Synthesis of 1,3-Difluoroaromatics in One Pot by Addition of Difluorocarbene from Sodium Chlorodifluoroacetate to 1,2-Substituted Cyclobutenes MorrisonHeather M. RainboltJames E. LewisScott B. 2002 The synthesis of 1,3-difluoro-2,4-diphenylbenzene has been accomplished in one step from 1,2-diphenylcyclobutene using the environmentally benign difluorocarbene precursor sodium chlorodifluoroacetate. In addition, the preparation of the previously unknown compound 1,3-difluoro-2,4-di-<i>n</i>-propylbenzene has been accomplished in one step from 1,2-di-<i>n</i>-propylcyclobutene using Seyferth's reagent (Ph−Hg−CF<sub>3</sub>) and sodium chlorodifluoroacetate.