Abstract: In this paper, a new method was suggested to separate Dipole-Dipole relaxation, that is called parameter separation method. For a stable rigid molecule, the diffusion coefficient could be calculated from measurement values of secondry and tertiary carbons, which is usually not only for a kinematic research, but also for evaluation of Dipole-Dipole relaxation of quaternary carbons. This procedure shows higher reliability. The result of relaxation study on title mentioned compound shows that parameter separation method is quite efficient for the study of relaxation mechanism for a stable rigid molecule, especially for quaternary carbons.

Key words: ¹³C NMR, Parameter separation method of T₁(DD) for quaternary carbons, T₁ of testosterone propionate