The nitration of fluoryl-9-trimethylammonium compounds and the orientation of the products is described. It has been found that the best method of obtaining the unsubstituted ‘Onium salt is from 9-bromofluorene. The 9-substituent does not appear to have any marked influence on the position of new entrant groups but exerts a noticeable one on the activity of the nuclear positions. The converse influence of nuclear substituents on the activity of the 9-position is evident.