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Octylated asphaltenes (OA), and hexane-soluble n-octyl derivatives of asphaltenes, have been used for the determination of more realistic molecular weight averages and molecular weight distributions (MWD) of asphaltenes. Here we report the synthesis and characterization of the Hamaca OA. Both C-13 and elemental analyses show that about five n-octyl groups per 100 carbon atoms are incorporated into...