C-13 NMR: Carbon- 13 NMR spectrum tells us… number of different carbon environments from
number of peaks AND types of carbon environments from chemical shift values.
Remember carbon as no splitting.
Chemical Environment: Carbon atoms bonded to different atoms (different chemical
environments) will absorb at different chemical shifts.
Symmetry: If two carbon atoms positioned symmetrically, they are equivalent and have same
chemical environment so contribute to same peak. Carbon bonded to same thing at same
distance.
Distance to Atoms: If carbon 1 bonded closer to oxygen atom than carbon 2, although falls in cc chemical shift, carbon 1 shifted more towards left than carbon 2.
Draw structure. Label chemical environments.
4 peaks so 4 carbon environments. One peak at δ = – ppm indicating —.