Process NMR

Chemical Shift Table 1

Proton NMR Assignments for Functional Groups of Interest in Petroleum Chemistry.
Peak Position*Assignment (comments)
0.5 - 1.0CH3 gamma and further naphthenic CH and CH2 seperation at 1.0 ppm is generally not base resolved.
1.0 - 1.7CH2 beta and further. Some beta CH. Separation at 1.7 ppm is generally not base resolved.
1.7 - 1.9Most CH, CH2, beta hydro-aromatic. This shoulder is one of the best available ways to estimate hydro-aromaticity.
1.9 - 2.1CH3 alpha to aromatic carbons. Separation at 2.4 ppm is generally not base resolved.
2.4 - 3.5CH, CH2 alpha to aromatic carbons.
3.5 - 4.5CH2 bridge (diphenylmethane)
4.5 - 6.0Olefinic-H
6.0 - 7.2Single ring aromatic H.
7.2 - 8.3Diaromatic and most of tri and tetra-aromatic.
8.3 - 8.9Some tri and tetra-aromatic rings.
8.9 - 9.3Some tetra-aromatic rings.
* Referenced to TMS (tetramethylsilane) at 0 ppm (units = ppm)
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