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Alkanes

1HNMR

Protons on carbons attached to an oxygen fall in the range of 3-4.3 ppm.  For example, the proton on the carbon attached to the oxygen is 2-butanol has a chemical shift of 3.8 ppm.  An O-H proton can be in the range of 0.5 to 5 ppm and is dependent upon concentration and temperature.

 

 

13CNMR

Carbon chemical shift is much more affected by alkyl substitution than HNMR. Methyl carbons  8 – 30 ppm, secondary carbons between 15 – 55 ppm, and tertiary/quaternary carbons 20-60 ppm. Below is the CNMR spectrum for 2,2-dimethylbutane.