A concise synthetic methodology for selective deuterium labeling at the ter
tiary centers of the fatty acid dimer, FAD-C44 1 is described. Labeling met
hodology involves three steps and the deuterium is introduced at the tertia
ry carbons selectively by bromination of FAD-C44 followed by reduction with
(NaCNBH3)-H-2 and SnCl2.