The 3-fluorophthalic anhydride needed for the synthesis was prepared by oxidation of 2, 3- dimethylfluorobenzene, obtained by decomposition of 2, 3-dimethylbenzenediazonium hexafluorophos-hate.^ As a byproduct in this reaction, 2, 2'-3, 3'-tetramethylbiphenyl was isolated, the identity of which was established by synthesis from the known5 2, 8dimethyliodobenzene. 2, 3-Dimethylfluorobenzene was oxidized to 3-fluorophthalic acid ...
