1.It was established that the two-step organolithium synthesis of 1-alkylnaphthalenes (via 1-naphthyllithium) gives considerably higher yields of the latter than the operation of the reaction by the normal Wurtz-Fittig procedure even when using potassium. The possibility of utilizing secondary and tertiary alkyl halides in this form of the organolithium synthesis of 1-alkyl naphthalenes was demonstrated.2.It was found that in the series of isomeric 1-octylnaphthalenes (synthesized here for the first time) and their decahydro-derivatives, the viscosity increases in proportion to the number of tertiary and (especially) quaternary carbon atoms in the side chain.