Carbon (13C) has a much broader chemical shift range.  One important difference is that the aromatic and alkene regions overlap to a significant extent.  We now see all the carbons, though quaternary carbons (having no hydrogens) are usually quite weak; the proton decoupling process gives rise to an enhancement that quaternary carbons do not experience. The reference point (0 ppm) is also the chemical shift of carbon in tetramethylsilane, (CH3)4Si. Here is a table of typical 13C chemical shifts: Chemical Environment of the Carbon 200+ 180 160 140 120 100 80 60 40 20 0 Alkane CH-CR3 10-50 Allylic, Benzylic, ketone =C-CH, Ph-CH, CH-C=O 40-55 Alkyne C=C-H 70-110 Alkyl halide CH-X 55-80 Ether/alcohol/ester CH-O 60-80 Acetals:  90-100 Nitriles, RC=N 110-120 Alkene =C-H 120-160 Aromatic Ph-H 125-170 Aldehyde, Ketone RC(=O)-H >200 Carboxylic Acid RCO2H and derivatives (esters, acid chlorides, amides, anhydrides) 165-190 200+ 180 160 140 120 100 80 60 40 20 0 Some examples Spectrum Structure & Notes tBuOH.jdx Note the 1:1:1 triplet at 77 ppm:  this is CDCl3 solvent.  The carbon couples to the deuterium (spin = 1) and creates this pattern. trimethylpentene.jdx ochlorobenzoic.jdx It is possible to predict which carbon is which based on additive substituent effects on each carbon. Those of you in CH 362 are learning how to do that.