Shoolery's rule, which is named after James Nelson Shoolery, is a good approximation of the chemical shift δ of methylene groups in proton nuclear magnetic resonance. We can calculate shift of the CH2 protons in a A–CH2–B structure using the formula

where 0.23 ppm is the chemical shift of methane and the empirical adjustments S are based on the identities of the A and B groups:

SubstituentS / ppm
–CH30.47
–COOR1.55
–COR1.70
–C6H51.83
–SR1.64
–I1.82
–Br2.33
–OR2.36
–Cl2.53
–OH2.56
–OCOR3.13


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