2NH2 37 - 45 R3CH 25 - 35 CH3CO- 20 - 30 R2CH2 16 - 25 RCH3 10 - 15


carbon environment chemical shift (ppm) C-C 0 - 50 C-O 50 - 100 C=C 100 - 150 C=O 150 - 200

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