Alcohols

¹HNMR

Protons on aliphatic (alkyl) groups are highly shielded and fall in the range of 0.7 to 1.5 ppm.  The less substitution the more shielded the proton.  About 0.2-0.4 ppm for each additional alkyl group. Below are the HNMR, CNMR and IR spectra for 2-butanol.

2-butanol_HNMR

¹³CNMR

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

2-butanol_CNMR

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FTIR

Again this is one of the four simple IR absorbances I taught you. Alcohols have strong broad adsorbance between 3200-3500cm^-1. Below is the FTIR spectra for 2-butanol.

2-butanol_IR