By the Friedel-Crafts reaction of toluene with oxalyl chloride, three kinds of fluorene derivatives (c, d, e), naphthalene derivative f, fluorenone derivative g, were obtained in addition to 4,4’-dimethyl benzophenone b.. In the compounds (c, d, e, f, g), c shows thermochromism above 135 degrees C in solution, while e emits phosphorescence and f exhibits fluorescence at room temperature in the solid states.