High-resolution nuclear-magnetic-resonance spectra of hydrocarbon groupings

Previous studies on 13CH satellite features in the hydrogen nuclear-magnetic-resonance spectra of symmetrical molecules are extended to include the complex spectrum of liquid propane (CH3CH2CH3). The exact Hamiltonian for the nuclear system A3B2A3' and its simplification using group theoretical methods are described. A precise solution of the spectrum at 40 Mc/s, aided by the satellite features, is presented; the values of the AB chemical shift and AB coupling constant which produce the best agreement between experimental and theoretical spectra at 40 Mc/s are 17·50±0·05 c/s and 7·4±0·1 c/s respectively.