(1S,4S)-7-(Chloromethyl)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphthalenamine is a reactant in the preparation of 4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-naphthalenamines for treatment of disorders involving regulation of monoamine transporter function.