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Abstract
A detailed analysis of the longitudinal relaxation of the quaternary carbons of the phenyl groups in some diphenylphosphine oxides, and a comparison of the NMR data with X-Ray and theoretical results show that Cq(1) (cf. figure 1) relaxes mainly through an intramolecular DD mechanism and that dipolar interactions with atoms more than 3.5 Å away are unimportant. Residual mechanisms play a major role in the relaxation of Cq(2) and they are identified as CSA and/or SR mechanisms.