The Sandmeyer reaction of 4-(2',2'-dichlorocyclopropyl)aniline (I) first with NaNO2 and acetic acid and then with 33% aqueous H2SO4 at 100 C gives 4-(2',2'-dichlorocyclopropyl)phenol (II), which is then condensed with acetone (A) and CHCl3 by means of NaOH in refluxing acetone.