In a study of antimalarials carried out during the war years in cooperation with the Committee on Medical Research we prepared, 1-cyclopentylnaphthalene (I, R= H) and studied some of its reactions.. No mention of the hydrocarbon or its derivatives was found in the literature other than the report of Pokrovskaya and Sushchik2 that a “ monocyclopentylnaphthalene” fraction of unknown structure was isolated from the Friedel- ...