As part of our studies of the synthesis, purification and properties of high molecular weight hydrocarbons, the preparations of several alkyl-anthracenes and-phenanthrenes, together with the corresponding perhydro derivatives, have been completed. They are 9-n- butylanthracene, 9-nbutylperhydroanthracene, 9-n-dodecylanthrlxene, 9-n-dodecy! perhydroanthracene, 9-n-dodecylphenanthrene and 9-n-dodecylperhydrophenanthrene.