PERFLUOROPHENYL DERIVATIVES OF ELEMENTS .21. POLYFLUOROBENZOBARRELENE COMPLEXES OF IRON TRICARBONYL

Bromine- and methyl-substituted analogues of tetrafluorobenzobicyclo[2.2.2]octatriene (tetrafluorobenzobarrelene) react with triiron dodecacarbonyl to give complexes of the type LFe(CO)3. Competition reactions, Mössbauer chemical shifts and proton NMR evidence all indicate that methyl groups on the olefinic carbon atoms of the ligands decrease the stability of the resulting complexes. The mass spectra of the complexes are discussed; arene-Fe and butadiene"-iron complexes may be intermediates in the fragmentation processes. © 1969."